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Joseph S. Puleo is the figure most often credited with the “rediscovery” of the modern Solfeggio frequencies. In the narrative that he and Leonard Horowitz popularized, Puleo was not presented as a conventional musicologist but as a practitioner and Bible scholar who in the 1970s used a numerological procedure (often described as a Pythagorean or “number-reduction” method) on a passage in the Old Testament — specifically Numbers chapter 7 — and interpreted the resulting numerical pattern as a code that could be converted into musical tones. That account, and the table of frequencies that grew up around it, were published for a popular audience in Horowitz and Puleo’s book Healing Codes for the Biological Apocalypse (1999) and in later New-Age sources.

What Puleo and Horowitz actually describe doing is straightforward to state, even if the steps involve subjective choices. The first step is a digit-reduction of verse numbers: for the repeated verses in Numbers 7 (for example verse 12, verse 18, verse 24, etc.) each verse number is reduced by adding its digits (12 → 1+2 = 3; 18 → 1+8 = 9; 24 → 2+4 = 6), producing a repeating numeric sequence (commonly reported as 3–9–6, 3–9–6 …). In the book this numeric pattern is shown as a “code” that the authors link to the traditional solmization syllables (Ut–Re–Mi–Fa–Sol–La). The second step is the conversion of those syllables into specific Hertz values: the published table lists Ut = 396 Hz, Re = 417 Hz, Mi = 528 Hz, Fa = 639 Hz, Sol = 741 Hz, La = 852 Hz (and later retellings add 174, 285 and 963 Hz as an expanded set). Those two elements — the digit-reduction pattern in Numbers and the subsequent assignment of fixed Hertz values — are the heart of the Puleo/Horowitz origin story.

It is important to be precise about what is empirical in that chain and what is a decision or interpretation. The digit-reduction procedure simply produces a small repeating set of single digits when applied to a specific set of verse numbers; that operation is transparent and reproducible (you can apply it to any list of numbers and get a pattern). What is not determined by the digits alone is the way those single digits should map to audible frequencies in hertz. Converting a numerological pattern (3, 9, 6, etc.) into a set of audio frequencies requires additional choices that are not specified by the Bible passage itself: a choice of base frequency, an assumption about tuning standard (for example, some proponents point to A=444 Hz rather than the modern A=440 Hz to rationalize why C5 ≈ 528 Hz), and a mapping convention that turns single digits or digit-patterns into three-digit Hertz numbers. Those extra steps are interpretive and vary across proponents; they are not recovered from any continuous historical record of measured pitches in medieval chant. (Out of the Box Ideas)

From a historical-musicological standpoint the Puleo account is therefore a modern construction that borrows medieval terminology (the solfège syllables and the hymn Ut queant laxis, associated with Guido d’Arezzo) but does not demonstrate that fixed Hertz values were used in early chant. Music historians note that the solmization syllables are a pedagogical device from the Middle Ages and that specific pitch standards were not fixed in the way modern listeners understand them; pitches shift with time, region and tuning systems. In short, the claim that Puleo “unearthed” an unchanged, ancient set of measurable frequencies is not supported by mainstream scholarship. (Encyclopedia Britannica)

Finally, a brief note on how this provenance relates to scientific claims: Puleo’s procedure is essentially numerology plus an assumed mapping to acoustic frequencies, and Horowitz’s book packaged those ideas with interpretive claims about healing and biological effects. That origin story explains why the Solfeggio frequencies are culturally compelling (it links scripture, Pythagorean number mysticism and musical language), but it does not constitute empirical evidence that those specific Hertz values have unique biological powers. Experimental or clinical proof would require independent, well-controlled laboratory and clinical studies showing reproducible physiological or molecular effects attributable to those exact frequencies — and such a body of evidence does not yet exist.

(Source : ChatGPT)

Joseph S. Puleo is the figure most often credited in the modern New-Age and sound-healing literature with “rediscovering” what are now called the Solfeggio frequencies. In the accounts that circulate in alternative-health books and websites he is described not as a mainstream musicologist but as a practitioner in the naturopathic/herbalist tradition who, during the 1970s–1990s period, worked with Leonard Horowitz to publicize a set of special tones and their alleged therapeutic meanings. Puleo’s role in the story is primarily that of the person who — by his own account and by Horowitz’s retelling — identified a repeating numerical pattern in a passage of the Bible (Book of Numbers) by applying a Pythagorean or “numeral reduction” method, and then mapped the resulting numbers onto musical tones (later expressed as Hertz values). (Google Livres)

The story as it is usually told is specific and somewhat theatrical: Puleo reportedly had an intuitive or visionary insight that led him to examine Numbers 7:12–83, where, using number-reduction techniques, he found repeating clusters of digits that he interpreted as “codes.” Those code numbers were then converted into the six core tones commonly listed as 396, 417, 528, 639, 741 and 852 Hz; Leonard Horowitz’s later work amplified the narrative, added interpretive layers (for example the now-famous claim that 528 Hz is connected to “DNA repair”), and helped turn the idea into a widely circulated popular book and set of healing claims. The primary vehicle that made Puleo’s version of the Solfeggio story widely known is Horowitz’s book and related materials rather than peer-reviewed scholarship. (healingfrequenciesmusic.com)

What Puleo is said to have “discovered,” therefore, is not an empirically measured ancient tuning preserved in continuous musical practice, but a pattern created by applying a numerological procedure to biblical verse-numbers and then assigning musical frequencies to the resulting numbers. In later New-Age retellings the six-tone set is sometimes expanded to nine tones (adding 174, 285 and 963 Hz), and each frequency is given a specific psychological or physiological meaning; those attributions were popularized after Puleo’s initial work, especially by Horowitz and by subsequent practitioners in the sound-healing community. (MindVibrations)

Scholarly and music-historical reaction has been skeptical. Musicologists note that the medieval solfège syllables (Ut–Re–Mi etc.) — which are the genuine historical element that the “Solfeggio” story borrows its name from — were a pedagogical device from the Middle Ages and do not carry documented, fixed Hertz values; the claim that a single discrete set of measurable frequencies was used unchanged in ancient or medieval liturgy is not supported by mainstream historical evidence. Critics also point out methodological problems with the numerology route (chapter and verse numbers were added to biblical texts many centuries after the chants were composed, and converting verse numbers into modern Hertz requires multiple arbitrary choices). In short, Puleo’s “discovery” sits squarely inside a modern, numerology-based revival and was popularized through alternative publishing rather than established musicology or biomedical research. (RationalWiki)

Finally, it’s important to separate provenance from proof. Puleo’s account explains how a particular sequence of numbers came to be presented as frequencies and why those frequencies carry the symbolic meanings they do within the sound-healing community. It does not, by itself, provide experimental or clinical evidence that those frequencies have unique healing effects. Claims that particular Solfeggio tones (for example 528 Hz) “repair DNA” or directly heal tissues rest on later speculative interpretations and selective citations rather than on independently replicated, peer-reviewed biomedical experiments. For that reason, historians of music and practicing biomedical scientists treat Puleo’s narrative as a cultural origin story for a modern healing practice, not as scientific proof that the named Hertz values have the specific biological powers sometimes attributed to them. (Google Livres)

(Source : ChatGPT)

Below is a concise, historically-framed, science-focused account of where the “Solfeggio frequencies” idea came from and what the peer-reviewed / published experimental literature actually looks like today. For each research item I give the study title (or how it is published), the principal investigators named on the paper, the year(s) of the work and the experimental context, and a short appraisal of strengths and limitations.

The musical and documentary origins
The modern “Solfeggio” story mixes two different threads: (a) the genuine medieval origin of the solfège syllables used to teach pitch (Ut–Re–Mi etc.), which are associated with the 11th-century music theorist Guido d’Arezzo and the Latin hymn “Ut queant laxis”; and (b) a much later 20th-century construction that assigns particular hertz values (for example 396, 417, 528, 639 Hz and others) and ascribes to them special healing virtues. The first thread (Guido and the hymn) is a well-documented part of Western music history and explains why the syllables are called “solfège.” The second thread — the modern list of numerical frequencies and their described therapeutic powers — was popularized in the 1970s and later by a small number of naturopathic and popular-press authors rather than by continuous musicological or medical tradition. That modern origin is usually traced to Dr. Joseph Puleo (1970s) and later amplified by Leonard Horowitz in books and popular media; historical claims that the exact numeric frequencies were used unchanged in ancient chants are not supported by mainstream musicology. (Wikipédia)

Early laboratory claims linking sound and DNA / cells
Beginning in the late 20th century a few laboratory researchers published provocative, small-scale reports suggesting that very specific sound exposures or “intention” could alter measurable properties of DNA or cellular preparations. For example cell-biologist Glen Rein published exploratory experiments in the 1990s examining whether human intention or particular audio stimuli altered DNA conformation or related measures; this line of work appears in venues such as the Journal of Scientific Exploration and the HeartMath research library (work that is interesting but controversial and not widely reproduced in mainstream molecular biology). These early in-vitro studies seeded interest among practitioners who later connected their findings to particular audible frequencies such as 528 Hz. The Rein work is historically important for the community that promotes sound healing, but it is not the kind of independently replicated, mechanism-clearing research that establishes a causal molecular pathway for a named audible frequency to “repair DNA.” (HeartMath Institute)

The 1990s–2000s popularization (Puleo / Horowitz)
In the 1970s and later, Joseph Puleo (a physician/naturopath) “rediscovered” a sequence of six tones using a numerology method applied to the Latin hymn lines; Leonard Horowitz expanded and publicized these ideas in books and on the alternative-health circuit, adding claims (for example about 528 Hz and “DNA repair”) that were widely reproduced in the New-Age and sound-healing communities. These publications are primarily popular and speculative rather than controlled scientific reports; they are the origin of the modern “528 Hz = love / DNA repair” meme that spread widely on audio streaming platforms and social media. (healingfrequenciesmusic.com)

Recent experimental studies (2010s — present): what was done, by whom, and what they found
As public interest grew, several laboratory and small human studies explicitly tested biological or physiological responses to music or sound tuned to frequencies associated with the Solfeggio set. Below I list the most frequently cited published experiments, with the study name or publication, authors, year, experimental context and a brief appraisal.

1. “The Effects of 528 Hz Sound Wave to Reduce Cell Death in Human Astrocyte Primary Cell Culture Treated with Ethanol” — T. Babayi & G.H. Riazi (published 2017, J Addict Res Ther / OMICS).
   This in-vitro paper exposed human astrocyte primary cultures (cells) to 528 Hz sound during ethanol toxicity experiments and reported that 528 Hz exposure reduced cell death (reported ≈20% increase in viability versus ethanol alone) and decreased reactive oxygen species (ROS) production in the culture system. The work is cell-culture (not in vivo) and was published in an open-access journal; it is hypothesis-generating but limited by in-vitro conditions, absence of independent replications and potential concerns about journal quality. The paper is often cited by proponents as evidence that 528 Hz has direct cellular protective effects, but the result requires independent replication and mechanistic follow-up to be compelling for medical claims. (Scribd)

2. “Effect of 528 Hz Music on the Endocrine System and Autonomic Nervous System” — K. Akimoto, A. Hu, T. Yamaguchi, H. Kobayashi (published 2018, Health (SCIRP)).
   This study tested healthy human volunteers (small sample) exposed to short (five-minute) segments of music tuned so that a 528 Hz note was present (the authors contrasted “528 Hz music” to standard 440 Hz music). They measured salivary stress biomarkers (cortisol, chromogranin A, oxytocin), ECG autonomic measures, and mood questionnaires. The authors reported that five minutes of 528 Hz music reduced salivary cortisol and subjective tension and altered heart-rate variability measures relative to the control condition. This is a small human physiological study: interesting, but limited by the tiny sample sizes, short exposure times, and questions about blinding and generalizability. It suggests that particular tunings can influence stress markers in short experiments, but it does not demonstrate clinical outcomes or biological “repair.” (SCIRP)

3. “Influence of various intensities of 528 Hz sound-wave in production of testosterone in rat’s brain and analysis of behavioral changes” — T. Babayi Daylari et al. (published 2019, Genes & Genomics; Epub 2018).
   In an animal model (rats) this team (affiliated with the University of Tehran) exposed animals to high-intensity 528 Hz sound and reported increases in brain testosterone synthesis markers (changes in StAR and SF-1 gene expression), reduced markers of reactive oxygen species in brain tissue and reductions in anxiety-like behaviours after prolonged exposures at high sound pressure levels. This is a peer-reviewed, PubMed-indexed animal study that used molecular and behavioral endpoints; it provides a stronger mechanistic signal than a single in-vitro paper but also raises immediate questions about intensity (many of these effects occurred at high decibels), species differences, and replicability. Translating such findings to safe, effective human therapies would require careful dose-response, replication and safety work. (PubMed)

4. Other small human and in-vitro reports and a recent review (2017–2024).
   A small body of scattered studies (some in specialized or open-access venues) report modest anxiolytic or autonomic-modulation effects of music containing 528 Hz or other Solfeggio-labelled tones; several in-vitro experiments (including the Babayi work above) report frequency-dependent changes in cell viability or ROS under particular conditions. In 2023 a literature review by X. Yang and colleagues synthesized studies on chanting and Solfeggio frequencies and concluded that while some physiological and EEG/mood changes have been reported, the literature is sparse, heterogeneous and in many cases under-powered; the authors recommended larger, better-controlled trials. Across the board the pattern is: intriguing pilot results, many single-lab reports, and a lack of large-scale randomized clinical trials or independent, multi-laboratory replications. (ResearchGate)

Assessment of the evidence and methodological concerns
Taken together, the peer-reviewed literature for specific Solfeggio frequencies (and especially for the headline claim “528 Hz repairs DNA”) is preliminary and mixed. The most scientifically robust findings in the broader field of music and sound research are consistent and uncontroversial: music and controlled sound exposure can alter mood, autonomic balance (heart-rate variability), stress hormones and subjective well-being — effects that are reproducible across many musical styles and experimental designs. What is not established is the stronger, mechanistic claim that a single audible frequency (e.g., 528 Hz) uniquely and reproducibly creates molecular repairs (DNA strand repair) in humans. Several reasons for caution are:

• Small sample sizes and short exposures in human studies; often no blinding or sham control. • Many relevant publications appear in journals or outlets with variable editorial standards (open-access titles that have been criticized as predatory), which increases the need for independent replication in higher-tier journals. • Some promising in-vitro or animal findings require very high sound intensities or special experimental conditions that do not translate directly into safe, everyday human exposure. • Early in-vitro and “intentionality” studies (for example Glen Rein’s work) are suggestive but controversial and not part of an established, replicated evidence base for therapeutic DNA repair. For balanced summaries and skeptical appraisals, see critical overviews and skeptical reviews that emphasize the lack of robust clinical proof for the extraordinary claims. (HowStuffWorks)

What reasonable clinicians and researchers conclude today
Responsible scientists say: (a) there is good evidence that music and sound therapy can be clinically useful for stress reduction, mood, pain modulation and some rehabilitation contexts; (b) the specific Solfeggio frequency claims (e.g., that a single frequency reliably “repairs DNA” or cures disease) are not supported by the kind of large, well-controlled, independently replicated clinical or molecular studies needed to make medical claims; and (c) some recently published small animal and cell studies provide hypotheses worth following up with better-designed experiments (dose-finding, blinded randomized human trials, independent replication, safety work). In short: the field is interesting and active at the pilot stage, but it is not yet at the level where one can confidently prescribe a named Hz value as a medical therapy. (PMC)

(Source : ChatGPT)

Listening to music tuned to particular tones (including the so-called “Solfeggio” tones) can change mood, stress markers, heart-rate variability and some measurable physiological variables — but the extraordinary claims often made for Solfeggio (for example that a specific frequency “repairs DNA”) are not supported by robust, reproducible clinical evidence. There are a few small studies and some plausible biological mechanisms, but the evidence is preliminary and far from proof.

A bit more detail, from a scientific point of view:

The Solfeggio story and the claims people attach to it are mostly modern. The popular “Solfeggio frequencies” narrative — a small set of discrete hertz values (e.g. 396, 417, 528, 639 Hz, etc.) with very specific healing powers — was popularized in the 1970s and later by a handful of authors. Historical claims that these exact tones were a lost ancient scale are disputed by music historians; the modern story mixes numerology and selective references rather than continuous historical musicological evidence. (themindorchestra.com)

Why some scientists take the idea seriously enough to study it at all is because there are plausible, testable ways sound can affect biological systems. At the whole-organism level, music reliably affects the nervous system: it can shift mood, modulate stress hormones, change autonomic balance (heart-rate and heart-rate variability), and alter brain rhythms through neural entrainment. At the cellular level, cells do respond to mechanical forces (mechanotransduction) and high-intensity acoustic stimulation (notably ultrasound) can change cellular signaling; there is active research into how audible and near-audible vibrations influence gene expression, calcium signaling and cytoskeleton structure. Those mechanisms make it biologically plausible that sound can produce physiological effects — but plausibility is not the same as proof that a single named frequency has a unique, powerful healing action. (PMC)

What the studies actually say (summary of the best-documented findings): some small, often exploratory studies report measurable changes when people or animals are exposed to specific frequencies. For example, there are small human experiments that reported changes in endocrine and autonomic markers after listening to music tuned to 528 Hz, and animal/cell studies that found frequency-dependent effects on hormones or behavior under particular conditions. These are interesting laboratory results but typically involve very small sample sizes, special experimental setups (sometimes high sound intensities), or animal models — which limits how confidently we can translate them into clinical recommendations for people. In other words: there are preliminary signals, not definitive proof. (SCIRP)

What about the big claims (for example “528 Hz repairs DNA”)? Mainstream molecular biology has no accepted mechanism or reproducible demonstration that listening to a single audible frequency will repair human DNA in vivo. Extraordinary claims require extraordinary, well-controlled evidence (large randomized controlled trials, replication across independent labs, clear molecular markers measured blind, etc.), and that kind of evidence is not available. Reviews and skeptical analyses conclude that while music and sound therapies can be beneficial for stress, mood and some clinical symptoms (for example some forms of tinnitus or anxiety), the specific Solfeggio frequency claims outstrip the available data. (HowStuffWorks)

Practical takeaways:
• If you find Solfeggio music relaxing, reducing your anxiety, or helpful for sleep, that is a valid, personal benefit — and it’s consistent with what we know about music and mood regulation.
• If someone claims a specific Solfeggio tone is a medical cure (DNA repair, guaranteed disease reversal), treat that claim skeptically: the current literature does not support such high-impact claims.
• For clinical problems (pain, chronic illness, mental-health conditions, tinnitus), sound and music therapy can be a useful adjunct but should not replace evidence-based medical care; discuss such approaches with your clinician.

(Source : ChatGPT) (Image : BingAI)

La zonuline est une molécule qui contrôle l’étanchéité de l’intestin, par le biais de l’ouverture des jonctions serrées qui unissent les cellules de sa paroi. Produite en excès dans certaines circonstances, elle peut causer le passage de composés indésirables dans l’organisme, et ainsi contribuer à l’émergence de maladies chroniques. 

Qu’est-ce que la zonuline ?

La zonuline est une protéine produite par les entérocytes, les cellules qui composent majoritairement la paroi de l’intestin. Elle agit sur les jonctions serrées, des structures situées entre les cellules de la paroi intestinale qui régulent le passage des substances de l’intestin vers la circulation sanguine, autrement dit vers l’intérieur de l’organisme. La zonuline a été identifiée il y a une vingtaine d’années grâce à son action semblable à celle d’une toxine bactérienne, la toxine Zot (Zonula Occludens Toxin) produite par Vibrio cholera, la bactérie responsable du choléra.

Le mécanisme d’action de la zonuline

Lorsque la zonuline est sécrétée, elle active deux récepteurs présents au niveau des entérocytes (PAR2 et EGFR). Elle déclenche alors une cascade de réactions à l’intérieur de la cellule, qui modifie son architecture et provoque le désassemblage de la jonction serrée. À la manière d’un maillage qui se détend, la perméabilité de l’intestin augmente. L’action de la zonuline est réversible et seulement temporaire. En raison de son rapport direct avec la cohésion des jonctions serrées, la zonuline est considérée comme un biomarqueur de la perméabilité intestinale. Son dosage peut être effectué dans le sang ou dans les selles.

La zonuline, une molécule singulière

L’hémoglobine est la protéine qui assure le transport de l’oxygène au sein des globules rouges. Lorsqu’elle se trouve sous sa forme libre, elle exerce par ailleurs une action oxydante, agressive pour les cellules. L’ haptoglobuline-2, formé à la partir de la zonuline, est capable de neutraliser cette forme libre de l’hémoglobine. La zonuline est atypique dans la mesure où son effet est totalement différent de celui exercé par le composé auquel elle donne naissance.

Qu’est-ce qui provoque la sécrétion de zonuline ?

Parmi les facteurs conduisant à la production de zonuline, deux prédominent : la présence d’une quantité importante de bactéries dans l’intestin grêle, et la consommation de gluten.

La production de zonuline en réponse à une invasion microbienne

En situation normale, l’intestin grêle ne comporte pas de bactéries, contrairement au côlon qui héberge une diversité microbienne riche et variée : le microbiote intestinal.  Une étude réalisée en laboratoire a montré que, lorsque l’intestin grêle est exposé à des bactéries, il produit de la zonuline et sa perméabilité augmente. Il se comporte de la même manière face à des bactéries alliées du microbiote ou à des bactéries pathogènes, et même en présence de bactéries tuées par un traitement antibiotique. Ce processus est propre à l’intestin grêle et ne se produit pas dans le côlon. Il s’agit d’un mécanisme de défense consécutif à la colonisation de l’intestin grêle par des bactéries qui n’ont rien à y faire. En permettant l’ouverture des jonctions serrées, la zonuline provoque un afflux d’eau dans l’intestin qui balaie les bactéries.

Le gluten perturbe la production de zonuline

De nombreuses céréales, comme le blé, le seigle ou l’orge, contiennent des prolamines, qui sont les protéines nocives du gluten. Ces dernières viennent se lier à des récepteurs présents à la surface des entérocytes, les récepteurs CXCR3, et provoquent la production de zonuline, qui va à son tour déclencher l’ouvertures des jonctions serrées.

Le relargage de zonuline en cas de contact avec les prolamines suggère que l’organisme les perçoit de la même manière que s’il s’agissait d’un constituant dangereux provenant d’un microbe. Cette méprise de l’organisme est donc à l’origine de la sensibilité au gluten de bon nombre de personnes. 

Gluten et zonuline : le cas de la maladie cœliaque

Les personnes atteintes de maladie cœliaque présentent une quantité accrue de récepteurs CXCR3. Ceci expliquerait pourquoi les tissus intestinaux prélevés chez des malades cœliaques lors de biopsie produisent plus de zonuline lorsqu’ils sont exposés aux prolamines, et en particulier à la gliadine du blé, que les tissus issus de personnes non concernées par la maladie.

L’augmentation de la perméabilité intestinale permet à la gliadine de traverser l’épithélium en empruntant les jonctions serrées. La gliadine va alors stimuler la production de messagers pro-inflammatoires par les macrophages présents dans la sous-muqueuse de l’intestin grêle. Ce phénomène entraîne des réactions immunitaires qui finissent par se retourner contre les propres constituants de l’organisme, à l’origine des symptômes qui se manifestent chez les malades cœliaques.  

Les perturbateurs endocriniens augmentent la perméabilité intestinale

D’autres substances peuvent promouvoir la formation de zonuline. Une étude chez la souris a montré que le bisphénol A, un perturbateur endocrinien, conduit à une élévation de la quantité de zonuline dans le sang et la muqueuse du côlon, augmentant ainsi la perméabilité intestinale.

Quelles sont les maladies associées à un excès de zonuline ?

Le mécanisme impliquant la régulation de l’ouverture des jonctions serrées par la zonuline est un système de défense mis en place par notre organisme. Toutefois, ce mécanisme peut entraîner des conséquences délétères lorsqu’il est exagérément actif. En augmentant la perméabilité de l’intestin, la zonuline permet à des substances qui y sont présentes  – des fragments d’aliments, des composés bactériens… – de franchir la barrière et de déclencher des réactions anormales, comme on l’a vu avec la gliadine.  Elle aurait ainsi sa part de responsabilité dans la survenue de nombreuses maladies auto-immunes, non seulement la maladie cœliaque mais également la spondylarthrite ankylosante, la maladie de Crohn, la polyarthrite rhumatoïde, le lupus érythémateux disséminé, le diabète de type 1, ou encore la sclérose en plaque. D’autres pathologies sont associées à un taux élevé de zonuline. C’est le cas de  maladies affectant la sphère cérébrale, comme la schizophrénie par exemple, ou des cancers tels que le cancer du cerveau, du sein, de l’ovaire, du pancréas, ou encore l’adénocarcinome du poumon.

La zonuline serait-elle une médiatrice de l’axe intestin-cerveau ?

Si la zonuline agit au niveau des jonctions serrées de l’intestin grêle, son action ne se limite pas pour autant à la sphère digestive. Des chercheurs américains ont en effet montré que la zonuline nuit à l’étanchéité de la barrière hémato-encéphalique, dont le rôle est de protéger le cerveau. Celle-ci est constituée de cellules endothéliales qui possèdent, comme celles de l’intestin, les deux types de récepteurs nécessaires à l’action de la zonuline. Ce défaut d’étanchéité peut favoriser la survenue de phénomènes inflammatoires au niveau du cerveau et altérer le précieux organe.

Zonuline et sclérose en plaque

La sclérose en plaque, par exemple, fait partie des maladies auto-immunes où les patients présentent un niveau sanguin élevé de zonuline, ainsi qu’une défaillance du fonctionnement de la barrière hémato-encéphalique qui précède l’apparition de lésions au niveau du cerveau.

La zonuline est impliquée dans de nombreux troubles psychiques

Les enfants atteints de troubles de l’attention avec hyperactivité présentent également des niveaux sanguins élevés de zonuline, par rapport aux enfants non concernés par ce trouble. Le taux de zonuline est associé à l’intensité de leurs symptômes et aux difficultés dans le fonctionnement social. De nombreux troubles psychiques, des maladies neurodégénératives à la dépression en passant par l’autisme, pourraient impliquer des défaillances de l’axe intestin-cerveau. Une meilleure compréhension de ces liens pourrait ouvrir la voie à un nouvel éventail de pistes thérapeutiques.

(Source : JulienVenesson.fr)

Here’s a clear, patient-friendly overview of the main tongue features used in classical TCM and what each feature traditionally indicates, written as a continuous narrative.

Practitioners begin with the tongue’s basic color. A normal healthy tongue is typically pale red; when the body’s Qi or Blood is weak, the tongue tends to become pale and may appear swollen or have teeth-marks at the edges, signs that TCM calls Spleen-Qi deficiency or Blood deficiency. A very red or deep red tongue usually signals Heat—either excess Heat in the interior or Yin deficiency with relative Heat—so clinicians interpret a bright red tongue as an inflammatory or hyperactive pattern. A bluish or purplish tongue is read as Blood stasis or poor circulation, suggesting stagnation or chronic pathology in TCM terms.

Closely observed after color is the tongue coating, which TCM treats as especially informative about the state of the stomach and the presence of Dampness or pathogenic Heat. A thin, white coating is considered normal; a thick, greasy, yellow coating points toward Damp-Heat or pathogenic Dampness with Heat, often associated with sticky, foul-smelling stools or heavy sensations. A thick, white, greasy coating is more Damp than Heat, and a peeled or absent coating (a glossy, shiny tongue surface) suggests depletion of stomach fluids or Yin deficiency—classical signs that the body’s nourishing fluids are reduced.

Tongue shape and size also carry diagnostic weight. A swollen, puffy tongue that appears bloated is commonly read as Spleen-Qi deficiency with Damp accumulation; conversely, a thin, narrow tongue often points to Blood or Yin deficiency, reflecting long-term depletion. Specific structural features like teeth-marks at the border are another signal of Spleen weakness, while deep cracks on the tongue’s surface can be associated with chronic Yin or fluid deficiency, and finer, networked cracks may indicate Blood stasis.

Moisture and texture round out the picture. A moist, supple tongue usually indicates adequate body fluids, whereas a dry tongue suggests Yin or fluid deficiency or interior Heat consuming fluids. Excessive wetness or a slippery, overly moist tongue is classically interpreted as Dampness or retained phlegm fluids. Practitioners also note movement and coating adhesion: a coating that scrapes off easily versus one that clings more tenaciously can change the interpretation between recent, superficial invasion and deeper, entrenched pathogenic factors.

Beyond these primary signs, clinicians integrate secondary clues such as the tongue’s tip or root: the tip is associated with the Heart and Shen (spirit), so red or swollen changes there may indicate emotional agitation or Heart-related Heat, while the root reflects Kidney and lower-jiao conditions. All of these tongue observations are never read in isolation; a TCM diagnosis arises from combining the tongue’s findings with the pulse, the patient’s history, symptoms, and overall appearance to form a pattern that guides individualized treatment.

Finally, it’s important to remember that many non-disease factors—recent eating, oral hygiene, smoking, medications, and even time of day—can alter tongue appearance, so a skilled practitioner interprets tongue features in context and often examines the tongue more than once. Modern research is beginning to map some of these classical signs to microbiome and biochemical differences on the tongue surface, but in practice tongue diagnosis remains a traditional art integrated with broader clinical reasoning rather than a single definitive test.

(Source : ChatGPT) (Image : LiaAndrews.Wordpress)

(...) The tongue shows conditions of Yin deficiency and Empty Heat clearly. It is important to understand that, although Empty Heat derives from Yin deficiency, it takes time for it to develop. Therefore, a patient may display all the signs of Yin deficiency on the tongue for several years without developing Empty Heat and the tongue shows this clearly by lacking a coating (Yin deficiency) but being of a normal colour (no Empty Heat). In fact, Yin deficiency manifests on the tongue with a lack of coating; therefore, a tongue without coating but of a normal body colour indicates Yin deficiency without Empty Heat. As Yin deficiency aggravates with time, Empty Heat may develop and this turns the tongue red: therefore Empty Heat on the tongue is manifested by a red body colour together with the absence of coating. One often hears that “in Yin deficiency the tongue is red” (a statement that is tempting to make since “in Yang deficiency the tongue is pale”). This is not so: in Yin deficiency, the tongue lacks a coating; in Empty Heat, the tongue lacks a coating and it is red. A tongue without coating indicates Yin deficiency first and foremost of the Stomach: in addition, it may also indicate Yin deficiency of the Kidneys, Liver or Heart. That Yin deficiency can occur without Empty Heat is demonstrated by tongue diagnosis as many patients have a tongue that lacks a coating (indicating Yin deficiency) but is not red. Yin deficiency and Empty Heat are not formed in a short space of time: it takes years from them to develop (the only exception is the Yin deficiency and Empty Heat that may form in an acute way during an invasion of Wind-Heat with Heat penetrating into the Interior). The tongue shows clearly not only the present condition but also the stage it is at: it therefore also shows where it is developing from and what it may lead to. Empty Heat may develop at any of these stages but it is more likely to develop at the third when the tongue has no coating and it is red.

(Source :  Giovanni Maciocia)

The practice of reading the tongue as a window into a person’s internal health has roots that reach deep into the earliest layers of Chinese medicine, where careful visual observation of the body was already a central diagnostic skill. Classical texts such as the Huangdi Neijing (the Yellow Emperor’s Inner Classic), compiled and edited over the late Warring States through early Han period, contain passages that link the appearance of the tongue to internal organs and disease, and these passages established tongue inspection as one of the fundamental observational tools in the physician’s toolkit. (PMC, Yo San University)

Although the seeds of tongue diagnosis appear in these very ancient writings, the method was not a fixed, monographic system from the start; it evolved gradually over centuries. From simple remarks about color, coating and moisture in early works, the technique became increasingly systematic between the Han and Song dynasties as clinicians accumulated clinical experience and wrote case histories and manuals. Scholars who have examined the historical record argue that the first devoted monographs and more formalized systems of tongue inspection appeared later — especially during the medieval period of Chinese medicine — when a need for efficient, observable signs prompted clinicians to codify what to look for and how to interpret it. (PubMed, UCL Discovery)

Two practical forces helped shape the prominence of tongue diagnosis. First, the tongue is easily inspected without disrobing or invasive testing, so it became a rapid, bedside indicator of patterns such as Heat, Cold, Dampness and Blood or Qi deficiency that form the basis of TCM syndrome differentiation. Second, historical circumstances—reports note that during epidemic periods physicians sometimes minimized contact with patients—made a non-contact, visual method especially useful, encouraging clinicians to refine tongue observation as a clinical shortcut that still conveyed rich diagnostic information. (UCL Discovery, PubMed)

By the late imperial period, tongue inspection had been fully integrated into the “four examinations” (looking, listening/smelling, asking, palpating) and was taught as a skilled art: practitioners learned to read subtle variations in body, color, coating, shape and moisture and to interpret these signs within the larger pattern of pulse, symptoms and history. That skill remains a hallmark of classical TCM education and clinical practice: the tongue provides immediate, visible clues that are weighed together with the pulse and the patient’s story to arrive at a pattern-based diagnosis. (PMC)

In recent decades scholars and clinicians have begun to examine tongue diagnosis through modern scientific lenses, asking whether features like coating color or thickness correspond with measurable phenomena such as microbiome composition or local inflammation. Early molecular and microbiome studies have found associations between tongue coating types and particular microbial communities or gastric conditions, suggesting that some ancient observations may map onto biological signals that modern tools can quantify. At the same time, rigorous historical scholarship emphasizes that tongue diagnosis remained, and remains, a clinical art embedded in a broader interpretive system rather than a stand-alone biomedical test. (Nature, PubMed)

Taken together, the history of tongue diagnosis in Chinese medicine is a story of slow elaboration: an empirical visual habit noted in foundational texts grew into a codified diagnostic method through centuries of clinical practice, social need, and theoretical synthesis, and today it sits at the intersection of traditional pattern-based reasoning and emerging biomedical research. If you’d like, I can follow this with a brief overview of the specific tongue features (color, coating, shape, moisture) and what classical TCM theory associates them with, or point to some of the key historical and modern studies for further reading.

(...)  In recent decades researchers have begun to test the centuries-old practice of tongue diagnosis with modern laboratory tools, and the results so far suggest that some classical observations do map onto measurable biological signals rather than being purely subjective impressions. Early molecular studies showed that the microbial community living in the tongue coating differs between people with chronic gastritis and healthy controls, and investigators proposed that the “tongue-coating microbiome” could serve as a noninvasive biomarker for certain gastric diseases. (PMC)

Those initial 16S rRNA sequencing studies were soon followed by deeper “-omics” work. Metaproteomics and metagenomic studies have characterized the proteins and species present in the tongue biofilm and found patterns that distinguish patients with gastric cancer or precancerous lesions from controls; similarly, metabolomics studies have detected changes in small-molecule profiles on the tongue surface (notably shifts in lipid and other metabolite classes) that correlate with chronic gastritis and other gastric pathology. Together these approaches show that the visible coating on the tongue is a living biofilm whose species composition and chemical output can reflect processes occurring in the stomach and beyond. (BioMed Central, Nature)

At the same time, clinicians and microbiologists have documented specific clinical drivers of those tongue changes. For example, infection with Helicobacter pylori alters the oral and tongue-coating microbiota, and eradication of H. pylori can shift those communities again, which both strengthens the biological plausibility of tongue signs and highlights an important potential confounder for studies that try to link coating appearance directly to systemic disease. (BioMed Central)

Parallel to laboratory work, computer science has entered the field. Over the last five years many groups have developed automated imaging systems and machine-learning models that extract objective features from tongue photos—color metrics, coating thickness, shape and texture—and some models show promising classification performance for syndromes or certain diseases in study cohorts. These digital tools aim to reduce observer variability and to provide standardized, reproducible measurements that can be correlated with microbiome or metabolomic readouts. (PMC)

Despite these advances, important caveats remain. Most studies to date are relatively small, often from single centers, and results can vary with oral hygiene, recent food intake, antibiotics, smoking, age and the method used to capture images or collect coating samples. There is not yet a universally accepted protocol for photographing the tongue, collecting coating material, or analyzing the multi-omic data, which makes cross-study comparison and clinical validation difficult. For that reason, while tongue-based biomarkers are an exciting research avenue, they are not yet established diagnostic tools in mainstream medicine. (Frontiers, PMC)

Looking ahead, the most useful studies will combine standardized digital imaging, rigorous sample collection, and multi-omics (microbiome, metaproteome, metabolome) in large, well-characterized patient cohorts, ideally with longitudinal follow-up and careful recording of confounders like H. pylori status and oral hygiene. If those methodological hurdles are solved, tongue analysis could become a low-cost screening or monitoring adjunct—for example, flagging people who need gastroscopy or helping to monitor disease progression or response to therapy—but until then the best interpretation of tongue signs remains as one piece of clinical information to be integrated with other findings. (BioMed Central, PMC)

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In Traditional Chinese Medicine, plants and other botanical substances are chosen not to “fix” a single labelled disease but to correct the underlying pattern — in the case of what Western medicine calls “leaky gut,” that usually means strengthening the Spleen’s holding function, drying or transforming Dampness, soothing disrupted Liver–Spleen interactions, and, where present, clearing Damp-Heat. Practitioners therefore commonly use a handful of well-known herbs and multi-herb formulas aimed at those goals: Astragalus root (huang qi) is a primary qi-tonic used to reinforce the surface, support immune strength, and is one of the herbs most often cited for improving intestinal barrier function in laboratory and animal studies; Atractylodes macrocephala (bai zhu) and Poria (fu ling) are classic spleen-strengthening and damp-resolving herbs that help reduce bloating and loose stools and “dry” the pathological dampness that TCM links to mucousy or loose stools; aromatic herbs such as Cangzhu and Chenpi are used to move stagnant middle-jiao qi and help transform dampness; and when there is a hotter, inflammatory presentation clinicians choose bitter-cool herbs such as Scutellaria (huang qin) or Coptis (huang lian) to clear Damp-Heat. Several traditional formulas built from these building blocks — for example Shenling Baizhu San (used to tonify the spleen and resolve dampness) and Si-Shen-Wan (used historically to astringe the intestines and stop chronic diarrhea) — are widely used in clinical practice and have growing preclinical and clinical literature supporting their use for chronic diarrhea, dysbiosis-related symptoms, and indicators of impaired barrier function. (PMC, Frontiers)

Mechanistically, modern research suggests these herbs and formulas may help in several ways relevant to “leaky gut”: by reducing mucosal inflammation, by modulating signaling pathways that control tight junctions, and by shifting the composition and activity of the gut microbiota toward a more protective community. For example, extracts of Astragalus have been reported to improve markers of intestinal barrier integrity in animal and in vitro studies, while compound formulas that combine heat-clearing and damp-transforming herbs have shown benefits in models of mucosal injury; more broadly, reviews of TCM’s effects on the gut emphasize microbiome modulation as a common pathway by which multi-herb prescriptions exert benefit. (Frontiers)

It’s important to stress that TCM treatment is individualized: the same symptom (loose stools, bloating, fatigue) might be treated with very different herbs if a practitioner diagnoses Spleen-Qi deficiency versus Damp-Heat versus Liver-Qi stagnation overacting on the Spleen. Likewise, while there is encouraging preclinical and an increasing number of clinical studies for specific formulas, the evidence base is still developing and quality varies by preparation, dose, and study design. For safety, herbs can interact with prescription medicines and may be contraindicated in certain conditions (for example, some cool or bitter herbs are not used when a patient is very weak and cold), so it’s best to consult a licensed TCM practitioner or medical professional before starting any botanical regimen rather than self-prescribing. (PMC)

Four Examinations, One Diagnosis: How TCM Differentiates Gut Patterns :

A TCM practitioner figures out whether a patient has Spleen-Qi deficiency, Damp-Heat, or Liver-Qi stagnation overacting on the Spleen by putting together the whole clinical picture using the “four examinations” (looking, listening/smelling, asking, and palpating). These methods are used as an integrated puzzle: no single sign proves a pattern, but a cluster of tongue features, pulse qualities, symptom history and the patient’s overall appearance and story point the practitioner toward one diagnosis or another.

When the practitioner looks, the tongue is a central clue. A pale, swollen tongue with teeth-marks and a thin, white coating often accompanies Spleen-Qi deficiency, whereas a redder tongue with a yellow, greasy coating suggests Damp-Heat. Liver-Qi stagnation may show as a normal or slightly red tongue often with a thin coating and redder sides. The practitioner also listens to the voice and notes breath or body odors; a weak, soft voice fits Spleen deficiency and a sticky, foul odor may accompany Damp-Heat.

When asking, the practitioner gathers the symptom pattern and history: Spleen-Qi deficiency usually presents as chronic fatigue, poor appetite, bloating after meals, loose stools, easy bruising or edema, and worse symptoms with overwork or heavy meals. Damp-Heat produces feelings of heaviness, sticky or greasy stools often with a foul smell, abdominal pain worse with heat, possible low-grade fever or thirst for cold drinks, and sometimes urinary symptoms or skin eruptions. Liver-Qi stagnation is suggested when emotional stress, irritability or mood swings clearly trigger digestive symptoms; patients commonly report abdominal distension, a sensation of constraint that moves around, alternating constipation and loose stools, and symptoms that change with mood or the menstrual cycle.

Pulse palpation is another major tool. A weak, empty or soggy pulse supports Spleen-Qi deficiency. A rapid, slippery pulse often with strength can indicate Damp-Heat. A wiry, tight pulse is classically associated with Liver-Qi stagnation and especially with patterns where Liver activity disturbs the Spleen. The practitioner reads these pulses in context rather than as isolated facts.

Finally, a good TCM clinician integrates these signs with the course of illness, precipitating factors and response to previous treatments. They will also rule out or document any biomedical causes that require conventional management (for example infections, celiac disease, IBD or medication effects) and may use that information to refine the TCM pattern. In practice many patients have mixed patterns (for example Spleen-Qi deficiency with secondary Damp accumulation), and the treatment plan is prioritized to address the most pressing pattern first while monitoring how symptoms and the tongue/pulse change over time. For anyone considering care, the safest route is to consult a licensed TCM practitioner who will do a full intake and, when appropriate, coordinate with your medical doctor.

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From a Traditional Chinese Medicine perspective, what Western medicine calls “leaky gut syndrome” would not be seen as a single disease but as a set of possible energetic imbalances that allow the body’s defenses and fluids to “escape” the proper channels. In TCM language the digestive system is governed primarily by the Spleen (and its partner, the Stomach). When the Spleen’s function of transforming food into Qi and fluids is weakened, it cannot “hold” things in place. That weakened or “sinking” Spleen Qi is often used to explain chronic loose stools, fatigue, bloating, poor nutrient absorption and a general sense that the body’s barrier has become porous. In other cases, excess Dampness—the accumulation of sticky, turbid fluids—overwhelms the Spleen and clogs the middle jiao (the digestive center), producing heaviness, mucus, loose stools and a sense of internal stickiness that TCM would liken to the pathological side of a leaky barrier.

TCM practitioners also look for whether Dampness has become Heat (damp-heat), a pattern more inflammatory and “hot” in character—signs might include burning sensations, foul stools, abdominal pain, or systemic signs of inflammation. Emotional factors such as prolonged stress or anger can cause Liver Qi stagnation, which interferes with the Spleen’s function and contributes indirectly to digestive weakening. In chronic or long-standing cases, a pattern of Blood or Kidney deficiency may be identified; these patterns speak to diminished resources for tissue repair and resilience, which in TCM terms makes the gut lining harder to restore.

Treatment in TCM is always pattern-based and individualized. A practitioner would aim to strengthen Spleen Qi and its holding function, resolve Dampness, clear Damp-Heat if present, soothe Liver Qi, and support Blood or Kidney reserves where needed. That work is done with combinations of herbs and formulas chosen to fit the person’s overall pattern (for example, tonifying formulas to raise Spleen Qi, aromatic or draining formulas to resolve Dampness, or cooling herbs to clear Damp-Heat), alongside acupuncture points that support digestion and immunity. Dietary advice follows the same logic: foods that are warming, easy to digest and supportive of the Spleen (lightly cooked grains, root vegetables, modest proteins) are favored, while cold/raw foods, excessive dairy, greasy or highly processed items—foods that TCM considers to create Dampness—are reduced.

Modern TCM-informed care often blends these classical approaches with lifestyle changes—stress reduction, paced eating, and attention to sleep—that help the underlying energetic patterns rebalance. It’s important to remember that TCM interprets symptoms through a different conceptual framework than Western gastroenterology; a responsible practitioner will work in parallel with medical care when there are red flags or diagnosed organic disease (for example, celiac disease, infections, or inflammatory bowel disease), and will not replace evidence-based treatments for those conditions. If you’re curious about trying TCM for gut healing, see a licensed practitioner who will do a full pattern diagnosis rather than offering a one-size-fits-all remedy.

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It does seem odd that the body would have a protein that can make the gut “leaky,” but there’s a useful reason for it. Zonulin is part of a normal, tightly controlled system that lets the intestine open its tight junctions a little and briefly so the immune system can sample what’s inside the gut — tiny bits of food, harmless microbes, or potential threats — and decide whether to tolerate them or mount a defense. This small, temporary opening also helps move fluid and molecules across the lining during digestion and can assist in flushing out pathogens when needed. In a healthy person these openings are short-lived and well regulated, so they help the body learn and respond to what’s in the gut without causing harm. Problems arise only when that system becomes overactive or chronically “switched on,” which is when increased permeability can contribute to inflammation and symptoms.

Here’s a simple way to picture it.

Imagine your intestine like a long wall made of bricks, and the tight junctions are the mortar holding the bricks tightly together. Zonulin is like a little gatekeeper who can temporarily loosen the mortar so that things can slip through.

In a normal, healthy situation, say you eat a new kind of food or you swallow some harmless bacteria. Your body needs to “peek” at what’s inside so the immune system can learn about it. Zonulin briefly loosens the wall, lets tiny fragments pass through, and the immune system samples them. Once the job is done, zonulin levels drop, the wall tightens up again, and everything goes back to normal. This helps your body build tolerance and protect you without overreacting.

In a harmful situation, like in celiac disease, gluten triggers zonulin to be released too much and too often. Instead of brief, tiny openings, the wall stays more open than it should. That allows bigger pieces of food and microbes to cross into the bloodstream, which provokes constant inflammation and symptoms. Over time this damages the lining instead of protecting it.

So, zonulin is not “bad” in itself — it’s useful when carefully controlled, but harmful when the switch gets stuck “on.”

(...)  Zonulin can rise for several common, non-celiac reasons — infections or changes in your gut bacteria, certain foods or food additives (including gluten in some people), medicines like NSAIDs and excess alcohol, and even stress — and those things can make the gut more “leaky.” (PMC, BioMed Central)

To explain briefly and plainly: your gut barrier is normally kept tight but it responds to what’s in the gut. If bacteria overgrow, if there’s an infection, or if the mix of microbes shifts toward unfriendly types, those microbial signals can trigger zonulin release and loosen the tight junctions. Eating gluten (gliadin) causes a short-lived zonulin release in many people and a larger, sustained release in people with celiac disease; that same gliadin effect can occur to a smaller degree in some people without celiac. Certain modern food additives (some emulsifiers) and high-fat, highly processed diets have been shown in animal and early human work to alter the microbiome or mucus layer and raise permeability. Repeated use of gut-irritating drugs (for example, long-term NSAIDs) and heavy alcohol use also damage the lining and increase leakiness. Psychological stress works through the brain–gut axis and can likewise increase permeability. (PMC, BioMed Central)

One practical caveat: measuring “zonulin” in a blood or stool test is tricky. Many commonly used commercial tests are not specific for the original zonulin protein (prehaptoglobin-2) and may detect related proteins instead, so a high lab value does not always mean the zonulin pathway is truly overactive. That’s why doctors usually interpret such tests cautiously and focus more on symptoms, clinical context, or established permeability tests when needed. (PubMed, PMC)

If you’re worried about having an overactive zonulin response or a “leaky gut,” the sensible steps are to look for and treat obvious causes (infections, SIBO, medication use, excess alcohol), improve diet and reduce processed/emulsifier-heavy foods, manage stress, and discuss testing or targeted treatment with a gastroenterologist rather than relying on a single zonulin lab result. (PMC)

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