Video -P-WAa12yp0
Analysis Info
Type
Objective
Generated
Feb 21, 2026 at 8:15 PM
Model
gemini-3-flash-preview
Key Insights
34 insights1
A recent genetic study suggests a causal link between thamine (vitamin B1) levels at the gut wall and Irritable Bowel Syndrome (IBS).
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Thamine is primarily found in plant-based foods and fungi, including nutritional yeast, tahini, and beans.
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Therapeutic doses of thamine used in research typically involve supplementation rather than dietary intake alone.
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A 2026 Mendelian randomized study identified genetic variants in the thamine transporter SLC35F1 and phosphate exporter XPR1 as causal factors for IBS.
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Stool frequency data mapped against these genes reveals a U-shaped curve of activity.
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Genetic associations with stool frequency exist in approximately 7% of Europeans and 5.5% of East Asians, which corresponds with general IBS prevalence.
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Thamine deficiency disrupts gut motility by affecting the autonomic nervous system and the process of peristalsis.
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The vagus nerve requires thamine as a co-factor to produce acetylcholine to trigger gut movements.
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Insufficient acetylcholine leads to poor motility, which can manifest as constipation, diarrhea, or a combination of both.
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Thamine serves as a signal for the production of hydrochloric acid in the stomach.
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Low stomach acid allows undigested food to enter the small intestine, potentially driving Small Intestinal Bacterial Overgrowth (SIBO).
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Estrogen regulates the production of acetylcholine from thamine, which may explain the high prevalence of IBS in women.
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Hormonal fluctuations during menstrual cycles can cause temporary dips in thamine delivery to gut wall cells.
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A lack of thamine can cause the gut to produce lactic acid instead of acetylcholine, creating an acidic environment that activates pain receptors.
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Pain caused by an acidic coating from alternative metabolism is generally not visible on standard medical imaging.
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Soluble fiber intake is associated with positive outcomes for IBS management, while insoluble fiber may be abrasive to an inflamed gut.
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Fiber feeds specific gut bacteria, such as Bifidobacterium and Ruminococcus, which produce thamine.
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Bacteroides bacteria produce thamine when fiber is present but consume thamine when a host follows a high-meat diet.
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Low adherence to the plant-based Eat-Lancet diet is associated with 74% higher odds of having IBS.
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Prevotella is a fiber-fermenting bacterium that contributes to gut thamine production.
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Glyphosate exposure may lower thamine levels by reducing populations of Prevotella.
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Antibiotics and other chemicals that lower thamine-producing bacteria negatively impact gut health.
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Certain Clostridium species produce thaminases, which are enzymes that cleave and deactivate thamine.
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High consumption of meat and refined carbohydrates increases the presence of thamine-cleaving bacteria.
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Sulfites in processed meats and wine chemically cleave thamine and increase the production of genotoxic hydrogen sulfide.
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Thamine depletion slows gut transit time, potentially compounding the negative effects of hydrogen sulfide production.
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A 2013 pilot study found that high-dose thamine supplementation significantly reduced fatigue in patients with inflammatory bowel disease (IBD).
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The 2021 TARIFF study showed that 300 mg of daily thamine improved fatigue in 66% of IBD patients in remission.
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Patients with diabetes excrete thamine via the kidneys at a rate 15 to 25 times higher than the general population.
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Between 16% and 33% of individuals with obesity exhibit thamine deficiency in their blood.
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Postural Orthostatic Tachycardia Syndrome (POTS) is linked to thamine's role in autonomic muscle contraction and vasoconstriction.
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Thamine supplementation in post-COVID patients has been shown to shorten the duration of fatigue and hair loss.
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Fiber promotes a pro-thamine environment and gut motility, whereas refined carbohydrates and meat promote thamine-depleting bacteria (repeated).
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Over-the-counter thamine supplements are a low-cost, accessible intervention for addressing potential thamine-related IBS issues.
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