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Leaky gut syndrome is a hypothetical and medically unrecognized condition.[1][2]
Unlike the scientific phenomenon of increased intestinal permeability ("leaky gut"),[1][3] claims for the existence of "leaky gut syndrome" as a distinct medical condition come mostly from nutritionists and practitioners of alternative medicine.[1][4][5] Proponents claim that a "leaky gut" causes chronic inflammation throughout the body that results in a wide range of conditions, including myalgic encephalomyelitis/chronic fatigue syndrome, rheumatoid arthritis, lupus, migraines, multiple sclerosis, and autism.[1][4] There is little evidence to support this hypothesis.[1][6]
Stephen Barrett has described "leaky gut syndrome" as a fad diagnosis and says that its proponents use the alleged condition as an opportunity to sell a number of alternative-health remedies – including diets, herbal preparations, and dietary supplements.[5] In 2009, Seth Kalichman wrote that some pseudoscientists claim that the passage of proteins through a "leaky" gut is the cause of autism.[7] Evidence for claims that a leaky gut causes autism is weak and conflicting.[8]
Advocates tout various treatments for "leaky gut syndrome", such as dietary supplements, probiotics, herbal remedies, gluten-free foods, and low-FODMAP, low-sugar, and/or antifungal diets, but there is little evidence that the treatments offered are of benefit.[1] None have been adequately tested to determine whether they are safe and effective for this purpose.[4] The U.K. National Institute for Health and Care Excellence (NICE) does not recommend the use of any special diets to manage the main symptoms of autism or leaky gut syndrome.[1]
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