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While we recently showed that a diet low in fermentable oligo-, di-, monosaccharides and polyols (FODMAP) successfully provided symptom relief in GFD-treated CeD patients, there have been concerns that the low FODMAP diet (LFD) could adversely affect the gut microbiota. Our main objective was therefore to investigate whether the LFD affects the faecal microbiota and related variables of gut health. In a randomised controlled trial GFD-treated CeD adults, having persistent gastrointestinal symptoms, were randomised to either consume a combined LFD and GFD (<jats:italic>n<\/jats:italic> 39) for 4 weeks or continue with GFD (controls, <jats:italic>n<\/jats:italic> 36). Compared with the control group, the LFD group displayed greater changes in the overall faecal microbiota profile (16S rRNA gene sequencing) from baseline to follow-up (within-subject <jats:italic>\u03b2<\/jats:italic>-diversity, <jats:italic>P<\/jats:italic> &lt; 0\u00b7001), characterised by lower and higher follow-up abundances (%) of genus <jats:italic>Anaerostipes<\/jats:italic> (<jats:italic>P<\/jats:italic><jats:sub>group<\/jats:sub> &lt; 0\u00b7001) and class Erysipelotrichia (<jats:italic>P<\/jats:italic><jats:sub>group<\/jats:sub> = 0\u00b702), respectively. Compared with the control group, the LFD led to lower follow-up concentrations of faecal propionic and valeric acid (GC-FID) in participants with high concentrations at baseline (<jats:italic>P<\/jats:italic><jats:sub>interaction<\/jats:sub> \u2264 0\u00b7009). No differences were found in faecal bacterial <jats:italic>\u03b1<\/jats:italic>-diversity (<jats:italic>P<\/jats:italic><jats:sub>group<\/jats:sub> \u2265 0\u00b720) or in faecal neutrophil gelatinase-associated lipocalin (ELISA), a biomarker of gut integrity and inflammation (<jats:italic>P<\/jats:italic><jats:sub>group<\/jats:sub> = 0\u00b774), between the groups at follow-up. The modest effects of the LFD on the gut microbiota and related variables in the CeD patients of the present study are encouraging given the beneficial effects of the LFD strategy to treat functional GI symptoms (Registered at clinicaltrials.gov as NCT03678935).<\/jats:p>","DOI":"10.1017\/s0007114523001253","type":"journal-article","created":{"date-parts":[[2023,6,5]],"date-time":"2023-06-05T10:24:52Z","timestamp":1685960692000},"page":"2061-2075","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":10,"title":["Effects of a low FODMAP diet on gut microbiota in individuals with treated coeliac disease having persistent gastrointestinal symptoms \u2013 a randomised controlled trial"],"prefix":"10.1017","volume":"130","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2268-180X","authenticated-orcid":false,"given":"Anne Mari","family":"Herfindal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7614-0016","authenticated-orcid":false,"given":"Frida","family":"van Megen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mari K. 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