There's little evidence exclusion diets help with IBS

But FODMAP is better than gluten free

There is too little data to recommend a gluten-free diet for reducing symptoms of irritable bowel syndrome (IBS), according to a new systematic review.

And only "very low-quality evidence" supports restricting intake of highly fermentable oligo-, di- and monosaccharides and polyols (FODMAP) to ease IBS symptoms, report Dr Paul Moayyedi and his colleagues from McMaster University in Canada.

Both gluten-free and low FODMAP diets have been recommended for IBS patients, with the latter being the most widely adopted, they write in the American Journal of Gastroenterology.

Dr Moayyedi and his team reviewed two randomised controlled trials of gluten-free diets, including 111 participants, and seven randomised controlled trials of low FODMAP diets in 397 participants.

In the gluten-free trials, patients who had responded to gluten restriction were randomised to