This is the diet par excellence for people who suffer from Irritable Bowel Syndrome and it does present undeniable positive aspects. Indeed a diet low in Fodmap (a group of fermentable short chain carbohydrates present in certain foods), significantly improves certain symptoms characteristic of irritable bowel syndrome (bloating, gas, abdominal pain).
The problem is that many of the foods incriminated in the Fodmap diet such as cabbage, lentils, onions for example are also healthy foods, which thanks to their prebiotic action promote the growth of good bacteria in the intestine. A study conducted in the UK has demonstrated it recently looking at the impact on the intestinal flora of this particular diet compared to the flora of subjects with a diversified diet. The results are unequivocal: the group on Fodmap diet developed a significantly poorer intestinal flora than the group with no food restriction after 4 weeks. (1)
What about the Fodmap diet then? This diet is justified for patients who have important symptoms, but the adverse effects on the microbiota must be taken into account.
*Fermentable Oligosaccharides, Disaccharides, Monosaccharides and Polyols
1. Staudacher HM et al A Diet Low in FODMPs Reduces Symptoms in Patients With Irritable Bowel Syndrome and A Probiotic Restores Bifidobacterium Species : A Randomized Controlled Trial Gastroenterology. 2017 Oct;153(4):936-947. doi: 10.1053/j.gastro.2017.06.010