Efficacy of a Low FODMAP Diet in IBS Children and Impact on Urinary and Faecal Metabolome

patients will be randomized to low or standard FODMAP diet for 14 days; then, children from both arms started the wash-out period of two weeks and subsequently started the final 2-week period on standard or low FODMAP diet. The LFD will have a FODMAP content expressed in grams 0.15 g/kg/d FODMAPs (maximum 10 g/day) while the SFD will contain 0.7 g/kg/d FODMAPs (maximum 60 g/day).