In vitro studies have shown that chestnut and quebracho extract has a prebiotic effect of modulating the intestinal microbiota, but also, bacterial fermentation produces metabolites with powerful anti-inflammatory effects such as quecetin. Irritable bowel syndrome (IBS) is a multifactorial disorder involving factors related to the intestinal microbiota, low-grade inflammation, and impaired intestinal permeability.~In this study, 30 patients with predominant IBS diarrhea and 50 healthy controls will be included. IBS patients will receive chestnut and quebracho extract twice a day for 8 weeks. They will be measured at baseline and at 8 weeks: 27 serum pro and anti-inflammatory cytokines and serum zonulin. Likewise, the intestinal microbiota and metabolomics will be evaluated.
Irritable bowel syndrome is a highly prevalent disorder and consumes many health resources. Its physiopathogenesis is multifactorial. Some of the factors involved have to do with the alteration of the intestinal microbiota, low-grade inflammation and the alteration of intestinal permeability. Specific tannins have been shown to have prebiotic effects and could be useful in treating this condition. This is an exploratory before-after study that aims to evaluate the effect of a chestnut and quebracho extract on the symptoms of IBS diarrhea predominant, serum cytokine levels, microbiota and intestinal permeability, as well as on metabolomics.