Irritable bowel syndrome is one of the most common disorders diagnosed by gastroenterologists. Peppermint oil, specific probiotics, psyllium supplementation, first-line IBS dietary advice, and a low FODMAP diet can aid in improving IBS symptoms.

Fermented foods are a known source of lactic acid bacteria. A high-throughput sequencing analysis of food and human metagenomes proves that fermented foods are a source of lactic acid bacteria for the gut microbiome, and that abundance is shaped by both age and lifestyle.