FODMAPs (an acronym for “fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) are short-chain carbohydrates. They are difficult for the small intestines to absorb, so they are fermented by the microbiota in the large intestines of those with IBS. As this occurs, gas is produced by the microbiota, causing the person to feel gassy, bloated, and perhaps …