Irritable Bowel Syndrome (IBS) Abbreviation FODMAP: Fermentable Oligosaccharides, Disaccharides, Monosaccharides And Polyols Irritable bowel syndrome (IBS) can severely impact quality of life due to abdominal pain, bloating, diarrhea, and/or constipation. Symptoms can be improved by following a diet low in fermentable oligosaccharides, disaccharides, monosaccharides, and polyols (FODMAPs), but following this restricted diet can be challenging. This article provides guidance for all 3 phases of the low FODMAP diet for the treatment of irritable bowel syndrome.