Irritable bowel syndrome (IBS), also called spastic colon, nervous colon, and mucous colitis, is a gastrointestinal disorder affecting 9%-23% of people worldwide. 
While the exact cause of IBS remains unknown, it can be triggered by processed foods, certain fruits and vegetables, most sugar alcohols, caffeine, and alcohol — among other things like psychological stress and anxiety. Key IBS symptoms include abdominal bloating, pain, cramping, diarrhea, constipation, and excessive gas. 
Recent studies have shown that gut dysbiosis or the disruption of the gut microbiome and inflammation contributes to the onset of IBS. 
If you’re dealing with IBS and are looking to improve your condition through dietary changes, you might be wondering if the keto diet can help. This article explores the relationship between keto and IBS, what the research says, foods to eat and avoid, and three natural remedies to support your IBS diet.
Keto and IBS: Does a Low-Carb Diet Help?
The keto diet naturally limits your intake of FODMAPs (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) — these are short-chain carbohydrates that are poorly absorbed in your small intestine.
As a result, the answer is yes, going keto can help ease IBS symptoms. In addition, you’ll need to watch out for some sources of FODMAPs that happen to be keto-friendly, such as onions, garlic, and lactose-containing foods and drinks. Overall, however, the keto diet is essentially a low-FODMAP diet, which improves IBS.
Another way that the keto diet may help with IBS is by reducing inflammation, another factor that plays a role in IBS. One study on inflammatory bowel disease (IBD) found that the diet protects the intestinal barrier and reduces the expression of inflammatory cytokines.