2) Fatty foods

Immediately after it is consumed, fat stimulates the digestive system and cues the colon to go to work. Those with IBS will experience cramping, bloating, and the ever-evasive duo—constipation and diarrhea—at the same time. The colon will contract, trapping gas and fecal matter, causing pain. For those with an already spastic colon, this is bad news. The worst foods—and the ones that you should be avoiding—are animal products high in fat.

So, fatty meat, dairy, or greasy foods are all to be avoided as much as possible.