Worst IBS Trigger Foods: What to Eat Instead

3. Fatty foods

You may want to rethink that greasy slice of pizza. High-fat foods may trigger IBS symptoms because they slow down the movement of gas in the gut. As the food works its way through the gut, the colon contracts, trapping gas and fecal matter with embarrassing results. People with IBS should avoid fatty meat as much as possible, opting for leaner proteins like poultry and fish instead. These whole foods are better options than low-fat processed foods, which can contain more sugar. Creamy sauces and rich desserts are no-gos, too, but avocadoes and nuts are healthy sources of fat.