Dairy
For a variety of reasons, dairy may be problematic for IBS sufferers. First, a lot of dairy products include a lot of fat, which can cause diarrhea. Switching to nonfat or low-fat dairy may help you feel better.
Second, a lot of IBS sufferers claim that milk makes their symptoms worse, while it's not known if this is true or if IBS patients are more likely to be lactose intolerant. Consider switching to dairy substitutes, such as plant milk and soy-based cheese, if you think that dairy or milk products are causing uncomfortable stomach issues. Focus on consuming other calcium-rich foods including greens, beans, nuts, sardines, seeds, etc, instead of dairy if you must fully take out dairy. It is advised to choose calcium-rich foods rather than calcium supplements because, according to a 2017 study, supplements frequently cause more harm than good.