Fatty diet
Generally speaking, a high-fat diet is unhealthy and predisposes to various health problems, such as obesity, hypertension, diabetes mellitus, and heart diseases. A high-fat diet is low in fiber, which is a problem for constipation in IBS patients. A low-fat diet is beneficial for your IBS symptoms and your overall health.
Other foods, such as caffeine-containing drinks, coffee, and chocolate, should be avoided for some time (about 12 weeks) to see if the symptoms will improve.
Limit the alcohol intake as possible because it is a common trigger for IBS symptoms.