Diverticulitis may be prevented by eating a diet high in fiber, drinking plenty of fluids, exercising and practicing good bowel habits. The most important prevention method is the intake of plenty of fiber and fluids. These substances increase the bulk of stools and make them softer and easier to move through the large intestine.

Patients may also be advised to avoid foods that may get caught in or irritate the diverticula, including nuts, popcorn hulls and large seeds (e.g., sunflower seeds). However, it is not clear if avoiding these foods will prevent symptoms.