My 37-year-old son has been told he has diverticulosis, and that he must eat more fiber (30g per day). What are the best sources for fiber in the diet?

D.F.

Diverticulosis is a condition in which small pouches (diverticula) appear in the wall of the colon. A number of factors have been linked to the formation of diverticula, including the aging process, chronic constipation and a diet that is low in fiber. The presence of diverticula is not a cause for alarm by itself. However, in some people, the pouches can bleed or become inflamed, a condition known as diverticulitis.

Doctors usually recommend that patients with diverticulosis increase the amount of fiber in their diets. The reasoning behind this recommendation is that there is evidence that higher intake of fiber can prevent more diverticula from forming.

An intake of 20-30g of fiber per day is recommended. The best sources of this fiber, present in the form of cellulose, are cereals (bran), breads (whole-grain), and certain fruits and vegetables (peas, carrots, beans and peanuts). Often, patients find it easier to add fiber supplements (Metamucil, Citrucel) to their diets.

Although a common side effect with increased fiber in the diet is bloating, this symptom eventually improves in most patients. Keep in mind that a diet high in fiber also has benefits when it comes to reducing the risk of heart disease, managing diabetes and preventing colon cancer.