People whose diets contain large amounts of fiber are less likely to develop diverticular disease. The American Dietetic Association recommends 20 grams to 35 grams of fiber a day, preferably from fruits, vegetables and grains. Your doctor also may recommend unprocessed bran or a fiber product. It is important to increase fiber intake gradually and to drink more water to increase the bulk of the bowel movements, which reduces pressure inside the bowel.
Physical activity also may lower the risk of diverticulosis. Many doctors previously recommended that people with diverticulosis avoid eating nuts, popcorn and foods with seeds. This restriction has not been proven to prevent diverticulitis.