As we age, some people develop small protrusions on the large intestine called diverticula, which in this case are called diverticulosis. When a protruding diverticulum becomes infected, intermittent abdominal pain occurs, which is called diverticulitis. When the diverticulum is inflamed, the patient will experience abdominal pain, nausea, vomiting, bloating, fever, constipation or diarrhea in addition to abdominal pain. It is generally accepted that a low-fiber diet can lead to diverticulosis and diverticulitis. Because of the high fiber diet, the incidence is low in Asia and Africa. Recently, the incidence has increased in our developed cities due to changes in diet. Diverticulosis is usually asymptomatic, so people do not realize they have diverticula. Diverticulitis needs to be treated with antimicrobials, but in severe cases surgery is required. 1, diverticulitis diet Diverticulitis diet as part of the treatment of severe cases, eating content including soups, juices, etc.. After the symptoms are relieved, slowly return to a normal diet. Fibrous tissue softens stool and increases stool volume, making it easier to pass through the colon and also reducing pressure in the digestive tract. Many studies have shown that eating fiber-rich foods can be effective in controlling diverticular symptoms. Aim to eat at least 25-35g of fiber per day. Fiber-rich foods include the following: whole wheat bread, pasta and buns soybeans fresh fruits (apples, pears, plums, etc.) vegetables (squash, potatoes, peas, spinach) 2. foods to avoid diverticulitis In the past, it was thought that patients with diverticulosis should avoid hard/indigestible foods, including nuts, corn, popcorn and various seeds, to prevent them from clogging the diverticula and causing inflammation. However, recent studies have found no scientific basis to support this dietary contraindication. In fact, nuts and seeds are fiber-rich foods that are recommended for patients with diverticulitis.