Nuts, Hazel, Peanuts, sesame seeds, chillis, peppers, fried fatty foods, tomato juice, corn, onions, raw vegetables
red meat, berries etc should be avoided. The prime cause of diverticulitis is the modern lifestyle, causing your body to become diseased by acids, sugars, carbohydrates, excess fats and uric acid etc.I sincerely hopes it helps.
Take care and regards!