Fruits with Skin
Fruits like grapes and apples are good for treating diverticulosis, but not so much when they’re eaten with their skins or peels. The skins contain insoluble fiber, which can irritate the intestine. Before eating an apple, use a table knife to gently peel off the thin skin.
Processed Foods
Processed foods are not good for persons recovering from illnesses. They do not provide vitamins and minerals in their natural form and contain additives that may further irritate the diverticulosis. Unprocessed and natural foods are best to improve your symptoms.
Red Meat
A 2017 study showed that persons who are red meat as part of their daily diet were at risk of developing diverticulosis. Unprocessed red meat can cause inflammation or lead to an infection, which will worsen your symptoms and may cause complications. [5]
Reference:
[1] https://my.clevelandclinic.org/health/diseases/10352-diverticular-disease
[2] https://www.niddk.nih.gov/health-information/digestive-diseases/diverticulosis-diverticulitis
[3] https://www.ucsfhealth.org/education/diverticular-disease-and-diet
[4] https://gastrohealth.com/news/patient-care/to-eat-or-not-to-eat-living-with-diverticulitis
[5]https://www.emedicinehealth.com/what_foods_to_avoid_if_you_have_diverticulosis/article_em.htm