Hi. Thanks for using healthcare magic.As per your query I would like to suggest that natural remedies for diverticulitis are taking fiber rich food so that the bulk is formed and there is less stress on colon to move the stool forward.Pouch is formed on the wall of colon in diverticulum which can get infected or inflammed to cause diverticulitis.So much less stress should be given on colon.Take wholesome fruits like apple and oranges.spinach is usually very beneficial.avoid spices totally.no processed or preserved food.Take brown rice in place of normal rice.whole cereals are very beneficial.liquids in form of juices will help relieving from constipation.you can also give warm milk at night with munakka(variety of raisin)soaked in it.I am sure it will help .Make a timetable and work on it accordingly.Regular bowel movement should be there.Try him to get up a bit early in morning.Take breakfast early.Don t be empty stomach for long.You may be knowing that the permanent treatment for diverticulum is only surgery,so you should talk to your doctor about this.If pain is there,antibiotics and pain killer is needed and should consult your physician.I hope this information helps you.take care.