The main reason people get diverticulitis is simple. People eat a lot of processed food. It's junk food with poor nutrion, terrible additive to enhance flavor (since it tastes like crap) and salt (increased blood pressure) and no natural fiber. To save money since people are more conscious of eating fiber, they add a filler made from wood called cellulose. That's abnormal fiber. Why not just eat cardboard?

If you keep putting that junk in your body, then your waste is not swept from the numerous folds of the intestines. It applied pressure and causes weakness in the walls of the large intestine. Some people even fail to have a bowel movement every day. That's shocking. All of that, plus family history, causes diverticulitis.

It's not caused by things like respiratory infection, but it could be caused by numerous gasteroenteritis. When you take an antibiotic, it kills a lot of helpful bacteria in the gut (intestines). Then a lot of people don't eat probiotics (food with good bacteria like lactobaccilis). Yogurt and kefir have it and the latter is delicious. It's a sweet drink that's more common now, probably due to more immigrants from Russia. Try it, they even make a lactose-free kind for people sensitive to milk.

Doing those things will really help you.