I'm bothered with diverticulitis too,actually had two flare ups this year,i also have slow transit which doesn't help but one thing YOU MUST keep away from are things that can get stuck in the diverticulae,my flare up came after eating desiccated coconut and the next flare up was after eating sesame seeds so keep away from indigestible stuff like that,especially seeds,so no seeded bread and watch for wholemeal bread too just in case seeds are in that. Don't worry too much,it's a pain (literally) when you get a flare up but ABs usually do the trick but you can be tender there for weeks after, can feel it sore when I need the loo after not going for a couple of days but I know it's not a flare up, can tell the difference nowadays.