Alexander
This is an interesting topic. In my opinion there is little or no evidence that eating foods like popcorn, corn, nuts,a etc. precipitates diverticulitis. While these foods have anecdotally been associated with increased risk for flares, the only large study done evaluating these foods showed the possibility that none of these precipitated flares, and some may actually decrease flares. The best recommendation I can give is generally to prepare foods with higher fiber contents.