My daughter with Cf loves popcorn but it does not love her. She'll get stomach aches and sometimes constipated from it. It's hard because if she's at a friends house or the movies I try to limit the popcorn. Everyone is chowing down on popcorn, I let her have a little bit(sometimes more) then switch to a different snack. I also will give her prune juice or high fiber stuff if I'm afraid she'll get constipated from it. Maggie doesn't understand though, she'ld just keep gobbling down the popcorn if I let her.