I'm so very sorry, I never thought of food as a triggering subject, although as soon as I read your post, it was like "D'oh." I will admit that I was thinking in terms of emotional struggles, abuse, etc. but if there's one thing I should know is that it's impossible to know someone else's triggers.
So I think the best thing is that we try to avoid what we see as triggering subjects and if something comes up, like food, that people feel free to speak up and say it's a trigger so that people know to avoid the topic in the future.
Thanks for saying something.