I am the weakest person you'll ever meet as far as willpower goes, and I quit buying the stuff that I like, but I do buy them SOME of the stuff they like. But really no sweets because it doesn't matter what it is, if it's sugar, I'll eat it.
They understand, and have made accomodations like buying candy at work/school and eating it there. It wasn't like I asked them or talked to them about it, it just sort of happened. Saves a TON on groceries too without buying all the junk.
I'm really glad my kids are mostly grown because I used to go all out for holidays.
So I don't think they should change their eating habits to accomodate my woe, but they have.