If it's nice outside I like to take my dog for a walk, however in winter it's usually too cold. So anything that makes me use my hands...
playing on the computer
knitting/crocheting
scrapbooking
Anything that makes time go by and keeps me busy. If I'm useing my hands for good, I won't be using them for evil (food to mouth)!
I'm a bored eater so this works well for me.
Or, call a friend. There is noting worse than someone eating while you're talking to them!