Eat if you want to. It's not what you eat, it's how much. I was told that you're allowed to eat frequently throughout the day, but the portions can be no bigger than the palm of your hand.

Then, as long as you walk at the end of the day, you'll be fine. Unless you're looking to lose a lot of weight or something, then this helps keep you fed and healthy.

At least, that's what my family physical therapist told me.