I confess I have trouble with this. Whenever my kids are around, I find myself "finishing" their uneaten food. When they are not around, I lose weight.Probably the most important thing I've learned to do is "throw it away". You do NOT have to finish ANYTHING. If I crave something and after a couple bites I'm satisfied, I toss it. Yes, it's wasteful, but, a necessary evil. No, I do NOT save it for later. I toss it. Very important. If I'm satisfied halfway through a meal, I toss it. I learned this from skinny people. If they are half way through a sandwich, but done, they toss it. I used to NEVER do that. I do now.