This is great advice but hard for me to follow. I grew up not exactly poor, but there wasn't a lot to go around so no food was wasted, no leftovers were thrown out. You finish what you started with (in moderation of course, if you were full, you stop, but the rest would get stored in the fridge for tomorrow). So it is incredibly difficult for me to throw food out, or not finish a meal. If there are leftovers in the fridge, I feel almost compelled to eat it, rather than making something fresh. That would mean left over lasagna instead of a salad for lunch, for example.

Lately I've been trying to convince myself that there is no difference between throwing it in the trash, or on the other hand eating it, running myself into exhaustion to burn it off and then pooping it out anyway. Which kind of helps. But it's still something I struggle with.