I hate wasting. I'll even re-use a piece of saran wrap or a pretty clean paper towel. So it's no wonder that I try to make use of all of the parts of the food I cook. I do things as obvious as making a stock out of a chicken carcass or toasting croutons out of stale bread, and will even be adventurous and use carrot greens and fennel fronds.
With recent estimates warning us that Americans waste nearly 40% of our food, I wish that some others might start to hate wasting as much as I do. Sometimes we waste because we buy too much, we over-consume, our shopping carts are bigger than our family's stomachs. And so food gets thrown out with the garbage. Other times we just can't be bothered to make use of it all - how many of us have been guilty of not making turkey soup after Thanksgiving? And a lot of the time we just don't have any idea what to do with all of those parts. It takes time and energy to be creative with your onion ends, flat beer and watermelon rinds.
That said, there are some things even I haven't figured out how to eat myself... and so there's always pets and composting.