When I read this blog article it made perfect sense to me. We spend much time concentrating on how to save energy in the power grid we forget the wastes of energy in our food supply. Some of the things in the article are overly simplistic but overall I think the advise is good. http://wisdomfrommywife.blogspot.com/2007/04/how-to-save-environment-and-cure.html
Here is an excerpt of the article:
"Food is energy, so don't waste it. You shouldn't throw food away. That's wasting it. But at the same time, you shouldn't try to put the food in your body either, that's wasting it also. Once it gets stored in your body, you want to get rid of it, and you exercise, but you're not doing useful work with it. You are just burning it. So here's my tips on not wasting food..."