From Michael Pollan's new Food Rules.
"It's better to pay the grocer than the doctor".
Most of us pay much more attention to the preventative maintainence of our cars than our bodies. Buying good food and cooking does take time yes, but so do angioplasty's, chemotherapy, and all the other medical procedures that can be prevented (or at least made less likely) through proper care of our bodies. If you were going to build a house, you'd probably want to get the best-quality lumber you could find. You will be in your body a lot longer than any external structure, so it's important to give yourself good-quality raw materials with which to construct. The tissues made from your food will stay in the body for weeks or months. What kind of house do you want to build today?