What Are Your "Food Rules?"

Earlier this year Michael Pollan gave a shout out to his blog readers for their best "food rules." His 20 favorites are listed here. Here are my faves from his list:

"You don't get fat from food you pray over." (In other words, gathering around a table of food prepared at home is much healthier than food eaten on the run)

"Don't eat anything that took more energy to ship than to grow."

"Don't eat anything you're not willing to kill yourself."

And my number one favorite:

It's better to pay the grocer than the doctor.

Anyone have any of your own food rules to share?