Since when and why can we not trust our instincts what to eat and what to drink and how much of each?

When the world was a simpler place, the rich were fat, the poor were thin, and right-thinking people worried about how to feed the hungry. Now, in much of the world, the rich are thin, the poor are fat, and right-thinking people are worrying about obesity.

The Economist: Editorial, December 13th 2003.

Sooner or later everything we’ve ever heard about staying healthy turns out to be wrong. They’ll probably decide chicken soup is bad for you.

Andy Rooney: Common Nonsense, PublicAffairs, New York, 2002.

It could be that we are still missing diet suggestions for cannibals ...