Marion Nestle explains how to eat well.

Marion Nestle: An ideal diet is really very, very simple and it applies to everybody across the board.  Today obesity is the biggest problem that anybody has.  That means that calories are the biggest problem.  So my dietary advice would be to eat less; move more; eat plenty of fruits, vegetables and whole grains; don't eat too much junk food; and enjoy what you're eating.  It's as simple as that, and that applies to everybody.