I am sure I will not be the only person linking to this great article from the NY Times by Michael Pollan. The article is called "Unhappy Meals" and the headline is "Eat food. Not too much. Mostly Plants."
I hope Mr. Pollan will forgive me for my very brief precis:
Eat food: what your great-grandmother would recognise as food (and nothing with a health claim or more than about five ingredients on the box)
Not too much: most of the US national eating disorder is about eating too much - don't
Mostly plants: plants come to us as whole food, with a balance of goodness we evolved around - most of the other stuff is either bad for us in and of itself, or is bad for us the way we process and eat it
Reward: health and long life.
There is a motif in there about maintaining a traditional, community approach to food as a means to healthful eating. I wonder if the Jewish and Kosher approaches have such benefits ... somehow I am doubtful!