Covert Bailey is a nutritionist who advocates a pretty simple exercise and meal routine.

His website:

http://www.covertbailey.com/

I have Ultimate Fit or Fat

http://www.covertbailey.com/products.asp?id=80

and Smart Eating

http://www.covertbailey.com/products.asp?id=90

UFoF is pretty much his whole theory: lots of aerobic exercise (meaning you can speak short phrases while doing it, but you couldn't deliver a monologue) and a fairly straight forward food plan.

SE is a little bit more on the food part of the theory, plus a ton of low-fat recipes. I've tried a few of them some are really pretty good.

Both books are really cheap and you can probably read through them in a night or two.

What I like about him is that he very much encourages exercise -- he doesn't think you can be healthy without incorporating exercise, no matter how well you eat. I buy that. Also, his food plan seems pretty sensible. And I've felt a lot more energetic with a low-fat meal plan, so aside from any health concerns, it's nice to feel like a kid again. (I know, to many of you, I'm a kid already. But seriously, the first few days I ate low fat, I was climbing around on guard rails and generally just feeling exuberant, looking for things to play on. That's cool.)