I've been reading Michael Pollan's excellent The Omnivore's Dilemma and getting schooled on food.
Pollan's gig is very common sense: Don't eat foods your great-Grandmother wouldn't recognize, only eat foods from the perimeter of the supermarket, or better yet shop at a farmer's market/co-op, and slow down and enjoy your food.
Sales for fat-loss products & services in the U.S. is something around $60 BILLION a year. But the irony is that the reason people have to fork out for those products is because they have too much of the wrong stuff on their forks every day.
It really is simple. Ignore the latest headlines regarding miracle foods etc... because that is why half the U.S. population is obese, and just eat some real vegetables, fruits, meat, and grains.
As in training follow the K.I.S.S principle(keep it simple, stupid). Eat real food and do basic, hard exercises.
Getting down off my soapbox now, I highly encourage you to watch this video of Pollan talking at the Google Campus (yo Henry!) last year.