Maybe the answer is moderate excercise and books don't need to be sold about it?
People don't put much value on things they don't pay for. Their doctor will give them a healthy diet tailor-made for them for free (in civilized countries) but they'd rather buy a book. They'd rather pay Jenny Craig to tell them what to eat.
Just get off your behind for at least 15 minutes a day.
That's what bothers me about diets like the Paleo Diet. Ooh, it's soooo natural. Sure, it may be what our bodies have evolved to run on but those paleo-people had to go out and hunt and gather their food. Today's health nut wants to sit in front of his computer and order his perfect diet to be delivered to his front door, then go for a mind-numbingly boring workout once a week.
Personally, I would rather die of a heart attack yesterday than spend an hour on a treadmill. You need to find something you enjoy doing, something you wish you had more time to do.