Reported by Andrea Cambern

Most diets tell you to avoid fast food at all costs. Now there's a new diet that lets you eat at all the major chains, and it's the brain-child of a heart doctor.
 
Heart doctor Stephen Sinatra is singing a different tune when it comes to diet. He's taking his patient, Stuart, out for a health lunch. The first stop is Burger King.
 
That's just one of the items you'll find in Sinatra's book, 'The Fast Food Diet.'

He'd rather have people eating healthy organic meals at home, but he says, "Sure, but it doesn't happen. I mean, 80 million people a day eat fast food."

The book acts as a guide.
 
Dr. Sinatra says, "Eating in a fast food restaurant is like weaving through a mine field. You have to choose smart. And if you choose smart, you're going to lose weight."
 
There are items from every major fast food outlet. For breakfast, Burger King french toast sticks; mid-morning, snack on McDonald's fruit and yogurt parfait; for lunch, KFC's roast chicken sandwich with sauce; then snack on walnuts from a convenience store; and for dinner, a Boston Market angus meatloaf with two healthy sides.

That's about 1,600 calories for the day.

You have to do some walking too. Dr. Sinatra says, "The secret to the fast food diet is this...If you shave 250 calories a day and walk a mile a day, that's another 250 calories. That's 500 calories a day. You do that seven days a week, that's a pound a week."
 
Do it every week for a year, and you've lost 52 pounds.