There is some evidence that shows that shifting fat and carbohydrate calories to protein calories may help preserve BMR during weight loss. But don't overdo it—twenty-percent of daily calories from protein is as high as you should go.
Fat! No fat! Sugar! Protein! Fruit only! Food combining! Enough already! David L. Katz, MD, busts the bogus claims of some of today's best-known weight loss programs.