Overview Type: High-protein. Resembles these U.S. News-rated diets: Paleo Diet, Atkins The aim: Weight loss. The claim: You’ll lose up to 10 pounds within the first week, and continue at a clip of two to four pounds a week until you reach your goal weight – all while eating as much as you want (of the approved foods, of course). If you follow the rules to the letter, you’ll never regain. The theory: Counting calories isn’t the key to weight loss. Protein is. It’s a weight-loss powerhouse – it’s filling, takes time and work to digest, and has very few calories for each gram of food. When protein supplies the majority of a diet, and fats and carbs are all but squeezed out, fast weight loss ensues. (Limiting carbs, the body’s preferred energy source, forces the body to turn to an alternative fuel – stored fat.) That’s motivation enough for dieters to follow a strict plan that rewards the faithful by slowly adding back the bread, cheese, and fruit they so dearly mis...