Negative Calorie Diet
The Negative Calorie diet supposedly works because some 'negative calorie' foods contain lots of vitamins and minerals which improve your enzyme production enough to break down not only calories in that food, but also other calories present in your digestive system. Here are some 'negative calorie' foods:
The idea is to eat as much of these foods as you like. Starvation makes your body save body fat. Hopefully these foods will increase your metabolism and your extra fat will burn itself off.
My personal take is to eat those foods raw. Then you get all their enzymes as well. Cooking kills all the enzymes naturally present in foods.