The theory behind the negative-calorie diet is that some foods have so few calories that our bodies actually burn more calories simply by eating the food than we gain from the food. For example, if an orange contains 50 calories, and our bodies burn more than 50 calories processing the orange, then we will have lost weight by eating the orange. All of the foods on this diet are either fruits or vegetables, including asparagus, broccoli, carrots, celery, lettuce, onions, apples, grapefruit, oranges, peaches, and strawberries.

On the Other: No Foods Possess Negative Calories

Critics of this diet point out that all foods have calories, and that you cannot eat your way to weight loss. In addition, you need a certain amount of calories to use for energy, especially if you are going to incorporate exercise in a weight-loss regimen.

Bottom Line

You can lose weight with this program by including the so-called negative-calorie foods in your diet. The recommended foods are good for you and contain plenty of vitamins and minerals. They may also raise your metabolism. While the term "negative-calorie" may be just a catchy phrase, there is benefit to eating the foods on this diet. However, to achieve weight loss, you must exercise and eat a balanced diet.

Source:

Healthy Weight Forum; Negative Calorie Diet: Diet Review

FatFreeKitchen.com; Negative Calorie Foods