Are There Negative Calorie Foods?
January 31st, 2010
A negative calorie food is a food that is purported to require more calories to be digested than it provides. That is, its thermic effect is greater than its calorie content.
While this concept is popular in dieting guides, there is no scientific evidence that any of the foods claimed as negative calorie foods, are such. Celery, a commonly cited negative calorie food, actually requires only about 10% of its calorie content to be digested (due to the thermic effect)[.
The consumption of grapefruit, another commonly cited food, leads to weight-loss simply by taking up space in the stomach that might otherwise go to higher calorie foods. -wikipedia.com
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