what it means by Negative calorie effect and negative calrie foods is that they just use more calories to digest than the calories food actually contains. In other words, the body has to work hard in order to extract calories from these foods. This gives these foods a tremendous natural fat-burning advantage.
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*Originally posted by hiccup: *
are you sure about some of those sugar rich fruits?
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Yes, As far as I can remember. well, all foods have some calories. No food is actually "negative calorie" food. BUT the overall effect of certain foods in our body is that of negative calories. and as I said Negative calorie foods are foods, which use more calories than the calories the food actually contains. Calories from these foods are much harder for the body to breakdown and process.
These fruits/veges are natural plant foods with high carbohydrates and fibers and very less fat. It is very difficult for our body to break carbs and convert into fat needing much effort, whereas the fatty foods are added very easily to our body fat.
Those fruits are very high in fructose so it's unlikely that you'll burn off more calories eating them than they actually contain. Apart from watermelon which has a natural diuretic effect on the body.