You will find a free list of negative calorie foods below, but first let’s consider what this means. There is no such thing as a negative calorie – a calorie is a unit of heat and it cannot be negative. So when people talk about negative calorie foods, this just means a food whose calorie level is low enough that it takes more energy to eat and digest it than the food contains.
For example, if you consider water to be a food, then cold water is certainly a negative calorie food. It contains no calories at all and the body has to expend energy to bring it up to blood temperature. So every time we drink a glass of cold water we burn up a couple of calories and lose a little weight. But there are very few foods like this. Most foods that are on the list do not really use more calories than they add, or if they do the effect is negligible … until you remember that at the same time the body expends energy just to keep alive and breathing. Celery for example does not give us enough calories to cover both the energy that it takes to digest it, plus the energy that we expend even when we are doing nothing. So that is why people call it a negative calorie food.
Negative calorie foods are most attractive to anorexics. A negative calorie diet would obviously result in starvation in the long term and nutritional deficiencies can occur surprisingly quickly. The calories burnt usually come from muscle mass, and the result is debility and wasting.
A more healthy way to use a negative calorie diet is as a form of fasting or detox. It is something you can do for one to three days right after the Christmas season or another time when you have been eating a over-rich diet. Provided you are otherwise healthy it can be a great way to clean out the system. However it is still best to take medical advice before attempting this.
If you decide to use a negative calorie detox, keep the following points in mind:
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