What are negative calories?
There is, of course, no such thing as negative calories. I assume that what you are talking about is something called negative calorie foods. The theory behind this kind of food is that one gets negative net energy from eating these foods. The idea is that it takes more energy to digest the food than one can get from the food itself.
Sadly, this appears to be just another myth that is put out by the diet food industry. There are not actually any foods that take more to digest than they give a person in energy.
There are anti-fat foods, those that have negative calories, meaning that eating them,body,in order to digest them,burns more calories than they bring.
So, fat are burnt by eating these foods.
The "more negative" and "more burning" are onion, carrot, celery, cucumber, beet, cabbage, squash, asparagus, endive, spinach, cauliflower, green beans, hot pepper, pineapple, mangoes, oranges, apple, blueberries, lemons , raspberries and strawberries.
To see their effect, they must represent at least 25% of daily diet and eat them fresh.