Calorie is a unit of energy. The energy can be measured by many methods. The calories in foods depend on their composition and the calorie value of a food is not actually its measured values, but is the average energy of a large number of different samples of the food.
1 calorie = 4.184 joule
1 negative calorie = -4.184 joules
Commonly Calories refer to kilocalories.
1 kilocalorie (kcal) = 4.184 kilojoules (kJ)
Negative calorie foods are foods, which use more calories to digest than the calories food actually contains! Calories from these foods are much harder for the body to use. In other words, the body has to work hard in order to extract calories from these foods. Even though a food may contain equal amount of calories, much less of these calories can possibly turn into fat in negative calorie foods as fewer calories are actually available to the body. This gives these foods a tremendous natural fat-burning advantage.
Consider the facts:
A piece of dessert consisting of 400 Calories (actually 400 kilocalories) may only require 150 Calorie (actually 150 kilocalories) to digest by our body, resulting in a net gain of 250 calories which is added to our body fat !
On the other hand, a 5 calorie raw piece of celery will require much more calories to chew and digest, so resulting in a net loss of calories from our body fat !! It implies that the more you eat, the more you lose weight!!!
Therefore, these foods are said to be good for achieving weight loss naturally without starving.
How it works?
All foods have a nutrient (carbohydrate, fat, protein), caloric (calories) and vitamin & mineral content. Vitamins stimulate living tissues to produce enzymes that breakdown the caloric nutrients of that food.
The foods with negative calorie contain sufficient vitamins & minerals that produce enzymes in quantities sufficient to break down not only its own calories, but additional calories from body in digestion as well. This is called "negative calorie effect".
The Free List of Foods Possessing Negative Calorie Effect
These foods will have maximum benefits when eaten without any empty calorie foods (junk foods). There are several foods such as vegetables and fruits that have negative calorie effect. Some of the foods that can be eaten in generous quantities are: Asparagus, Beets, Carrot, Zucchini, Papaya, Strawberry, Raspberry, etc. Look at the list below.
Free List of Negative calorie Foods
Negative Calorie Vegetables
Green Beans Lettuce
Negative Calorie Fruits
Negative Calorie Diet
This diet is based on the fact that in order to lose weight you have to burn more calories than you consume. The diet recommends to eat the foods from the above list. The negative calorie diet (some says it zero calorie diet) is very helpful in fast weight loss. You should know the complete list of the foods requiring your body to "burn" more calories processing them through your digestive system than the actual calorie content of the food itself. This results in your body burning up the excessive stored fat!