As most people know, low calorie diet depends on the fact that if you are going to diet successfully, the important thing to eat less calories than you actually use.
So what is a calorie?
The calorie is the standard unit for energy measurement in dieting. A 'calorie' is the the amount of energy required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure. If something has more calories, then it will provide your body with more energy to use when eaten.
Low-cal food types include bok choy, bell pepper, grapefruit, beef, and skimmed milk.