In simple terms, a low calorie weight loss regime says that in order to become thinner, it is important to eat fewer calories than you need.
The calorie defined?
The calorie is a unit for measuring food's ability to produce heat and energy. 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 a food type has more calories, then it will will give you more energy to use when your body digests it.
Low-cal food types include green beans, mushrooms, melon, steaks, burgers and chilis, and white eggs.