In simple terms, the low-cal diet depends on the fact that if you plan to lose weight, then you have to take in less calories than your body normally needs.
What is a calorie?
A calorie is a unit of measurement for energy. A calorie is the amount of heat required to raise 1 kilogram of water 1 degree centigrade. If your meal has more calories, then it will turn into more energy when eaten.
Low calorie foods include broccoli, cucumbers, apricots, steaks, burgers and chilis, and skimmed milk.