Diet - calories

The energy stored in food is measured in terms of calories.

Technically, 1 calorie is the amount of energy required to raise the temperature of 1 gram of water 1 degree Centigrade. The calorie measure used commonly to discuss the energy content of food is actually a kilocalorie or 1000 real calories. This is the amount of energy required to raise 1 kilogram of water (about 2.2 pounds) 1 degree Centigrade.

Different foods contain different amounts of energy -- which is why a small piece of chocolate can have many more calories than a similarly sized piece of lettuce.

However, since calories are a measure of energy, there cannot be, as some diet books claim, different types of calories. A fat calorie has the same amount of energy as a protein or carbohydrate calorie.

A person's caloric need is determined using a variety of mathematical equations. Age, height, current weight, desired weight, and height are taken into account. Diet is what you eat. Dieting usually refers to eating less calories to lose weight.