What are we talking about?
The weight management depends upon the energy balance equation; the amount of energy you put into your body i.e. calories versus the amount of energy you expend (activity).Understanding your body's energy requirements can help guide you when making nutritional choices. There are three primary components that make up your body's energy expenditure. Adding these three components together, basal metabolic rate, energy expended during physical activity, and the thermic effect of food is the most accurate way of determining how many calories your body requires each day.
Calorie - unit of energy
A calorie is a unit of measurement for energy. However, it remains in common use for the amount of energy obtained from food. hey fall into two classes:
The small calorie or gram calorie is the energy needed to increase the temperature of 1 gram of water by 1 C. This unit of energy is equivalent to about 4.185 joule.
The large calorie or kilogram calorie is the energy needed to increase the temperature of 1 kilogram of water by 1 C.

The kilogram calorie is today also called to the gram calorie; this way, the term kilocalorie can also be interpreted to mean 1000 calories. However, where the term "calorie" is used in nutrition and food labeling, it commonly refers to the kilocalorie.
The "calorie" has become a common household term, because dietitians recommend in cases of obesity to reduce body weight by increasing exercise (energy expenditure) and reducing energy intake. Many governments require food manufacturers to label the energy content of their products, to help consumers control their energy intake. The number of calories you burn depends upon your weight, the activity you are indulged in and the intensity level you are exercising at. Any activity that you perform can be done at a variety of intensity levels. If you exercise at a higher intensity level, you will be working harder, expending more energy and burning more calories than someone who is not working quite so hard.

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