Energy is a basic requirement of man for the maintenance of the life, growth and physical output. Like other animals, human beings obtain their energy from food in which it exists in chemically bound forms in the molecules of carbohydrates, proteins and fats. This energy from food is liberated through the dynamic biochemical oxidative reactions in the body and is required for :
1. Maintaining the basal metabolic processes.
2. Promoting growth.
3. Regulating the body temperature.
4. Performing the various physical activities.
5. Specific dynamic effect of the food.
Energy is the invisible component needed for the functioning of our body. The energy used can be compared to the human labour needed in the building of a house. It is not a visible component such as cement, wood, steel, etc. of the house built; but it is an essential part of the building process. It is also necessary to run the house and to repair it. Similarly, energy is used to build our body, to keep it functioning, to enable it to carry our various activities (sitting, walking, playing, etc.) to keep it warm and to break-down the food into usable components. Factors Affecting Energy Requirements for the Body
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