All combustion reactions are always exothermic which occur in the presence of an excess of air or oxygen. Substances acting as fuels undergo combustion when heated. It is not necessary that a particular substance undergoing combustion may burn also. The human body is just like a furnace or machine in which various foodstuffs that we eat undergo combustion. They provide the desired energy needed for the body's function.
Which is the major source of energy for the human body?

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Solution

Carbohydrates
The main source of energy for the human body is carbohydrates.
Carbohydrates are polyhydroxy ketones or aldehydes or compounds that produce such compounds on hydrolysis.
The main source of carbohydrates for us humans is glucose and we intake it in various forms (from starch, lactose, glycogen, etc.)
Therefore, the major source of energy for the human body is carbohydrates.

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