Which macronutrient is the primary source of energy for the body?

Carbohydrates are the primary source of energy for the body due to their efficient conversion into glucose, which serves as the main fuel for bodily functions, especially for the brain and muscles during exercise. When carbohydrates are consumed, they are broken down into simple sugars, primarily glucose, which can be readily utilized by the body for immediate energy needs.

The body's preference for carbohydrates as the primary energy source is evident during high-intensity activities, where glucose is metabolized rapidly to meet energy demands. Additionally, carbohydrates are readily stored in the form of glycogen in the liver and muscles, which can be mobilized quickly when energy is required.

While fats also serve as an important energy source, particularly during low-intensity or prolonged activities, their metabolism is slower compared to carbohydrates. Proteins primarily function as building blocks for tissues and enzymes, and while they can provide energy, their role is not as significant as that of carbohydrates. Vitamins, on the other hand, are micronutrients that support various physiological functions but do not provide energy directly. Therefore, carbohydrates hold the central role in energy provision for the body.