What is the primary source of energy for the human body?

Carbohydrates serve as the primary source of energy for the human body because they are easily metabolized and provide a quick source of energy. When consumed, carbohydrates are broken down into glucose, which can be readily used by the body's cells to produce ATP (adenosine triphosphate), the energy currency of the cell. This process is especially crucial during high-intensity exercise or activities that require immediate energy.

While fats are also a significant energy source, they are metabolized more slowly and are used primarily during low-intensity activities or when carbohydrate stores are depleted. Proteins can provide energy, but their primary role is to support growth, repair tissues, and serve as enzymes and hormones, rather than as a direct source of energy. Vitamins, on the other hand, are essential for various metabolic processes and do not provide energy directly. Thus, carbohydrates stand out as the preferred and most efficient energy source for the body.