The primary function of carbohydrates in the human body is to serve as a key source of energy. When consumed, carbohydrates break down into glucose, which is the body's preferred fuel, especially for high-intensity activities. Carbohydrates are essential for brain function and overall metabolic processes. They can be classified into simple and complex carbohydrates. While simple carbohydrates provide quick energy, complex carbohydrates offer sustained energy release. Balancing carbohydrate intake is crucial for maintaining energy levels and overall health.