The primary function of carbohydrates in nutrition is to provide energy. Carbohydrates are the body’s main source of fuel during physical activity and are crucial for maintaining proper function of the brain and nervous system. When consumed, carbohydrates are broken down into glucose, which is then used by the body for immediate energy or stored as glycogen for later use. Including a variety of carbohydrate sources, such as whole grains, fruits, and vegetables, ensures a steady energy supply and supports overall metabolic processes necessary for daily activities and exercise.