The primary function of carbohydrates in a diet is to provide energy. Carbohydrates are the body's main source of fuel, particularly for high-intensity activities. They break down into glucose, which is utilized by cells for immediate energy or stored as glycogen for future use. While essential for overall health, the quality of carbohydrates matters; complex carbohydrates from whole grains, fruits, and vegetables are preferred for sustained energy and nutritional benefits. Balancing carbohydrate intake with fats and proteins supports overall metabolic health.