What is the primary function of carbohydrates in the diet?

The primary function of carbohydrates in the diet is to provide quick energy. Carbohydrates are one of the body's main sources of fuel, and they are particularly important for the brain and muscles during physical activity. When consumed, carbohydrates are broken down into glucose, which is used by the body's cells for immediate energy needs.

In addition to supporting high-energy activities, carbohydrates also help in replenishing glycogen stores in the liver and muscles after exercise, making them essential for recovery and endurance. This quick availability of energy is why athletes and those engaging in regular intense physical activity often prioritize carbohydrate intake.

The other functions listed, while important, do not capture the primary role of carbohydrates. Building and repairing tissues primarily relate to proteins; supporting immune function is more closely linked to vitamins and minerals; and transporting nutrients depends more on proteins and specific transport mechanisms within the body. Thus, the emphasis on carbohydrates as a major energy source highlights their crucial role in a balanced diet.