What is the primary function of carbohydrates in the body?

The primary function of carbohydrates in the body is to provide energy. Carbohydrates are one of the three macronutrients, alongside proteins and fats, and they serve as a key source of energy for the body's cells. When consumed, carbohydrates are broken down into glucose, which is used by the body for immediate energy needs or stored in the liver and muscles as glycogen for later use. This process is essential, especially during high-intensity exercise, where carbohydrates become the preferred energy source.

The other functions of carbohydrates, while occasionally relevant in specific contexts, do not represent their primary role. For example, muscle building is predominantly facilitated by proteins, and while carbohydrates can indirectly support this by providing necessary energy for workouts, they are not the primary nutrient for muscle synthesis. Similarly, body temperature regulation is more influenced by overall metabolism, hydration, and fat stores rather than carbohydrate intake alone. Lastly, while certain types of carbohydrates, particularly fiber, can aid in digestion, this is not the primary function of all carbohydrates, and thus, energy provision remains their most critical role.