What is the primary function of carbohydrates in the body?

The primary function of carbohydrates in the body is to provide quick energy. Carbohydrates are one of the essential macronutrients and are primarily made up of sugars, starches, and fibers. When consumed, carbohydrates are broken down into glucose, which is then used by the body for immediate energy needs. This is especially important for activities that require quick bursts of energy, such as high-intensity workouts or during activities where the body needs fuel quickly.

While carbohydrates do contribute to other processes in the body, such as aiding in the overall metabolic function and maintaining energy levels, their primary role is serving as a readily available energy source. This is why athletes and individuals engaged in strenuous activities are often encouraged to consume carbohydrates in their diets to sustain performance and recovery.

In contrast, the other functions mentioned in the options serve different purposes. Building muscle is primarily related to protein intake, storing fat is a function of lipids, and repairing tissues involves both proteins and various nutrients like vitamins and minerals. Thus, the emphasis on carbohydrates is mainly due to their immediate role in providing energy, making the correct answer focused on this essential aspect of nutrition.