What is the primary function of carbohydrates in the body?

The primary function of carbohydrates in the body is to serve as the body's main source of energy. Carbohydrates are broken down into glucose, which is then utilized by cells to produce adenosine triphosphate (ATP), the energy currency of the body. This energy is essential for various bodily functions, including movement, maintaining body temperature, and supporting metabolic processes.

Unlike proteins and fats, carbohydrates can be metabolized quickly, making them especially vital during high-intensity exercise or situations where quick energy is required. The classification of carbohydrates into simple and complex forms indicates how quickly they can be used for energy—simple carbohydrates lead to rapid spikes in blood sugar, while complex carbohydrates provide a more sustained energy release.

Other options listed do not represent the primary role of carbohydrates. For instance, the storage of vitamins pertains to the function of fats and proteins, while the protection against disease is typically associated with the immune system and nutritional components like vitamins and minerals. The transport of oxygen is primarily the responsibility of hemoglobin within red blood cells and is not related to carbohydrates.