What is the function of carbohydrates in the body?

Carbohydrates serve as the body's primary source of energy. When consumed, they are broken down into glucose, which is utilized by cells for immediate energy needs. Glucose can also be stored in the liver and muscles as glycogen for later use, making carbohydrates crucial for maintaining energy levels during physical activity and day-to-day functioning. This role is fundamental because the brain and muscles rely heavily on glucose as a fuel source, particularly during intense exercise or cognitive tasks.

The other options, such as tissue repair, muscle mass building, and hormone regulation, involve different nutrients and biological processes. For example, proteins are primarily responsible for tissue repair and muscle building, while certain fats and specific dietary components play a role in hormone regulation. Thus, carbohydrates are distinctly recognized for their function in energy provision, establishing their vital role in nutrition and exercise.