Which nutrient is primarily used for energy in the body?

The correct answer is carbohydrates because they serve as the body's primary source of energy. When consumed, carbohydrates are broken down into glucose, which is utilized by the body’s cells to produce energy. This energy is crucial for all bodily functions, from muscle movement to brain activity.

Vitamins and minerals, while essential for various bodily processes, do not directly provide energy. Instead, they act as catalysts in biochemical reactions and contribute to maintaining overall health. Water is vital for hydration and plays a significant role in many physiological processes, but it does not provide energy in the form that the body can use. Therefore, carbohydrates are uniquely positioned as the most important nutrient for energy production in the body.