Which nutrient is a macronutrient that provides energy for exercise?

• A. Carbohydrates
• B. Vitamins
• C. Minerals
• D. Water

Answer: (A)

Carbohydrates are the body's quick-energy fuel during exercise. They’re stored as glycogen in muscles and the liver, and when you start moving, enzymes break glycogen down to glucose and then to ATP, the energy currency your muscles use to contract. This process happens rapidly, which is why carbohydrates are the primary energy source for most types of exercise, especially at higher intensities.

Vitamins and minerals don’t provide calories or direct energy because they don’t yield ATP themselves. Water provides hydration but no usable energy either. Fat is another macronutrient that can supply energy, particularly for longer, lower-intensity activity, but it’s metabolized more slowly and requires more oxygen, making carbohydrates the go-to fuel for quick, efficient energy during exercise.