Which macronutrient primarily supplies energy to the human body?

Explanation

Carbohydrates, fats, and proteins are all macronutrients that provide energy. Carbohydrates serve as the body's main energy source, especially for muscles and the brain. Fats act as a secondary energy source when carbohydrate levels are low, while proteins mainly support tissue structure and metabolic functions. Thus, fats are an important energy provider, particularly during prolonged activity or fasting.