The primary function of macronutrients in the human diet is to provide energy and support bodily functions. There are three main macronutrients: carbohydrates, proteins, and fats. Carbohydrates serve as the body’s main energy source, while proteins are essential for growth, repair, and maintenance of tissues. Fats provide concentrated energy and support cell structure and nutrient absorption. Together, these macronutrients play a vital role in maintaining overall health, sustaining physical activity, and supporting metabolic processes.