Which three elements are classified as macronutrients?

Macronutrients are essential nutrients that provide the body with energy and are required in larger amounts compared to micronutrients. The three primary macronutrients are carbohydrates, fats (or lipids), and proteins.

Carbohydrates are the body's main source of energy and come in various forms, including sugars, starches, and fibers. Fats are also a concentrated source of energy and play critical roles in hormone production and the absorption of fat-soluble vitamins. Proteins are vital for growth, repair, and maintenance of body tissues and are made up of amino acids, which are the building blocks of life.

The other options include vitamins and minerals, which, while important for health, are classified as micronutrients because they are needed in smaller quantities compared to macronutrients. Similarly, fiber, sugar, and starch are not collectively classified as macronutrients because while fiber and starch fall under the carbohydrate category, sugar can refer to a simple carbohydrate but does not represent an entire group like the term macronutrient does. The last option lists minerals such as calcium, iron, and sodium, which are essential but also categorized as micronutrients.