Protein is a macronutrient used all throughout the human body that is built by amino acids. Protein has many essential functions in the body, such as repairing the body, creating and fixing DNA, supporting the immune system, and maintaining muscle mass. Although protein has such a crucial role in the body, not every protein can be produced by the body.

Carbohydrates are a macronutrient essential to the everyday life of humans and animals alike. Carbohydrates are the body’s main source of energy. Whenever energy is needed for a person’s muscles to move, they use carbohydrates. 

Lipids, or fats, are a macronutrient found inside our bodies. It has a variety of functions, but the most well-known is storing energy. This is important as our body uses this stored energy whenever it runs out of quick access energy, or carbohydrates.