"Each of the macronutrients - carbohydrate, protein and fat - has a unique set of properties that influence health, but all are a source of energy" - National Institutes of Health

"Foods high in carbohydrates are an important part of a healthy diet.
Carbohydrates provide the body with glucose, which is converted to
energy used to support bodily functions and physical activity." - Harvard School of Public Health

"[Protein's] most important roles are in cell growth, repair, and maintenance, where they act as enzymes and hormones, to maintain fluid, electrolyte, and acid-base balance, uphold the immune system, among other functions." - Yale University

"Fats serve numerous functions in the body including protecting our organs, helping absorb and manufacture some important nutrients, manufacturing
some hormones, and also providing a source of energy." - Michigan State University