Macronutrients

Carbohydrates are the most abundant nutrient on Earth for a reason. The body's main choice of fuel is glucose, which is the simplest form of a carbohydrate; carbs are broken down into glucose during digestion.

Proteins are essential for a healthy metabolism because most of the body's enzymes (which help speed up chemical reactions in the body, such as energy production) are types of proteins. Protein also makes up muscle and hormones, and the body uses it to build and repair its tissues.

Lipids have a role in hormone function, increasing bioavailability of certain nutrients, and contain over twice as much energy than the other two macronutrients.