It is essential for the metabolism of carbohydrates and fats and assists insulin in transporting these nutrients into cells in order for it to be used as energy. (instantknockout.com)
These cells are responsible for transporting nutrients such as sugars and fatty acids into the body. (wi.mit.edu)
Inside your cells, proteins allow your body to break down food to power your muscles, send signals through your brain that control the body, and transport nutrients through your blood. (scientificamerican.com)