Vitamins may act as enzyme cofactors or coenzymes . Some vitamins are soluble in fats, some in water. Minerals are trace elements required for normal metabolism, as components of cells and tissues, and for nerve conduction and muscle contraction. They can only be obtained from the diet. There is a quantitative relationship between nutrients and health.
Imbalances can cause disease.
Many studies have concluded nutrition is a major factor in cardiovascular disease, hypertension, and cancer. This page takes a very long time to download a large number of impressive photographs of the system. Kristie Allen, Montana State University. There are several systems covered from this site, including an animation of the digestive system. The Human Digestive System Nancy Haupt, University of West Florida.