The fundamentals of nutrition are based in chemistry. Taking courses in biochemistry, microbiology, chemistry and organic chemistry provide the foundation for learning about nutrition in the body. In order to understand how food affects one’s health, you need to understand the basic chemistry of food and physiology of the body. For example, to understand fat digestion and absorption, you need to know the chemical structure of fats, which is taught in organic chemistry and biochemistry. Also, the entire area of metabolism is based on chemistry.