Functions of Amino Acids: Proteins act as enzymes , hormones , and antibodies . They maintain fluid balance and acid and base balance. They also transport substances such as oxygen, vitamins and minerals to target cells throughout the body. Structural proteins, such as collagen and keratin, are responsible for the formation of bones, teeth, hair, and the outer layer of skin and they help maintain the structure of blood vessels and other tissues.

antigens. Antigens are usually foreign substances such as bacteria and viruses that have entered the body and could potentially be harmful. Immunoproteins, also called immunoglobulins or Enzymes are proteins that facilitate chemical reactions without being changed in the process.
Hormones (chemical messengers) are proteins that travel to one or more specific target tissues or organs, and many have important regulatory functions. Insulin , for example, plays a key role in regulating the amount of glucose in the blood. The body manufactures antibodies (giant protein molecules), which combat invading antibodies, defend the body from possible attack by these invaders by binding to the antigens and inactivating them.

If these critical components for a healthy body are not provided as part of a healthy diet, the body will look for other sources for them.  This can include breakdown of our organs, leading to chronic problems such as liver and kidney problems, diabetes and heart disease among others.