What is protein?

Apart from water, our cells (other than fat cells) are mostly made of protein. Protein helps our muscles contract and gives a framework to bones. Enzymes, hormones, and the molecules that act as messengers are all made from protein. Protein helps build the genetic material in cells and the antibodies that fight off bacteria.

The protein in our bodies is in a constant state of flux. Some of your cells, for example, may break down protein to its basic building blocks, the amino acids. These amino acids can then be used to build protein somewhere else.

Healthy Eating for Life to Prevent and Treat Cancer, Physicians Committee For Responsible Medicine.

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