How much energy is released when 1 g of protein is broken down?

1 g protein – 4.1 kcal

The functions of proteins in the body are as follows:
1. Structural or building function;
2. Catalytic, i.e. enzymatic function;
3. Protective function;
4. Regulatory (maintaining the internal environment of the body – homeostasis) function;
5. Transport function;
6. Reserve function of proteins;
7. Contractive functions;
8. Receptor function;
9. Proteins are essential in metabolism.