Foods such as meat, eggs, milk, soya and nuts are given as examples of those high in protein. Protein is described as being used to make new cells and repair damaged ones. It is also described as being needed to make enzymes for digesting food and antibodies to fight infection. The break down of protein during digestion and absorption into blood is mentioned.

First broadcast:
25 March 2003

Discuss in more detail the role of protein in the growth and repair of cells. In particular, proteins should be looked at in relation to enzymes and the part they play in essential body processes.