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Proteins |
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Our bodies are made up of billions of cells, which contain protein. Throughout our lives cells wear out and are replaced. All the material for new cells comes from food. The main nutrient involved in the building of new cells and replacing of worn cells is protein |
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Composition of Proteins |
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Proteins are made up of small units called amino acids. The amino acids, which the body cannot make, are known as essential amino acids. Adults need 8 and children need 10 essential amino acids. |
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Proteins are broken down into amino acids in the digestive system. Amino acids are smallest units of Protein. They can then be used to build up different proteins for the formation of new cells in the body. Amino acids are made up of the elements carbon, hydrogen, oxygen and nitrogen. |
Proteins are classified into two groups: HBV and LBV.
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LBV FOODS
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High Biological Value
Low Biological Value
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HBV FOODS
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High Biological Value Proteins come mainly from animal foods such as meat, fish, eggs, cheese and milk. However some plant foods provide this type of protein e.g. soya bean. |
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Low Biological Value Proteins come mainly from plant foods such as peas, beans and lentils (pulse vegetables), whole cereals and nuts. These foods also contain fibre and are low in fat. |
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The functions of proteins are:
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The RDA of protein depends on your body weight. For every kilogram of body weight one gram of protein per day is needed, e.g. if you weigh 60 kg you need 60 g of protein per day. |
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ACTIVITIES |
Growth of new cells such as skin hair and blood.