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Proteins consist of amino acids which fold into different proteins depending on the charge exhibited by each amino acid.

Proteases break down proteins

Organic nutrients:
carbon, hydrogen, oxygen and nitrogen

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Essential amino acids must be consumed in our diets.
Non-essential amino acids are synthesised by our bodies.

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17 kJ/g
4 kcal/g

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muscles
organs
skin

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Scientists concluded that the chicken came before the egg. This is because the protein which makes their eggshells can only be produced by hens

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The recommended intakes of a protein:
- Adult males (19-50 years): 64 g protein per day which is equivalent to 0.84 grams per kilogram of body weight per day.

- Adult females (19-50 years): 46 g protein per day, which is equivalent to 0.75 grams per kilogram of body weight per day.

On average the recommended intake:
Female: 45-60g/day
Male: 65-80g/day15-20%

Total Energy intake 15-20% (Our actual intake is 25%)

The recommended intakes of a protein is the same for all including athletes. However some athletes may need more protein, so professionals recommend a higher range of protein intakes.

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- responsible for the normal metabolism of the body and the transportation of substances in the body
- help the body grow or repair tissue
- make enzymes, antibodies and hormones
- carrying various substances in the human body, such as oxygen and fat
- regulate the physiological activity of various organs in the body through hormones and enhance the function of immunity
- animal protein enhances iron absorption
- increases Ca2+ excretion - for every 50g of dietary protein, 150mg of Ca2+ is excreted

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- Individuals adopting a vegan/vegetarian diet can find it difficult to find protein-rich sources of food. However, food items such as tofu, lentils and chickpeas are very reliable forms of protein as some contain approximately 10g per 1/2 cup of protein
-Eating pre-digested proteins (amino acid supplements) saves the body from having to digest proteins and keeps the digestive system from ‘overworking’.  Actually, the digestive system handles whole proteins better than pre-digested ones because it dismantles and absorbs the amino acids at rates that are optimal for the body’s use.
-People who associate meat with protein and protein with strength may eat steak to build muscles. To build strength, muscle cells need physical activity and all the nutrients – not just protein.