Our daily protein requirement is really a need for amino acids. Dietary amino acids are classified as 'essential' or 'non-essential'. Essential amino acids cannot be manufactured by the body and must be supplied in the diet.
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The non-essential amino acids are also essential for health but can be synthesised in the body from the essential amino acids. Both the essential and non-essential amino acids are reassembled as hormones, enzymes, neurotransmitters (chemical messengers), antibodies and nutrient carriers.