Protein molecules are long chains of amino acids. Essential amino acids must be taken in by eating foo- they can't be madde in body. Non-essential amino acids can be made.
Protein supplies the nutrients that enable you to grow- important for teenagers to have high-protein diet.
Proteins from animal origin are called first class proteins because they contail all essential amino acids. Plant proteins are second class proteins.
In some parts of the world, food is in short supply so people don't get enough protein in their diet. In children, protein deficiency results in a disease called kwashiorkor which is common in poorer countries due to overpopulation and limited investment in agriculture.
Estimated Average Daily Requirement for protein using this formula: EAR=0.6 x Body Mass (kg). EAR is an estimated daily figure for an average person of a certain body mass- can vary depending on age, pregnacy and lactaion.
Protein is only used as an energy source when carbs or fats are unavailable.
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