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'''Proteins''' are complex organic compounds whose basic structure is a chain of amino acids folded into a certain shape. They can take many forms and perform certain functions within a living being; being the main component of muscles, organs, and glands, in the human body, and is contained in every living cell. <ref> http://www.hsph.harvard.edu/nutritionsource/protein.html </ref>

'''Proteins''' are complex organic compounds whose basic structure is a primary chain of amino acids folded into a certain shape. This tertiary fold dictates the function of the protein within the organism. They can take on many forms and perform distinct functions including (but certainly not limited to) structural, enzymatic and transportation roles. In terms of structure, proteins are important in the construction and integrity of different body tissues including connective and muscular, as well as endocrine/exocrine glands. <ref> http://www.hsph.harvard.edu/nutritionsource/protein.html </ref>

Adult humans need a minimum of 1 gram of protein for every kilogram of body weight per day to keep from slowly breaking down their own tissues. Failure to receive enough protein can cause stunted growth, loss of muscle mass, decreased immunity, weakening of the heart and respiratory system, and eventually death. <ref> http://www.usda.gov/ </ref>

Adult humans need a minimum of 1 gram of protein for every kilogram of body weight per day to keep from slowly breaking down their own tissues. Failure to receive enough protein can cause stunted growth, loss of muscle mass, decreased immunity, weakening of the heart and respiratory system, and eventually death. <ref> http://www.usda.gov/ </ref>

There are two types of protein: ''essential'' and ''non-essential''.

There are two types of amino acids: ''essential'' and ''non-essential''.

Non-essential protein can be made by the body itself. There are 13 amino acids the body can manufacture on it's own. Essential amino acids cannot be made in the body and can only be obtained only from food. There are 9 amino acids the human body cannot produce on it's own. <ref> http://www.nutrition.gov/ </ref>

There are 13 amino acids the body can manufacture on it's own. Essential amino acids are those which cannot be made by the body and can only be obtained from the diet. There are 9 amino acids the human body cannot produce on it's own. <ref> http://www.nutrition.gov/ </ref>

Protein is also classified as ''complete'' or ''incomplete''.

Protein is also classified as ''complete'' or ''incomplete''.