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Last I heard, there were 27 identified complete Amino Acids which are essentially protein. Foods with complete Amino Acids are called First Class proteins, and they are the only foods that can build new tissue. They mostly come from animal products.

Second Class protein helps to repair body tissue, and they are mostly vegetable in origin. Vegetarians combine different types of incomplete or second class proteins to make sure there are the right sort of Amino Acids to join up to do the job of first class proteins, ie to build new tissues.

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13y ago

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