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Foods that provide all of the essential amino acids are called complete protein sources, and include both animal meat, dairy, eggs, fish as well as plant-based sources soy, quinoa, buckwheat. High Protein Diet Foods Guide. While some amino acids can be synthesized in the body, there are 9 amino acids that humans can only obtain from dietary sources insufficient amounts of which may sometime result in death , termed essential amino acids. Mifflin St Jeor.