What Foods Contain Nitrogen?

Larry Hoffman/CC-BY 2.0

Foods that are rich in nitrogen include meat, fish, potato, milk, eggs, cereals and legumes. Most of the nitrogen in foods are found in proteins as amino acids, although nitrogen can also be present in various forms such as free amino acids, creatine, choline, creatinine, purines, pyrimidines and amino sugars. These trace compounds are called non-protein nitrogen, or NPN.

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