Leucine is one of the twenty basic amino acids. It and isoleucine are isomers. In nutrition, leucine is an essential amino acid for human body. Leucine is the most common amino acid in proteins, and it is important for normal development of infants and children and nitrogen balance in adults. It is speculated that leucine may play an important role in maintaining muscle by balancing protein biochemistry and decomposition. The main food sources of leucine are: whole grains, milk, dairy products, eggs, pork, beef, chicken, beans and leafy vegetables.
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