Which of the following foods contains all nine essential amino acids?

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Multiple Choice

Which of the following foods contains all nine essential amino acids?

Explanation:
Essential amino acids must come from the diet because the body cannot make them. A complete protein provides all nine essential amino acids in adequate amounts. Eggs are a complete protein with a well-balanced amino acid profile and high digestibility, so they supply all nine essential amino acids in one food. The other options do not provide all nine on their own: rice is low in lysine, corn is deficient in lysine and tryptophan, and beans are low in methionine. While certain plant combinations can complement each other to form a complete protein, no single plant item here contains all nine amino acids by itself.

Essential amino acids must come from the diet because the body cannot make them. A complete protein provides all nine essential amino acids in adequate amounts. Eggs are a complete protein with a well-balanced amino acid profile and high digestibility, so they supply all nine essential amino acids in one food. The other options do not provide all nine on their own: rice is low in lysine, corn is deficient in lysine and tryptophan, and beans are low in methionine. While certain plant combinations can complement each other to form a complete protein, no single plant item here contains all nine amino acids by itself.

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