Final answer:
Essential amino acids are vital components that must be obtained through the diet, as the body cannot synthesize them in sufficient amounts.
Explanation:
Essential amino acids are amino acids that the body cannot synthesize in sufficient amounts, so they must be obtained through the diet. In humans, there are nine essential amino acids, including phenylalanine, valine, threonine, tryptophan, methionine, leucine, isoleucine, lysine, and histidine.
For example, histidine is essential for infants but not for adults, as adults can synthesize it. These essential amino acids play vital roles in protein synthesis, body repair, and overall health.
Essential amino acids are crucial components of a healthy diet, and their intake is necessary for various physiological functions within the human body.
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