How many essential amino acids must be obtained from food?

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Multiple Choice

How many essential amino acids must be obtained from food?

Explanation:
Some amino acids must come from the diet because the body cannot synthesize them in adequate amounts. In humans, there are nine essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The body can synthesize the other 11 amino acids, making them nonessential. So, the number of essential amino acids that must be obtained from food is nine. (Note: under certain conditions, some become conditionally essential, but the standard adult count is nine.)

Some amino acids must come from the diet because the body cannot synthesize them in adequate amounts. In humans, there are nine essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The body can synthesize the other 11 amino acids, making them nonessential. So, the number of essential amino acids that must be obtained from food is nine. (Note: under certain conditions, some become conditionally essential, but the standard adult count is nine.)

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