Final answer:
Essential amino acids are crucial for the body's functioning and must be obtained from the diet.
Explanation:
Essential amino acids are amino acids that the body cannot synthesize in sufficient amounts and therefore must be obtained from the diet. In humans, there are 9 essential amino acids that need to be consumed through food sources.
Proteins are made up of amino acids, and while the body can synthesize most amino acids, it cannot produce all of them. The essential amino acids must be acquired from dietary sources to support various bodily functions and processes.
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