Chemistry · Chemistry of Life

The amino acids which are not synthesized by the human body and must be obtained from the diet are called "Essential amino acids."

Essential amino acids are those amino acids that the body cannot produce on its own in sufficient quantities to meet its physiological needs. Therefore, they must be obtained through dietary sources. There are nine essential amino acids for humans: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

The amino acids which are not synthesized by the human body and must be obtained from the diet are called "Essential amino acids."

Essential amino acids are those amino acids that the body cannot produce on its own in sufficient quantities to meet its physiological needs. Therefore, they must be obtained through dietary sources. There are nine essential amino acids for humans: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

Non-essential amino acids are those that the body can synthesize on its own, so they are not considered essential in the diet.

Alpha amino acids refer to amino acids where the amino group (-NH2) is attached to the alpha carbon relative to the carboxyl group (-COOH). Most amino acids, whether essential or non-essential, are alpha amino acids.

Beta amino acids are a different class of amino acids where the amino group is attached to the beta carbon. They are less common in biological systems compared to alpha amino acids.