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Essential amino acids are indispensable nutrients that play a vital role in human growth, development, tissue repair, metabolism, immunity, and overall health. Amino acids are the building blocks of proteins, which are essential components of every cell in the body. Although there are about twenty amino acids commonly involved in protein synthesis, they are classified into essential, non-essential, and conditionally essential amino acids based on the body's ability to synthesize them. Essential amino acids cannot be synthesized by the human body in sufficient quantities and must therefore be obtained through the diet. From the perspective of community nutrition, ensuring an adequate intake of essential amino acids is critical for promoting health, preventing protein-energy malnutrition, supporting child growth, improving maternal health, enhancing immunity, and maintaining physical and mental well-being. Proteins are complex organic compounds composed of amino acids linked together by peptide bonds. During digestion, dietary proteins are broken down into amino acids, which are absorbed into the bloodstream and utilized for the synthesis of body proteins and other important biological molecules. Since the body cannot manufacture essential amino acids, regular consumption of protein-rich foods is necessary to meet physiological requirements. A deficiency of one or more essential amino acids limits protein synthesis and adversely affects body functions. There are nine essential amino acids required by adults. These include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Each of these amino acids performs unique and indispensable functions in the body. Histidine is particularly important during infancy and childhood because it supports growth and tissue development. It is involved in the formation of hemoglobin, tissue repair, and the production of histamine, which plays a role in immune responses, digestion, and neurotransmission. Histidine also contributes to the maintenance of the myelin sheath surrounding nerve cells, thereby supporting proper nervous system function. Isoleucine is one of the branched-chain amino acids (BCAAs). It plays an important role in muscle metabolism, energy production, wound healing, immune function, and regulation of blood sugar levels. It is especially beneficial for athletes and individuals recovering from illness or surgery because it promotes muscle repair and endurance. Leucine is another branched-chain amino acid that is essential for stimulating muscle protein synthesis. It supports muscle growth, tissue repair, regulation of blood sugar, and healing processes. Leucine activates the mTOR signaling pathway, which is responsible for initiating protein synthesis. Adequate leucine intake helps prevent muscle wasting, particularly among elderly individuals and patients suffering from chronic diseases. Lysine is necessary for proper growth, collagen formation, calcium absorption, enzyme production, hormone synthesis, and immune function. It contributes ____ ________ ___ __________ _______ ________ _____ ______ ____ _________.
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