What are essential amino acids?

Essential amino acids are those that cannot be synthesized by the body and therefore must be obtained through dietary sources. There are nine essential amino acids that humans need for various physiological functions, including growth and repair of tissues, production of hormones, and the creation of enzymes. Since the body doesn't produce these amino acids, individuals must consume them from food sources such as meat, fish, eggs, dairy, and certain plant-based foods like quinoa and soy.

Understanding the difference between essential and non-essential amino acids is important in nutrition. Non-essential amino acids can be made by the body in sufficient quantities, meaning they don’t need to be ingested through diet. This distinction underlines the vital role of nutrition in providing the body with the essential building blocks it cannot generate itself.