Final answer:
Essential amino acids are necessary daily since the body cannot synthesize them. They're vital for protein synthesis, body repair, and growth, and must be obtained from the diet as they can't be stored long-term.
Step-by-step explanation:
You need essential amino acids daily because they are crucial for various physiological processes, including protein synthesis, body repair, and growth. The body can make most amino acids, but there are nine it cannot synthesize, known as the essential amino acids: Methionine, Valine, Isoleucine, Leucine, Phenylalanine, Histidine, and Lysine. These must be obtained through your diet as your body does not have the capacity to store them for long-term use. Without a daily intake, your body would lack the raw materials necessary for vital processes such as tissue repair and enzyme production.
Foods from animal sources like eggs, milk, fish, and meat provide complete proteins, which contain all the essential amino acids. In contrast, plant sources often provide incomplete proteins, lacking one or more essential amino acids. Thus, it is vital to consume a varied diet to ensure that all essential amino acids are present to support bodily functions.