Which statement accurately describes how essential amino acids are determined for humans?

Which statement accurately describes how essential amino acids are determined for humans?

• A. Essential amino acids can be synthesized in sufficient amounts by the adult human liver.
• B. The list of essential amino acids is determined by human biosynthetic capacity and dietary requirements.
• C. Essential amino acids are those that are only found in animal proteins.
• D. They are determined by the overall protein content of the diet.

Answer: (B)

Essential amino acids are those that must come from the diet because the body cannot synthesize them in sufficient amounts. The list is determined by two factors: which amino acids the human body can produce endogenously (its biosynthetic capacity) and how much of each amino acid is required daily (dietary requirements). If the body's synthesis falls short of its needs, that amino acid is essential and must be supplied by food. This captures why some AAs are required in the diet, while others can be made by the body. It’s not about whether animal proteins contain them, since many essential amino acids are also found in plants, nor is it about overall protein quantity, which doesn’t reflect whether all essential amino acids are provided.

Essential amino acids are those that must come from the diet because the body cannot synthesize them in sufficient amounts. The list is determined by two factors: which amino acids the human body can produce endogenously (its biosynthetic capacity) and how much of each amino acid is required daily (dietary requirements). If the body's synthesis falls short of its needs, that amino acid is essential and must be supplied by food. This captures why some AAs are required in the diet, while others can be made by the body. It’s not about whether animal proteins contain them, since many essential amino acids are also found in plants, nor is it about overall protein quantity, which doesn’t reflect whether all essential amino acids are provided.