Which food group contains phenylalanine?

Phenylalanine is an amino acid primarily found in protein-rich foods. It is present in various food groups, particularly in meat, fish, eggs, dairy products, nuts, and soy products. Additionally, it can also be found in certain grains and legumes. People with phenylketonuria (PKU) need to limit their intake of phenylalanine due to their body's inability to metabolize it properly.