The term "percent protein" refers to the amount or percentage of a food item that is composed of protein. Protein is an essential macronutrient required for growth, repair and maintenance of body tissues in humans and other animals. It plays many important roles in the body including building and repairing muscles, bones, skin, hair, and organs. The percent protein indicates how much of a food's calories come from protein, which can help individuals make informed decisions about their dietary intake to meet their nutritional needs.