What is the primary function of protein in food?

The primary function of protein in food is essential for growth, repair, and maintenance of body tissues. Proteins serve as the building blocks for the body's cells and tissues, including muscles, skin, and organs. They are made up of amino acids, which are crucial for various bodily functions, such as repairing damaged tissues and facilitating growth during periods of development, like childhood and adolescence.

While proteins do contribute to energy production, their main role goes beyond just providing energy. Instead, they are vital for maintaining a healthy body structure and supporting various physiological processes, which makes their role in growth, repair, and maintenance paramount. The other options describe important roles that nutrients like carbohydrates or fats play in the body but do not underscore the unique and primary function of proteins.