The phrase "dietary protein" refers to the type and amount of proteins that an individual consumes through their food. Protein is essential for growth, repair, and maintenance of body tissues, and it plays a vital role in many bodily functions such as immune response, hormone production, and energy metabolism. A balanced diet should include adequate amounts of protein from various sources like meat, fish, poultry, eggs, dairy products, legumes, nuts, and seeds to ensure proper nutrition and overall health.