Complete proteins are proteins that contain all nine essential amino acids that the body cannot produce on its own. These amino acids are crucial for various bodily functions, including building and repairing tissues, making hormones, and supporting immune function. Foods that are considered complete proteins include animal products like meat, fish, eggs, and dairy, as well as some plant-based sources like quinoa and soy. In contrast, incomplete proteins lack one or more of these essential amino acids. Many plant-based foods, such as beans, nuts, and grains, are considered incomplete proteins. However, by combining different incomplete protein sources, such as rice and beans, individuals can still obtain all the essential amino acids needed for a balanced diet.