Proteins are essential macromolecules made up of amino acids, which are the building blocks of life. They play a crucial role in various biological processes, including the structure, function, and regulation of tissues and organs. Proteins are involved in everything from muscle contraction to immune responses and enzyme activity. Sources of protein include both animal and plant-based foods. Common animal sources are meat, fish, eggs, and dairy products, while plant sources include beans, lentils, nuts, and tofu. Consuming an adequate amount of protein is important for maintaining overall health and supporting bodily functions.