Proteiner, or proteins, are essential macromolecules made up of long chains of amino acids. They play a crucial role in the body, serving as building blocks for tissues, enzymes, and hormones. Proteins are involved in various biological processes, including muscle contraction, immune response, and the transport of molecules. Proteins can be found in a variety of foods, such as meat, fish, eggs, dairy products, legumes, and nuts. The body requires different types of proteins to function properly, and they must be obtained through diet, as the body cannot produce all amino acids on its own.