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Proteins are an important part of your bones, muscles, and skin. In fact, proteins are in every living cell in your body. Inside cells, proteins perform many functions, including:
Proteins are made up of building blocks called amino acids. Your body can make some amino acids but not others. Proteins that you get from meat and other animal products contain all the amino acids you need. These include both those your body can make and those it can't. Proteins from meat and other animal products are known as complete protein.
Proteins from plant products are incomplete proteins. That means that the proteins from one plant product don't contain all the amino acids your body needs. But another plant product may have the amino acids that the first one is missing. To get complete protein from plants, you need to eat a variety of plant foods. For instance, eating rice with beans or peanut butter with bread will give you complete protein.
You may have seen ads for protein powders and shakes that say their products contain amino acids that your body can't make. Although this is true, most people can get all the protein they need from food and don't need protein supplements.
Good sources of protein include:
Content last updated: June 17, 2008.