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Protein is an essential nutrient that promotes growth, strength, energy, weight loss, and more. Common sources of protein include poultry, eggs, beans, beef, milk, cheese, soy, and more. Some people enjoy protein bars or shakes. High-protein diets are popular, though not always healthy. Follow the links below to find WebMD's comprehensive coverage about protein sources, protein foods and diets, and much more.

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Thumbnail: Protein Powder: What You Should Know

Should you add a protein shake to your diet? Get the facts on whey, soy, and other protein powders.

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