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Protein provides the building blocks of muscle—lean, calorie-burning muscle that enables you to do everything you do, from going up and down stairs, to cruising the Curves Circuit, to participating in your local 5K for heart disease. And protein comes in all shapes, tastes, and textures: meat, poultry, fish, eggs, beans, nuts, dairy, and even grains. Here’s how to sort through the options for the ones that build lean muscle and good health.