When you look down at your dinner plate, you probably have a good idea of what each nutrient does for your body. When you see your mixed vegetables, you may think of vitamins and minerals that are essential to your immune system and healthy cells. Those whole-wheat rolls? They are a good source of dietary fiber for your digestive tract and your heart. And that roast beef delivers a healthy dose of protein for your muscles.

But did you know that this protein is also essential to your immune system? And healthy cells, and the digestive tract, and the heart! And pretty much every process within your body, such as your blood's ability to carry oxygen and communication between the nerve cells in your brain.
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