“Eggs are a great energy source—they have iron, zinc, and a lot of protein,” White says. Science agrees: A 2009 research review found that protein not only helps build muscles and keep you full, but it supplies sustained energy as well. The 6 grams of protein in an egg helps maintain level blood sugar and includes the amino acid leucine, which is an important part of protein synthesis (a factor in muscle growth and recovery). Meanwhile, B vitamins assist with energy production in the body.
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