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Greek yogurt

This tangy, creamy yogurt is loaded with calcium and boasts plenty of protein—nearly twice as much as regular yogurt—to keep you feeling full throughout the morning. Your best bet: Choose a plain, nonfat variety, and add some fruit to give it some sweetness and flavor (and a dose of added nutrition).

"I love Greek yogurt because it's really quick and easy," Giovinazzo says. "You can always take it with you on your way out the door."

Next: Wheat germ