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Cold cereal
“Most cold cereals—even the ones that seem healthy—are carb-laden, sweet and highly processed. They are definitely not the breakfast of champions—at least not thin champions,” says Lauren Slayton, MS, RD, founder of Foodtrainers. Instead, “Starting your day with lean protein, like eggs, is the best way to ensure that you’ll stay energized and full into early afternoon,” says Slayton.