You know the signs of impending sickness: your nose is clogged, your head feels light and your throat has an uncomfortable tickle. Fight back the oncoming sickness with a morning cup of green tea if you want a boost of energy. "Regularly drinking this may help boost metabolism because of the caffeine and catechins it contains," says Gorin. "The caffeine may offer a small metabolism benefit for up to 24 hours -- and the catechins (particularly EGCG in green tea) have been shown to help metabolism, too," Gorin says.

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Whole milk yogurt with toppings

If you're in the anti-breakfast camp, you might struggle with downing anything but black coffee. For a low-cal option that's not heavy on your stomach, see if you can get through another one of Rizzo's go-tos. "I like yogurt made with whole milk, topped with a handful of almonds and chia seeds. This combo is high in protein and healthy fats, both of which keep you full without many calories and keep your metabolism in check," she says.

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