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If you like potatoes, try celery root (a.k.a. celeriac).

Why it's so good for you
Compared with a 134-calorie cup of potatoes, a cup of celery root has just 42 calories—and a third of the carbs, says Swift. And celery root is a superior source of phosphorus, a mineral that helps keep your skeleton strong.

How to enjoy
With its distinctive peppery flavor, celery root mash has more zip than mashed potatoes. Swift suggests peeling celery root and cutting it into chunks, then steaming until soft. Mash and add Greek yogurt, shredded Gruyère and Parmesan cheeses and salt to taste.