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Health.com: 5 Ways Your Healthy Diet is Making You Tired

6 of 7

You've Cut One Too Many Carbs

Food Fix: Hello, whole-wheat pasta and potatoes!

"Our bodies run on carbohydrates," says Zerner. "It's too bad they've gotten a bad rap." In a Tufts University study, women on a carbs-restricted diet did worse on memory-based tasks compared with women who cut calories but not carbs. And when the low-carb group introduced them back into their diet, their cognitive skills leveled out. Carbs help your body burn fat without depleting muscle stores for energy. The ideal diet is 50-55% complex carbohydrates, 20-25% protein and 25% fat. Complex carbs provide energy as they're digested, while protein and fat, along with fiber, slow the digestion process so the boost lasts a good long time. "Think about getting a mix of high-quality protein, carbohydrates and fat from whole, unprocessed foods over the course of any given day," says Dr. Katz. "That's really all we need."

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The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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