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White beans

In addition to being rich in fiber, protein, and iron, white beans are one of the best nutritional sources of potassium—1 cup will cover 25% of your daily requirement for this hypertension-fighting nutrient.

Beans get a bad rap when it comes to gas, but the key is to amp up your fiber intake gradually, Brown says. "If you only eat (low-fiber) foods right now, don't suddenly switch to eating 40 grams of fiber a day, because that will cause a lot of stress to the digestive system."

Try this recipe: Chicken-and-White-Bean Soup With Greens

Next: Black beans