Here's the last installment of the Dietary Guidelines Nutrients of Concern series. Since the guidelines advise people to "Choose foods that provide more potassium, dietary fiber, calcium, and vitamin D, which are nutrients of concern in American diets," we've focused on discussing one of these nutrients per week. This week, we're going to talk about vitamin D...

What is potassium? Why is it a nutrient of concern? How can people increase their potassium intake? What impact does potassium have on health? Get the answers to all these questions -- and more! -- in today's post!