IN THE NEWS: A growing body of evidence finds that being just a little dehydrated is tied to a range of subtle effects — from mood changes to muddled thinking. Also, a lecture by a Harvard professor calling coconut oil "pure poison" has gone viral on YouTube.

MAIN: All About Iodine and Potassium. We discuss each micronutrient, including their role in health, current recommendations, food sources, signs of deficiency, populations at risk and possible toxicity.

TRIVIA: Can the gender of a bell pepper be identified by counting its lobes?

LISTENER QUESTION: I've heard that your body can't use the protein from beans unless you eat them with rice, is this true?

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