Study: Vitamin D May Promote Brain Health
A new study on Vitamin D comes from researchers in sun-drenched California. They say their research sheds light on how Vitamin D may help promote brain health.   Once Vitamin D is converted in the body to its active form, calcitriol, it binds to receptors in the brain.
NPR's Ira Flatow, host of <EM>Talk of the Nation Science Friday</EM>, talks to NPR's Madeleine Brand about a doctor who attributes several cases of headaches among his patients to their reading the latest massive Potter novel, <EM>Harry Potter and the Order of the Phoenix</EM>.