Round Table China - Are you low on vitamin D?

Think fatigue, muscle weakness and constant achiness are just part of modern life? New research points to a hidden culprit most of us never check: vitamin D. Adults in China are overwhelmingly falling short, with younger people hit hardest by indoor lifestyles. / Is your prefrontal cortex attractive (17:42)? On the show: Steve, Fei Fei & Yushun