Mark Hyman, MD is a pioneer in functional medicine, practicing physician and best-selling author. A sneak preview of his book "The UltraSimple Diet" is available. See The UltraWellness Blog for more on Testing for Insulin Resistance: <a href="http://www.ultrawellness.com/blog/insulin-resistance" title="http://www.ultrawellness.com/blog/insulin-resistance" target="_blank">http://www.ultrawellness.com/blog/insulin-resistance</a>.