Dr. Mark Hyman is a functional medical doctor who is currently doing so many amazing things to change how nutrition is viewed. Some of his books include; The Blood Sugar Solution, The UltraSimple Diet, The UtlraMind Solution and The 10-Day Detox Diet.
The video below presents Dr. Hyman talking about how your food choices can affect your health.
http://www.mindbodygreen.com/0-14363/dr-mark-hyman-on-sugar-the-only-rules-you-need-to-eat-healthy.html
For more information on Dr. Mark Hyman, check out his website www.drhyman.com