When you remove wheat, rye and barley you will experience an opiate withdrawl. Things to expect are headaches, exhaustion, fatigue, depression and flu-like symptoms. In fact this withdrawl, or die-off, is often considered an Atkins flu or Paleo flu.
Dr. William Davis, author of Wheat Belly
http://www.greenmedinfo.com/blog/do-hidden-opiates-our-food-explain-food-addictions1
