I have been following the Zone for about a year and a half, and I've lost 40 pounds. I really only wanted to be thin again, but I discovered other significant health benefits along the way. I have suffered from migraines/tension headaches and insomnia for nearly all my life. They are cut back now by about 90 percent. I also have suffered with colds/sinus infections about three-four times a year. Well, I've had ONE sick day in two years now!! Following the Zone and a very rigorous exercise program have literally changed my life for the better, significantly. I can't say thank you enough!