More than 15 years ago Dr. Sears starting working with Greg Glassman, the founder of CrossFit, to integrate his Zone Diet with the innovative fitness programs Greg was developing for total functional fitness. At the time, the Zone Diet and the CrossFit training methods were both highly controversial since they challenged the basic assumptions of how diet and physical training should be done. Once Greg started introducing the Zone Diet concept into his training program, he immediately recognized the powerful synergism of the two programs. Fast forward to the present.

First off, I want to give my sincerest thanks to Dr. Sears for researching and coming up with this most reasonable of eating plans. It has changed my life. I am 63 years old and have never been diabetic in the past, but I was severely overweight.

In May of 2008, just out of curiosity, I asked a diabetic co-worker of mine to check my blood sugar on her glucose meter. She told me she would on the next day, but that I shouldn't eat breakfast until after the test. As it turned out, my fasting blood glucose was 428! She retested me a few more times over the next two weeks, and it was still in the low 400s. She advised me to immediately seek medical care and get on insulin.