Go to http://www.chetday.com and you'll see the ad for the book on the left-hand side.

Look for the hour-glass and below it is a link (blue letters) that says "21 Days to Health and Beyond".

Here's a short quote from that url:
"People with chronic health problems like low energy and depression have reported dramatic improvement after completing my Twenty-One Days to Health & Beyond program and just about everyone who follows the program for three weeks will lose weight and feel great."