How can this Cookie Diet work?

This diet is starting to create lots of interest, Dr. Siegal’s famous Cookies have been around for quite some time, Since 1975, more than 500,000 people have used Dr. Siegal’s® COOKIE DIET™ foods to help them reach their goals. They contain no drugs and are available without a prescription. You can enjoy them simply as a healthier alternative to other snacks, or you can use them to control your appetite as you follow a diet that your doctor directs and supervises.