The key to losing weight is controlling hunger. Scientifically, this is known as satiety. The science behind satiety is a complex orchestration of signaling system in the blood, gut, and the brain. Our patented Zone Foods can control this biological signaling for four to six hours. That's why we say "5 Hours, No Hunger". These Zone Foods not only have to work, but also they have to be delicious and exceptionally easy to use. The more you use our Zone Foods as meal replacements, the more you achieve Freedom from Hunger®.