1 After one year, the Zone dieters had lost an average of 7 pounds, compared with 7.3 for the Ornish group, 6.6 for Weight Watchers, and 4.6 for Atkins, and fewer Zone (and Weight Watchers) dieters had dropped out (about 35 percent) than Atkins and Ornish dieters (about 50 percent). After one year, the Zone dieters had lost an average of 7 pounds, compared with 7.3 for the Ornish group, 6.6 for Weight Watchers, and 4.6 for Atkins, and fewer Zone (and Weight Watchers) dieters had dropped out (about 35 percent) than Atkins and Ornish dieters (about 50 percent).