Men and women, all of whom weigh at least 600 pounds, undergo gastric-bypass surgery. The series follows the changes in their weight and in their lives over a year.Men and women, all of whom weigh at least 600 pounds, undergo gastric-bypass surgery. The series follows the changes in their weight and in their lives over a year.Men and women, all of whom weigh at least 600 pounds, undergo gastric-bypass surgery. The series follows the changes in their weight and in their lives over a year.