Amber Rachdi's transformation is one of the most dramatic weight-loss success stories on My 600-lb Life. When she first appeared on the show, she was 23 and was over 650 pounds. After the gastric bypass surgery, Amber lost over 377 pounds.. Justin McSwain’s journey is also a memorable one.When he joined the show, he was weighing over 680 pounds and he could no longer go to an office and work. The surgery helped him drop over 400 pounds. Justin also discovered a love for mountain hiking and wall climbing.