Sean Johnson was camping at Duck Creek Village in southern Utah, when he lay down to sleep on the cot he'd recently purchased. That 2013 summer, six-foot-five Sean weighed 650 pounds and the cot was supposed to support 700 pounds of body weight. Instead it broke and he burst into tears. "Is this life worth living right now?" he asked himself. His answer was no. He told his wife, "For the first time ever, I can tell you I'm not happy with who I am and I don't know how to change it." The then-30-year-old had struggled with his weight all his life, but this was the breaking point. His family doc...