Dr. Oz's advice for our teens can help anyone else starting a weight loss journey—make a long-term plan. "This is not a wind sprint. This is a marathon," he says. "Think of a GPS system in your car when you make a mistake, by the way. When you're driving along and you missed a turn, it doesn't berate you. It doesn't give you a hard time. It says, 'Hey, you know, next available moment, make an authorized U-turn.'"