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In the United States, 60 million adults are obese and 9 million children and teens ages 6 to 19 are overweight. Being too heavy increases the risk of health conditions and diseases. In this university podcast, Harvard business professor Leslie John reports on studies providing financial and social incentives to get people to lose weight. Using lotteries and monetary deposits as collateral, researchers got people to lose an average of 14 pounds over several months. Leslie John spoke at The Science of Getting People to Do Good, a Prosocial Briefing held at Stanford.