We already do something similar with smoking cessation. They, essentially, pay you to quit smoking. The social difference is that we frame smoking as an addict

We already do something similar with smoking cessation. They, essentially, pay you to quit smoking. The social difference is that we frame smoking as an addiction, and smokers as victims of the Tobacco industry. But we frame obesity as a moral failing. So, the former we're ready to jump in and help. But, the latter, we are much more hesitant. Theoretically, economic outcomes would override these social and moral effects. But leadership is often stupid, so we'll see.