Force the individual to take more responsibility for their own choices? By reforms like making soda more expensive? Soda taxes are not an individual choice, they're a systemic solution. Look, you've been saying a few things that are contradictory, so I don't think you have a really well formed idea about what causes fatness, either on an individual or population level. I'd suggest looking into the research a bit more and seeing if you can reconcile what you find with your ideas about how humans work, both individually and as a population. If you can't, then it might be time to update some of your beliefs. I don't think either of us have anything further to gain from this exchange until you do. Have a good one.