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Makes sense to me, but I would like to have specific data that would help me understand: - How much money work needs to be invested for what incremental effect? - What kinds of investments are most effective? - How much does effectiveness depend on specific cultural factors, vs. being culture independent?

And many more similar questions.

The socialized medicine in my home country does pretty much nothing to promote healthy lifestyle. People generally are healthy and not obese, but socialized medicine have nothing to do with it, it’s rather the culture at large that’s responsible.

Could it be that the socialized medical systems of which you speak are Western? Many of the European systems exist within a realm where people ate and continue to eat relatively healthy food due to historical circumstances. Further, they had and continue to have economies based around the idea of walkable cities. These two factors reduce the chances of obesity and the risk of death due to cars. The only way for America to approach either of these is to have everyone one to move into planned mega-cities.