> If a person wants to pay attention to their lifestyle and health, then in the US he will get one of the best results in the parameters you listed. That is just a fact.

Is it? What are some obstacles to a similarly committed person attaining health/lifestyle benefits in other developed countries? What are the factors uniquely provided by the US that make this “fact” true? Are there factors in the US working against good outcomes for committed people?

> What are some obstacles to a similarly committed person attaining health/lifestyle benefits in other developed countries?

Poverty, underdeveloped medicine, less variety of relevant goods and services