That's a good point, life style does play a major part. But I think this point also opens another subject, preventive healthcare. Many modern healthcare system

That's a good point, life style does play a major part. But I think this point also opens another subject, preventive healthcare. Many modern healthcare systems are starting to focus on prevention for 2 main reasons: increase quality of life and reduce long-term healthcare costs. For example, in Finland public tobacco smoking is(was?) considered a public health issue. The government got actively involved to reduce consumption and this resulted in better overall outcomes in their healthcare systems for diseases caused or exacerbated by smoking. IMO, obesity is a problem affecting the healthcare systems of many developed countries (Vietnam is not yet considered a developed country) arguably not at the same levels as in the US. But this again is part of how government chooses to get involved in fixing the healthcare system by enforcing policies or passing laws that help with prevention.