alt Hacker News> This is largely outside of the control of the medical system
I assure you that preventative medicine does exist, even in the USA. Moreover, healthcare interventions for people with "lifestyle" diseases such as obesity have been extremely effective in reducing mortality from downstream causes such cardiovascular disease (e.g. statins).
Statins help a bit (and are widely prescribed in the US) but they don't fix the problem.
Diet and exercise are huge health variables that doctors don't really have the tools to do anything about.