By your link we're 52nd in doctors per capita. That's not great. Plus I'd already noted that we've made a concerted effort to undo the damage since the 90s. Are you suggesting that supply and demand has no impact whatsoever on the wages doctors are capable of demanding? Do you believe that artificially restricting the supply for decades has had no impact on wages whatsoever?
>https://obesity.procon.org/view.resource.php?resourceID=0043....
https://medicalxpress.com/news/2018-01-mortality-obesity-sta...
But obesity is not the only issue, general issues related to poverty are:
https://www.newyorker.com/tech/elements/why-america-is-losin...
Higher adolescent pregnancy rates, higher rates of HIV, etc.
=== Most experts estimate that modern medical care delivered to individual patients—such as physician and hospital treatments covered by health insurance—has only been responsible for between ten and twenty-five percent of the improvements in life expectancy over the last century. The rest has come from changes in the social determinants of health, particularly in early childhood.===
So best case scenario access and affordability to healthcare accounts for about 25% of improvements in life expectancy. Except the majority of people already have access to healthcare in the US. It's not as available and affordable as we'd like, and we're talking about how best to improve availability and affordability, but it's a tiny fraction of the problem of why US health outcomes are so bad.