The countries that rank above us for lifespan have universal healthcare, a better social safety net overall, and strict regulations on their food supply.
There's more to lifespan than healthcare. No amount of bedside manner will fix a stressful job with no PTO and McDonald's for lunch 4x a week.
Steve Jobs tried to treat pancreatic cancer with green tea, juice, and accupuncture. Turns out those are not very effectvie cancer treatments.
I'm all for eating healthy, getting enough rest, hydrating properly. Those are excellent ways to maintain your health. But when that fails and you become ill, or if you have an actual medical condition, broccoli isn't going to fix it. People with schizophrenia need pills, not brown rice.