For sure, they eat well: home-cooking and enough if it. And engage in physical labor. There is a lot in their way of living to admire, IMHO.
They’re not diagnosed, because they don’t go to doctors. They still get all that, but none are diagnosed.
Their lifestyle is not sustainable for the rest of us.
There are three Amish communities in our county totaling about 4,000. Last week, one of their saw mills burned to the ground. 4 days later, after embers all cooled, Amish men came from other states, and the structure will be up and running this week. Same with houses and barns. They work hard and are outdoors a lot.