Lowest obesity spots in the US look to be Aspen, Vail, Boulder, Telluride, Santa Fe, Jackson Hole, Park City, Big Sky, and Sun Valley: i.e., the private jet uber-class and the off-season ski-bums who build them their 2nd (or 3rd or 4th) homes.
I rode on a bus back to Aspen from Glenwood Springs once with 3 white water rafting guides who got by in summer in costly Aspen doing strenuous outdoor jobs such as hot-air ballooning. One of the whitewater rafting guides had done construction work installing for Prince Bandar, the legendarily insidious Saudi ambassador, a dead man’s switch to blow up any suicide truck bombers out to assassinate him.
They spent 30 minutes discussing how long & wide were the strips of bacon on various Denny’s-type diners’ breakfast deals.
These guys were not in danger of obesity. Unusual in modern America, they were, for good reason, hungry all the time.
Workers in Aspen need all the protein they can afford.
I’d be interested if there are obesity differences among, say, wheat farmers on the Great Plains living at 1,000 feet of altitude versus 5,000 feet of altitude. That would be a good apples to apples comparison to see if the difference in obesity is environmental rather than cultural.