I wholly disagree that doctors are wrong in their approach that eat less, move more. I've said before, and I still have full respect on how you lost weight, just because it worked for you, it doesn't mean it is right for everyone. Your "stats" however, how about the entire population of Japan, with only 4% obese (and that is 25% BMI for that matter), would suggest that they are not all on a high protein and no carbs diet. Before people go, but genetics! Genetics can only take you so far, people in Japan just move more. Even those work in the office, why? Because most Japanese don't drive due to lack of space, they take public transport, and accommodation within a 15mins walk to any train station would considered to be close and therefore, more expensive. It is quite normal to walk 20+ mins to the station for your first train, and then change, and then walk some more, another train and then walk another 10mins to the office. By the time you get to the office you probably walked about 3km.
By luck or by design of the way they live, they simply move more. When I go there to visit, even though I picked a hotel practically next door to the station, by the time I get to the platform I walked about 1000 steps already, any the time I get to whatever museum or temple I planned to go to that morning, it would normally be at least 3,000 steps. I normally hit 10,000 steps by lunch time. Last year, in 11 days I clocked up about 150km in walking. It is an inside joke on a Japan travel discord that "Japan breaks your feet".
As I said before, although the line is grey, it isn't an ocean of grey. All those POW aren't skinny because they were on Keto eating nothing but steaks.
p.s. I am currently eating less, moving more, I am down to 88.5kg this morning, down from 92kg from 11 days ago.