> Americans are fat, through they aren't twice as fat as other people

They are, almost:

"US obesity prevalence was 41.9% in 2017 – March 2020"[0]

"25.9% of adults in England are obese"[1]

[0] https://www.cdc.gov/obesity/data/adult.html [1] https://commonslibrary.parliament.uk/research-briefings/sn03...