That'd be a BMI of 47. There isn't a lot of statistical data for such high BMIs, but [1] lists prevalence of BMI>40. In Germany 1.2% of men and 2.8% of women had a BMI over 40 in 2011, in the US it was 5.6% and 9.7% respectively in 2016. That's nearly four times as many as in Germany.
Most of the industrialized west is following very similar growth curves here to the US. America just got their first. Even Asia isn't immune - Korea has been following similar trends, as have parts of southeast asia, etc.
I suspect the prevalence of GLP-1 class drugs will halt this trend before the rest of the world catches up, but without them or similar drugs, I would have bet that 50 years form now much of the rest of the world would look just like America
Which has to be a pure coincidence, since the reported numbers are relative to population size. We could conclude that there are 4x4=16 times as many people with such high BMIs in the US, but that is not that useful
That'd be a BMI of 47. There isn't a lot of statistical data for such high BMIs, but [1] lists prevalence of BMI>40. In Germany 1.2% of men and 2.8% of women had a BMI over 40 in 2011, in the US it was 5.6% and 9.7% respectively in 2016. That's nearly four times as many as in Germany.
1: https://pmc.ncbi.nlm.nih.gov/articles/PMC7078951/