Educated guess. US is the only white nation in the top 30 for obesity, maybe top 40 depending how you argue. List of heaviest people in history are dominated by US. Where did tv shows shows like the biggest loser or my 600lb life originate?Food supply + serving sizes that don’t exist anywhere else in the world. AI tells me almost half the population is obese, around 10% severely obese. And the general negative stereotypes that Americans are fat, same as arabs = terrorists, Asians = bad drivers, Brits = bad teeth etc etc.