Obesity is on the rise globally, not just in the US (though the US is leading the pack). https://ourworldindata.org/obesity#obesity-varies-widely-worldwide-and

Obesity is on the rise globally, not just in the US (though the US is leading the pack). https://ourworldindata.org/obesity#obesity-varies-widely-worldwide-and-has-become-more-common https://ourworldindata.org/obesity#obesity-varies-widely-wor... I don't think we've figured out exactly what's causing it. The simplest explanation is an abundance of easy, cheap calories. Some think it's some unknown/unstudied environmental factor like PFAS. There are various other theories. It's another unsolved billion dollar question.