People are seditaty now more than ever. Like 40+% of the US is obese. Fat and joints and health do not go together.

Even Europe is catching up.

Edit: new study is showing 70% for the non-bmi definition.

https://www.massgeneralbrigham.org/en/about/newsroom/press-releases/dramatic-increase-in-adults-who-meet-new-definition-of-obesity

People don't move, eat more food than they need...so yea that's how.