If you want to make "the obese" "pay for their externalities", I do hope you have a fantastic plan in place to break the backs of the Nabiscos of the world who literally-not-figuratively design for habituation and drum their marketing into every place they can.

The situation was not caused by overstressed people going "you know, I really want to be fat".

That's the issue though, everyone points out the correlation, but of course there's a correlation. Everyone's overweight. Need more analysis to show just how much it affects COVID outcomes. While it would have been nice for the governments to make more of an effort to get people to lose weight during the pandemic, it's not guaranteed it would have had the results some people expect.