I'll post the link to that quote shortly but I wanted to put the context out there first. One of the leading indicators of severe outcomes for COVID is obesity. However; you'll see in the media vaccine PR stories a lot of people who are not "obese" as we typically understand it. Well here's the reason:
I've known this for a while. Personally I decided last year to start intermittent fasting (16:8) because I could not lose some belly fat. I couldn't understand why I couldn't lose it given the amount of exercise and running I did. Well we're a year on and I dropped 15 lbs (and lose about 5lbs of water during my long runs). Yes, the belly fat mostly went away. And yes, 15lbs on my body is a LOT.
Now looking at me before you'd think I wouldn't have weight to lose, but it happened.
In short a lot of "skinny" people think that because they are skinny that they are healthy. A lot of them are not and when COVID hits, a lot of them find out the hard way.