Few dozen extra pounds is not what is causing the issues like making surgery or care hard. It's not that there's that so so many (quick search shows 20% of ICU patients are morbidity obese) but that caring for that percentage takes larger amount of the resources. From what my family member tells me, the situation is like this: for issue X you might stay in an ICU bed for Y days. For a morbidly obese patient, the care or operation can take an extra day (need special resources) but worse, they take much longer to heal or be in good enough shape to leave the bed. So they stay in the beds much longer. Basically the same issue we saw with covid: when people stay in the ICU beds longer and longer it quickly sucks up all available resources. Add up all the extra complications needed to care for the obese and that it's becoming more and more common, you start to see the issues pile up.