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As we’re the most obese nation on earth, I’m assuming that will contribute to the mortality rates in a significant way.

You might be surprised on that. Certainly, morbid WalMart-shopper level obesity is a serious health risk, but being overweight may actually help patients get through an acute illness. I did some work with a PhD in Nutrition a while back and he had real data and journal papers on fattening up patients before surgery to get lower mortality. Obese people often do not heal well following surgery because you can't suture fat layers together, so they get infected pockets with low blood flow. That means poor access for the immune system. But nobody gets surgery for Covid-19.