Superior genetics, obviously. Oddly enough, we spend billions per year treating inheritable illnesses so that the motherfuckers who have them can survive, so that they can go right on out and have loads of fucked-up babies with inheritable illnesses. And ~80% of the time when you see these differential outcomes it's because one of them has some chronic weakness and the other lacks that chronic weakness.
In my direct observation it's the healthiest friends with robust immune systems that have been afflicted the most while the fat, unhealthy friends are having no problem at all though
A lot of people with good genetics abuse their bodies like that. Let's not mistake Nature for Nurture.
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