Anecdotal, but I think there’s some kind of immunity component. My parents grew up in a mosquito infested country. When we visited said country, us kids were bitten up while my parents were fine. If it was genetics, you think it would’ve been passed on to us. The locals commonly joked that mosquitos like “new blood.” You could see tourists with itchy red bite reactions while the locals were fine.
Potatoes when cooked then cooled actually greatly lowers the glycemic index, so it’s weird but actually not a bad habit to have!