You can acclimate to different environments and temperatures. Brown fat tissue can be increased when exposed to cold temperatures over a long period of time, in a form of adaptation. This type of fat helps produce heat, keeping you warmer.
A couple of years ago for Christmas I left my 80°F December to visit my in laws where the highs were 30°F. I had absolutely no resistance, and it was miserable. They kept their house cold because they were acclimated. I was shivering in my jacket next to the fire the whole trip.
Immunity is a strong word.
You can acclimate to different environments and temperatures. Brown fat tissue can be increased when exposed to cold temperatures over a long period of time, in a form of adaptation. This type of fat helps produce heat, keeping you warmer.
https://en.wikipedia.org/wiki/Brown_adipose_tissue
There is truth to the jokes of Minnesotans wearing shorts on the same day Floridian’s would wear winter clothes.
Yeah I wouldn’t use the word immunity, I’d say you can build up a tolerance.
I am that Minnesota! I’ve been shorts and t-shirt during winter since high school.
A couple of years ago for Christmas I left my 80°F December to visit my in laws where the highs were 30°F. I had absolutely no resistance, and it was miserable. They kept their house cold because they were acclimated. I was shivering in my jacket next to the fire the whole trip.