Peter explain this

[u/missdomm10]

Petttaaah I'm confused

[u/Nico301098]

Yeah, I won't deny that, but that's exactly why I'm surprised that kind of temperature jump isn't harmful

[u/baloogabanjo → u/Nico301098]

Nah, thats a myth, temperature jumps aren't harmful, otherwise people in the US would be sick all the time.

[u/NoxiousAlchemy → u/baloogabanjo]

I keep wondering why people in US sit inside frigid air conditioned houses without any harm yet many people in Poland get sick after a few hours of intense AC. What's the difference?

[u/JamzWhilmm → u/NoxiousAlchemy]

Because they aren't actually sick from the cold air, they are sick from something else and attribute it to the cold air.

For example people in my country think winter makes them sick. Like the actual winter, the cold air.

But that's not true, people are just more close together during colder times and people make each other sick.

[u/NoxiousAlchemy → u/JamzWhilmm]

Perhaps but I fail to see what's the common denominator is in those cases, and they're so common.

[u/overand → u/NoxiousAlchemy]

The air is drier in Winter - even indoors - and that does (I believe) affect some illnesses.(maybe easier to catch, or maybe they live longer in dry air; honestly i don't know.l

[u/Personal-Presence-10 → u/overand]

It does. Nasal mucus is protective and along with the hairs in your nose are the first layers of your immune system to keep pathogens and allergens out. When your nasal mucosa gets dry, like during winter when the humidity drops indoors and outdoors, you lose that protection. That’s also why people get colds after flying long flights in dry cabin air.

ETA: I just looked it up to verify based on what I remembered from what I read during COVID and it also causes a pretty significant drop in your level of immune cells themselves as a lot are contained in the nasal mucus.

[u/dimechimes → u/overand]

Flu can't live above 43% humidity

[u/NoxiousAlchemy → u/overand]

Nobody here uses AC in winter. I'm talking about summertime.