I don’t know if it actually causes a weaker immune system, I just assumed it did. Otherwise the title says it all.
I could add for example why is leaving home early in the morning with wet hair, when it’s cold outside, considered not good because you could get sick.
In: Biology
It’s not the cold per say, it’s what it makes us do: stay indoors crowded with others. This increases transmission. A lack of sunlight in the winter months and being inside causes various levels of vitamin D deficiency for many people, making them be more susceptible to getting sick.
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