Obviously, diseases like the cold and flu are cause by viruses, so weather alone wouldn’t cause it. So why do we get runny nose, sneezing, and other symptoms when we go out in the cold without a jacket?
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You won’t find this in literature, but humour me. You have only so much energy in the body. A lot of that goes to cell restoration, metabolism, heating the body etc. Part of that goes to immune defence. When you expose yourself to the cold, more of your available energy needs to be spent on heating yourself, so less is available for immune response. Therefore your immune system is somewhat less effective.
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