Why Drinking Cold Water Makes You Sick
Image Source: http://www.thehealthsite.com/diseases-conditions/cold-water-po0315/
This was always bothering me; why would drinking cold beverage or eating an ice-cream would make you sick? Was there a microbes inside cold water?
In order to understand what happens, lets move little back and check basic physical principle concept.
As you might know, all materials expand and contract with addition and removal of heat. In other words, their length vary with temperature gradient.
Fun fact about that; Eiffel Tower's height vary 6 inches between summer and winter seasons.
So, basically, Length change with temperature.
It turns out, your throat just follow exact same principle. When you introduce cold water at your throat, it basically shrinks your blood vessels at that area.
Your body is capable to send immune cell to high foreign microbial activity areas. However, when your blood vessels shrinks, your body cannot send enough immune cells to protect you. As a result, you get local infection and high microbial growth at that area, then it just spreads to your whole body and you get sick !