I keep on reading about people living in the Northern Hemisphere who warn their children not to get their feet wet or else they will "catch the death of your cold". Is this really true? I mean will they catch cold? If so, why? Because in Australia, I can stand in the rain and not catch cold. I play footy, and it rains, and its autumn, but I don't get sick. However, when I play, I don't get my feet wet. Do you really catch cold if your feet get wet? And if you get wet but your feet don't, will you still become sick?
Colds are caused by viruses (over 200 types). There are lots things which increase the chance of you getting a cold which include:
- Touching your face with contaminated fingers.
- Spending lots of time in enclosed, warm, moist areas with other people. (This is the main reason we get colds in winter—because we spend lots of time indoors).
This study by Claire Johnson and Ronald Eccles entitled "Acute cooling of the feet and the onset of common cold symptoms" concluded
Acute chilling of the feet causes the onset of common cold symptoms in around 10% of subjects who are chilled. Further studies are needed to determine the relationship of symptom generation to any respiratory infection.
And in fact some further studies do show such an relationship.
...most of the available evidence from laboratory and clinical studies suggests that inhaled cold air, cooling of the body surface and cold stress induced by lowering the core body temperature cause pathophysiological responses such as vasoconstriction in the respiratory tract mucosa and suppression of immune responses, which are responsible for increased susceptibility to infections
To me it seems that being cold makes your body weaker in some ways, and less able to deal with viruses. But it is not the low temperature that directly gives you a cold, it is still a virus.
That said, according to this book, people with very strong immune systems are more likely to develop symptoms of a cold because the symptoms are due to the way your body fights off a virus. The harder it fights, the worse your symptoms.