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Do you really lose most of your body heat through your head?

hi-cold-weather-01968071.jpgIt's cold out. How cold it feels to you personally varies, but we can put a number on the temperature: about minus 10 on Thursday afternoon in Ottawa.

 

What's less certain is how to stay warm. We've probably all been told to put on a hat when we step outside on a day like this -- we're told a large percentage, somewhere between 40-80% of our body heat, is lost through the top of our head. But is that true?

 

We called up Ollie Jay for the answer. He's a professor at the University of Ottawa who studies human survival in extreme environments.

 

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Photo by Jeff McIntosh/Canadian Press

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