Actually, the body normally regulates temperature by controlling blood flow.
When it is hot, blood flows to the limbs, and closer to the surface of the skin, where heat can escape. When it is cold, it restricts blood flow to the head and torso, keeping vital organs warm, and significantly slowing the rate of heat loss.
The body does not generally burn extra calories in the cold. Only when you are so cold that you start shivering does this happen - basically the body is trying to generate heat through involuntary muscle movement.
So having a cold shower, or drinking cold water to burn more calories, is a total myth.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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