Same reason why in cases of beginning hypothermia, extremities are colder and periphrial pulses are weaker. Body is sending Blood to the core and brain to preserve core temp and oxygenation of vital organs. Blood flow is the thing that keeps body tempature up.
Same reason people say you shouldn't drink alcohol out in the cold because alcohol dialates blood vessals causing a drop in circulation, which causes a drop in tempature, which increases the state of hypothermia. However in alcohol's deffense, those people are pussies
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