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Physically speaking, as you are actually donating the blood... about 50 cal. you are just sitting there, so no exertion.

But the actual loss of one pint of blood followed by the body working overtime to replace the blood cells equals about 600-650 calories!

So you burn about 650 cals donating blood, and you save lives! Whoohoo!

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15y ago

What else can I help you with?