Human Anatomy, Physiology, and Medicine. Anything human!
Blood (not human) is used as food in many cultures. Examples include blood sausage, ducks' blood soup and "blood tofu" (congealed blood cut into cubes and used in stir-fry). Heating the blood via cooking would deactivate any bacteria, viruses or parasites.
Oh, my earlier answer of a bit more than 400 calories was for a standard U.S. donation of 500 ml. So a liter's worth would be twice that.
gayoc - yes, very little from the glucose in blood, but you have to also count the protein and fat content. Most of the calories are from the protein.
I agree with DavidnotMD.
The Masai tribe in Africa drink raw cattle blood.
I'm here looking for the calories in blood because I love black pudding (which is made from mostly cooked pig blood and cereal). Thinking eating it grilled would be ok as blood itself didn't have calories. Obviously I was wrong. Back to the low calorie diet drawing board...
I think you are too certain in your condemnation of the person asking question. There is another explanation for the question. While giving (donating) blood, I have often wondered how many calories I am loosing during the donation. This is certainly something the blood bank might be interested in advertising in order to incentivize donors if they knew how many calories they were getting rid of. Sounds Ike it is the equivalent of running 2 km!
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