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How many calories in blood??

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How many calories in blood??

Postby mr bollocks » Mon Jun 13, 2005 10:31 am

how many calories are there in a litre of blood? for comparison heres a list of the content of some other drinks (per litre):

fruit juice - 400
skimmed milk - 350
full fat milk - 700
water - 0
olive oil - 850
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Postby biostudent84 » Mon Jun 13, 2005 1:01 pm

I wouldn't think there would be nearly that much. Thrombocytes (red blood cells) don't do much that require energy. They are moved around the body through mucsular pumps (the heart), and the process of oxygenating or deoxygenating does not require energy.
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Postby MrMistery » Mon Jun 13, 2005 7:15 pm

ok... i'm a little confused Kyle.... First of all, from what i know thromocytes have a role in coagulation, red blood cells are erytrocytes.
Second, wasn't he asking you many calories would blood have as in if you were going to drink it?
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Postby mith » Mon Jun 13, 2005 7:22 pm

I think he's saying that if red blood cells required much energy, there would be more energy available in the bloodstream or the cells themselves would have vast reserves.
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Postby MrMistery » Mon Jun 13, 2005 7:29 pm

Yes that is logic enough... but i don't see how it goes the other way... Why can't the blood have a lot of calories even if red blood cells do not need a lot of energy?
I think it should have some calories because it contains cells(which give you energy when you digest them), nutrients, hormones(which can be proteins or lipids so also give energy). Let's not forget hemoglobine-it should give a few calories
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Postby biostudent84 » Mon Jun 13, 2005 7:39 pm

MrMistery wrote:Yes that is logic enough... but i don't see how it goes the other way... Why can't the blood have a lot of calories even if red blood cells do not need a lot of energy?
I think it should have some calories because it contains cells(which give you energy when you digest them), nutrients, hormones(which can be proteins or lipids so also give energy). Let's not forget hemoglobine-it should give a few calories


Because where red blood cells don't DO all that much, they don't need to have much stored energy. The overwhelming bulk of energy that we get from ingesting food is from already created and stored sugars and fats. Where red blood cells don't need all that much of stored sugars and fats, there would be little energy a human could get out of drinking blood.
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Postby b_d_41501 » Mon Jun 13, 2005 7:44 pm

Unless you're a vampire. lol :twisted:
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Postby biostudent84 » Mon Jun 13, 2005 8:15 pm

b_d_41501 wrote:Unless you're a vampire. lol :twisted:


Even with people who call themselves vampires.....as well as vampires in legends......drinking blood is not really for sustenance. The practise is said to drain the "life force" into the vampire. They see it as sucking the soul out of the person, rather than simply drinking blood.
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Re: How many calories in blood??

Postby DavidnotMD » Wed Sep 08, 2010 4:21 pm

There are approx 425 calories per standard blood donation of 500 ml for women, 460 for men. Men calculate higher because they have a higher red blood cell content than women. To see the details of the math, search eHow for "calories human blood."

The calorie analysis is based on the protein, carbohydrate and fat content of the components of blood. Some of the substances in blood (cholesterol, heme) do not get broken down to calorie generating compounds.

The calorie cost of replacing these components would be higher, but not a lot higher.
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Postby Julie5 » Thu Sep 23, 2010 5:12 pm

Wouldn't the blood in the hepatic portal vein have the most calories, as it carries the most food (ie, highest concentration)?

If so, maybe vampires are sucking in the wrong place!
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Re: How many calories in blood??

Postby gayoc » Fri Oct 08, 2010 7:45 pm

It is supposed to be 5 grams of glucose circulating in our blood. And in 1 liter of blood, it contains 1 gram. So blood definitely contains calories on this analysis.
Last edited by gayoc on Sat Oct 16, 2010 11:24 am, edited 1 time in total.
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Re: How many calories in blood??

Postby Wilddwarf » Mon Oct 11, 2010 5:07 pm

You all seem to be taking this rather well. This guy is asking how many calories there are in blood. Why else would you ask the calorie content of something unless you're considering consuming it. That seems the most logical conclusion. If so, this guy is real messed up. Drinking blood is just plain nasty. Getting the blood would either involve killing people or animals, or stealing it from a blood bank. It's also demonized in many religions, for very good reasons, and it can transfer diseases. Oh, and I almost forgot:
how many calories are there in a litre of blood? for comparison heres a list of the content of some other drinks (per litre):
He's referring to blood as a drink. What more do you need to be suspicious?
It is naive to think that the whole universe must conform to the sciences devised by the inhabitants of a single planet.
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