How many calories in blood??

[mr bollocks]

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

[biostudent84]

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.

[MrMistery]

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?

[mith]

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.

[MrMistery]

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

[biostudent84]

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.

[b_d_41501]

Unless you're a vampire. lol

[biostudent84]

Unless you're a vampire. lol

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.