What actually differs between blood groups?

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Ken Hughes

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What actually differs between blood groups?
« on: 26/04/2010 11:30:02 »
Ken Hughes asked the Naked Scientists:
What is the actual difference in the blood of the different blood types? 

And would different blood types require different foods for optimal health? 

Thanks in advance for your answer.


What do you think?
« Last Edit: 26/04/2010 11:30:02 by _system »


Offline RD

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What actually differs between blood groups?
« Reply #1 on: 26/04/2010 13:08:58 »
The "Blood type diet" stuff is BS.

the theory is unsupported by scientific evidence. {1}{2}{3}{4}{5}{6}{7}
« Last Edit: 26/04/2010 13:18:45 by RD »


Offline Pwee

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What actually differs between blood groups?
« Reply #2 on: 27/04/2010 09:58:54 »
A cell's surface is not smooth, it has several things (called antigens) sticking out of it a little. These bits and peaces that stick out provide a handle, what the immune system can use to grab or to identify things. These are the things that trigger an immune response. Things that can grab these antigens in the immune system are called antibodies.

What stick out on the surface of a red blood cell is genetically determined. There are many things that stick out, but the first ones that we discovered were the antigenes of ABO bloodtype. There are people who's red blood cells have A type antigens sticking out on the surface, there are people with blood cells with B type antigens, there are some with both A and B antigens and there are people who have no such antigen of this type.

One of the curious things in the immune system is that for every possible antigen there is an antibody in the immune system. The immune system is programed to eliminate everything that it recognises the antigene of, but the immune cells that recognise our own cells as enemies are sorted out through the immune cell maturation process, so in our blood stream and our lymph nodes there are only immune cells that recognise everything BUT our own cell's outsticking bits and peaces.

The thing is that we can only teach our immune system what is ours and what is not during theire maturation process, after they are released into bloodstream and lymph nodes they are really stubborn.

As I said there is antibodies and immune cells against EVERY possible antigen, we produce immune cells with antibodies against the red blood cell's A type antigen and B type antigen too. Let's say we have antigene A on our red blood cells, then all of the immune cells that recognise A type antigenes are killed through theire maturation, but all of the immune cells that would recognise B type antigenes mature and get out into our lymph nodes and blood stream.
This way if we would get blood transfusion from anyone with red blood cells that have the B antigen, our immune system will recognise it and act against it, they will kill the new blood cells.

I doubt that any normal food would be specifically harmful for any specific AB0 bloodtype people.