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Mikel Vsauce (Vsauce youtube channel) said in his video that it takes about 5 years for the body replace all of its atoms, while in asapscience youtube channel they are claiming that it takes 10 years. I am confused and I can't find anywhere the precise time it takes.

Mikel's video (minute 1:14) AsapScience video (minute 1:07)

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It would have been nice if there were some references/studies for that claim. I'm not sure for example if DNA in neurones in CNS (i.e. brain) get replaced unless its through DNA repair mechanism but still, that claim should be viewed with some amount of scepticism until a study is put forward and the assumptions are clarified! –  Bez Aug 14 at 19:06
    
quora.com/… –  Doc Aug 14 at 21:21
    
I also imagine atoms in the bone mineral that sets in the actual matrix doesn't change too often. –  Atl LED Aug 15 at 3:51
    
I expect this to have a mathematical model resembling a half life. Bone turnover is significant. Bone remodeling is part of the normal mechanism for responding to physical activity. Bone loss in space is also significant doe to this effect. cjasn.asnjournals.org/content/3/Supplement_3/S131.full –  mattkaeo Aug 15 at 7:35
    
I don't think Iron would be totally replaced because we can't excrete it well. The iron in our red blood cells is very efficiently recycled by macrophages, and excess iron is stored in hepatocytes. If you really have too much iron it will accumulate as hemosiderin in hepatocytes, which is almost irreversible. The best way to treat iron overload is through regular blood draws, which is a non-natural way to remove iron, I don't know if men have a natural way to remove excess iron, so if the atoms can't leave, they can't be replaced. –  user137 Aug 15 at 18:00

1 Answer 1

No. Some structures in the body are ever present from birth to death. The first things which come to mind are nerves, the eyes, the auditory hairs in the ears and the list goes on.....

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could you please reference this! I tend to agree with you but over time replacement at molecular level is not inconceivable for any structure in the human body hence it would be nice to get some solid references! –  Bez Aug 15 at 16:36
    
Sure but I have not ate today so I am hungry it will be a while –  caseyr547 Aug 15 at 16:40
    
I don't know about this. While it's true that cells in many parts of our body don't divide and have to last our entire lives, the atoms in those cells might be turned over. While the same neuron may last for 80 years, it will have to make some repairs to the membranes, DNA, proteins, etc. Whether or not this happens quickly enough to get total replacement within a human lifetime I can't say. –  user137 Aug 15 at 17:56
    
@Bez i added references...if you would like citations that is possible too. –  caseyr547 Aug 15 at 23:17
    
@user137 no it does not atoms are extremely tiny there are just too many of them. –  caseyr547 Aug 15 at 23:18

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