Dual wield escalipoor excalibur . <| sep |> Since the brain is more than neuron ~ 75 %, my initial thought was to argue with your concept based on what was about to be a really crap use of statistics . Losing stuff and moving closer together didn ' t seem like it would explain how apparently none of the original data is lost in the process . I was thinking that the loss of something huge like 4 % would have to be more glia than neuron if the article is correct about a complete return to normal if oringinal functionis haven ' t been lost once it restores to originalfull size , it seems to me like more than the usual ratio of the upkeep cells have got to be missing than the primary signal node cells . Was going to use a dartboard throwchance example as a dumbassed basis for a halfassed post , but in th process came up with a guess as to how your nearerfaster idea could play out . Can ' t really infer which glia would go and why , but finding this bit seemed cool Ependyma is one of the four types of neuroglia in the central nervous system CNS . It is involved in the production of cerebrospinal fluid CSF , and is shown to serve as a reservoir for neuroregeneration . They also serve a stem celllike role , so with more fuel being used and more effective embryonic stem cells in production , maybe a ton of this kind is being burned up for fuel and not replaced until after birth ? I ' m probably oversimplifying it all because I have a simple man ' s understanding of glialeverything . Also , there ' s enough on the Wikipedia Glia type summariestheir pages for anyone to potentially play neuroSherlock and make a better guess than mine .