Young bone marrow rejuvenates aging mouse brains, study finds
Just more evidence that exercise and fitness stave off and prevent cognitive decay. But now there's an actual mechanism uncovered.. youthful vigor reduces the activation of microglia, which typically serve to prune and cut neuron connections in the brain (a typical, mostly healthy brain immuno response- cleanup essentially), including ones in the hippocampus which is the area of the brain associated with memory. Seems it's also got something to do with the structure of the microglia themselves. More youthful ones have smaller bodies with longer branches shooting off producing their own branches. Interesting.
Of course as it seems most of medicine these days is not preventative but rent-seeking, we're going to end up having people that just want to take the easy, vampiric way out. Literally. Vampires will come of this