Is there any proof whatsoever of this? It assumes that the natural behavior of cells in the brain is dysfunctional. Herd culling is a normal part of ecology in that weaker animals become prey to predators. Humans add their own complexity to that natural order of the system.
In the human body cells which are not performing their correct behavior kill themselves. Otherwise they can become cancers.
"Well you see, Norm, it's like this... A herd of buffalo can only move as fast as the slowest buffalo and when the herd is hunted, it is the slowest and weakest ones at the back that are killed first. This natural selection is good for the herd as a whole, because the general speed and health of the whole group keeps improving by the regular killing of the weakest members. In much the same way, the human brain can only operate as fast as the slowest brain cells. Now, as we know, excessive drinking of alcohol kills brain cells. But naturally, it attacks the slowest and weakest brain cells first. In this way, regular consumption of beer eliminates the weaker brain cells, making the brain a faster and more efficient machine. And that, Norm, is why you always feel smarter after a few beers."
In the human body cells which are not performing their correct behavior kill themselves. Otherwise they can become cancers.