How pregnancy transforms the brain to prepare it for parenthood

So you've got to be dumbed down a little to love the little monsters... Checks out.

I read the whole thing, but I am also getting sleepy so I am not sure if I missed it. But did it say anywhere what directly caused the issue? I kept seeing them point to hormones and in theory (if I read this right) most of the brain returns back to normal post-pregnancy but that pre-dispositions for mental illness might be a cause of them not? And that the empathic network of our brain sort of remains scrunched perminantly? This is a poor summary, but that's how all I read it.

But the thing I was wondering if perhaps a nutritional deficit causes it? Because I know that forming a new body can be incredibly invasive. But I don't beleive children are little zombies that siphon brain matter. More so that perhaps that it is a very difficult game to keep up with nutritionally and then long-term malnutirition causes the brain to shrink. But also pain, which I believe I have read shrinks the brain when exposed to an extended time. I know that pregnancy is a series of uncomfortable pains. So perhaps that's a piece of the puzzle? I am not sure, just spitballing here.