I started a reply to the original post saying that insulin is in there somewhere and has an important point been missed. I erased it due to not knowing what I was talking about so your post is of great interest to me.
Because of the high insulin that I was producing before doing very low carb diet, it was clear to me and my endocrinologist, but I found out from Brunneria about how hyperinsulinaemia affects everything when in sufficient quantities to cause the many symptoms which our brains.
But because of the high glucose levels as well as the high insulin levels and insulin resistance, the brain can't function on these abnormal levels.
There are many symptoms that effect the brain, the major one I suffered from was anxiety. Depression, memory loss, forgetfulness, awareness, brain fug, and many others are well known to the specialist endocrinologists that have studied RH.
Even the hypos that effect most diabetics having symptoms that the brain is telling us something is wrong but when you don't know, how can you treat it?
This has been discussed a few times on the RH forum.