I never saw this post; glad it's here. This is not news to me but since the medical cartel ignores this common issue which can become life-threatening, WE must always be on the lookout for such issues. I read this Could It Be B12? https://u1lib.org/book/1191911/6718e2 (pdf) or https://u1lib.org/book/5470120/37b632 (epub) a couple of years ago during a dive into normal pressure hydrocephalus--which my Mother had--and found a couple of other books that were a treasure trove of information that were related.

The other book I found was The Methylation Miracle--written in 1999 but also a wonderful explanation of the importance of methylation in our health. I have a genetic issue with the MTHFR defect and it explains some of the problems that I've encountered. This book is not available for download except at Barnes & Noble as an ebook. I did, over time, put it into a doc format and then pdf if anyone really wants to read it.