interesting that Coeliac and B12 deficiency are often linked. The commonality with PD is Braak. Also overgrowth of yeast infection and h. pyelori. et.c

Such things are rarely looked at together. Neuros rarely see people with PA/B12def and don't recognised it. Coeliac is rarely looked at by neuros though it can cause some crossover symptoms. Gastric imbalances get referred to a gastro specialist, and cognitive problems are rarely traced to them.

One day I think this will become clear. All of these conditions give physical/cognitve/mental often devastating issues.

Theres a few other things too. No one looks at long term infection. Yet I know of two people with neuro types diseases, one had typhus antibodies, the other now being treat for tapeworm, after 18 YEARS of decline.

Medicine doesn't know everything, it ignores half of what it knows, and it doesn't always ask the right questions.