It's a perfect storm, really. If your manganese theory has any merit, there's that. Then there's the inflammatory fats that CW and vegetarians tend to consume. Then there's the bad cholesterol levels causing them eventually to take statins which have neurological side effects of their own.
The Peat party is really getting obnoxious. But I really don't care if they scare anyone into abandoning the PB diet. People can eat all the pig food they want and I'll eat the pigs.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.