This is consistent with the Cholinergic hypothesis[1] of Alzheimer's disease. Also, note that the various hypotheses for Alzheimer's are not really "competing", so this doesn't mean that the more recent lines of research are any more or less valid.

Alarming stuff! I've no problem giving up Benydryl, but my partner takes Disiprimine,and it's the only drug she's found that works well for her depression :-(

[1] https://en.wikipedia.org/wiki/Alzheimer%27s_disease#Choliner...