Hi Rick, hope you are keeping well.
Yes, remember I posted "More on the BBB" where I mentioned these compounds can also disrupt the BBB.
If the link does not work, try
http://dorway.com/dorwblog/?page_id=47

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Interesting paper dealing with the safety of MSG and aspartate in foods, in which more evidence is cited that the BBB plays a significant role in PD. Maybe the different amounts we each eat of mono sodium glutamate (MSG) and aspartate, account for our differing symptoms, due to a different level of BBB dysfunction.
See
http://new--start.blogspot.com/2008/...eneration.html
where it says,

An additional critical factor ignored by the defenders of excitotoxin food safety is the fact that many people in a large population have disorders known to alter the permeability of the blood-brain barrier.

"It is logical to assume that patients with the other neurodegenerative disorders, such as Alzheimer's disease, Parkinson's disease, and ALS will be made worse on diets high in excitotoxins. Barrier disruption has been demonstrated in the case of Alzheimer's disease.46" Problem is identifying the foods that contain them, not so easy if you eat out. It really needs legislation to stop it.
Ron