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An article by Robert O. Young
http://articlesofhealth.blogspot.com...on-part-2.html
in which he says,

"The blood brain barrier (BBB), which normally protects the brain from excess glutamate and aspartate as well as toxins, 1) is not fully developed during childhood, 2) does not fully protect all areas of the brain, 3) is damaged by numerous chronic and acute conditions, and 4) allows seepage of excess glutamate and aspartate into the brain even when intact.

The excess glutamate and aspartate slowly begin to destroy neurons. The large majority (75 percent or more) of neural cells in a particular area of the brain are killed before any clinical symptoms of a chronic illness are noticed. A few of the many chronic illnesses that have been shown to be contributed to by long-term exposure to excitatory amino acid damage include:

* Multiple sclerosis (MS)
* ALS
* Memory loss
* Hormonal problems
* Hearing loss
* Epilepsy
* Alzheimer's disease
* Parkinson's disease
* Hypoglycemia
* AIDS
* Dementia
* Brain lesions
* Neuroendocrine disorders"

Ron