Dr Olney MD
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Olney, J.W. "Brain Lesions, Obesity, and Other Disturbances in Mice Treated with Monosodium glutamate." Sci. 165(1969): 719-271.

In his experiments Dr. Olney found that high-dose exposure to MSG caused hypoplasia of the adenohypophysis of the pituitary and of the gonads, in conjunction with low hypothalamic, pituitary, and plasma levels of LH, growth hormone, and prolactin. When doses below toxic levels for hypothalamic cells were used, he found a rapid elevation of LH and a depression of the pulsatile output of growth hormone. In essence, these excitotoxins can cause severe pathophysiological changes in the central endocrine control system. Many of these dysfunctional changes can occur with subtoxic doses of MSG. One can speculate that chronic exposure to these neurotoxins could cause significant alterations in the function of the hypothalamus, including its non-endocrine portions.
Excitotoxins by Russell L Blaylock MD, page 263