The following excerpts are from Excitotoxins: The Taste that Kills Chapter 4"Glutamate type-neurons control every neuroendocrine function of the hypothalamus. This neuroendocrine function is designed to control the thyroid gland, adrenal glands, reproductive functions, gonadal function, body growth, and certain aspects of metabolism. But in addition, glutamate controls all the other functions of the hypothalamus, such as the biological clock, the autonomic nervous system, sleep-wake cycles, hunger and satiety, the emotions of anger and rage, and even consciousness itself.
"So we see that anything that disrupts or impairs the normal functioning of the hypothalamus can have devastating effects on the organism as a whole. Early exposure in life to high doses of glutamate, or the other excitotoxins, could theoretically produce a whole array of disorders much later in life, such as obesity, impaired growth, endocrine problems, sleep difficulties, emotional problems including episodic anger, and sexual psychopathology.
"Whether such changes would be reversible or not depends on the dose of excitotoxin given, the timing of the dose, and how long the child was exposed to high doses of excitotoxins. As for timing, we know that for glutamate, the earlier the exposure to the toxin, the more likely is permanent damage. If exposure is delayed until several years after birth, the injury may be less severe. It is also possible that some neurons are injured but not killed. We know that subtoxic concentrations of glutamate can alter the function of hypothalamic neurons without destroying them. Also, earlier exposure would increase the likelihood of abnormal wiring of the circuits within the hypothalamus. So parents, it is important to stop your child's exposure to excitotoxins now!" (Blaylock, 88)
To read more, see Developing Brains II