>>14497606
Glutamate is found naturally in many many many foods. In fact I don't know why you linked that article because it said glutamate is a necessity for learning and development of synapses.
>Glutamate is a pivotal transmitter in the brain, the crucial link in circuits involved in memory, learning and perception. Too much glutamate leads to seizures and the death of brain cells. ... Too little glutamate can cause psychosis, coma and death.
>Glutamate occurs naturally in protein-containing foods such as cheese, milk, mushrooms, meat, fish, and many vegetables.
Like how your body cannot function without sodium, but too much can lead to seizures.