I'd also like to suggest that you avoid glutamate. This neurotransmitter is the culprit that causes brain cell death.

Monosodium glutamate is an artificial synthetic form of it that floods the nervous system in an unnatural way and causes nerve problems. People with peripheral nerve damage often get more pain when eating this in food.

There are natural forms of glutamate in our foods, like Parmesan Cheese, but it is bound to organic compounds and do not flood our blood stream when eaten like synthetic MSG does.

MSG is in alot of things. It is best to avoid soups/stews at restaurants. Chinese food especially contains it and often even when you request no MSG, you will get it. If you feel headache or blurred vision after a restaurant meal, that is a sign there was alot of MSG in it.
Some processed food makers like Lays, have lines of "natural" chips (potato or corn) that do not have MSG added. But most of the flavored types like Doritos etc, are filled with MSG.