The New York Times has an article on the various form of glutamate that are added to food around the world. The one we know and love is known as the chemical monosodium glutamate (MSG) synthesized by Tokyo University’s Kikunae Ikeda in 1908 (yep, one hundred years ago). So go out and celebrate with a bag of nacho cheese flavored Doritos® today. As the author points out, those have FIVE different forms of glumate in every bag!
Do you know Dr. Maoshing Ni? He is the author of several books on health and longevity and runs the Ask Dr. Mao site.
He has a list of tips on boosting your brain power on the yahoo site. Useful tips include doing some brain exercises like puzzles and memorizing items in a list; getting enough sleep (and grabbing a power nap) and exercise; eating the right foods; brewing your own herbs; and drinking green tea every day (I’ve got mine right here! 
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I would add to the list the fermented foods like natto and miso. What do you do to keep your brain healthy?
This is probably the most readable and practical article on nutrition, or more accurately, nutritionism, that I have ever read. Reading it will require free registration, and waiting more than The New York Times’ limited reading time (it’s a week or two) will require a fee. Read it now, and enjoy your balanced meal without gorging yourself. Great job, Michael Pollan!