First off, I'd personally lay off the Diet Coke. There is some evidence, thought the jury is still out, that the aspartame in it is horrible for the brain. I think one of the best things you can do to keep the brain healthy is eat more Omega 3 fats. Preferably from fish and/or fish oil. Carlson's Cod Liver Oil is my preference. Doesn't taste fishy at all. Here's some information on how it relates to brain health: http://www.westonaprice.org/...ins/codliveroil.html

While the brain runs totally on glucose, that's not the fuel you want to ingest to keep mental focus (can we say insulin crash). For some people, caffiene will help mental focus, and for others it just gives them nervous jitters. Biotest has a product named "Power Drive" that a lot of people use to keep mentally sharp, though I have no first-hand experience with it.

Omega-3s are a good choice for good mental faculties, and gingko biloba will help keep blood flow to the brain in good order.

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As someone has already stated, its glucose that your brain uses exclusively. I think your problem may be low blood glucose levels by the end of the test because of the type of carbs your eating. From the diet you reported, most of your carbs are simple. Simple carbs means a large insulin response which basically sucks the glucose out of your blood and into your tissues, leaving little for the brain. More complex carbs means a smaller insulin response and your body will maintain blood glucose levels better. I would suggest eating more complex carbs for your lunch and especially for your snacks. NO GUMMY WORMS!

Best of luck.

sorry, that sounded a bit snarky.. but the point is that the protein shake for breakfast isn't food, it's a supplement. Actual food has all kinds of trace elements and nutrients in it that the protein shake can't hope to emulate. Also, there's no fat in there, and fat is actually a necessary part of the diet. Try a throughgoing breakfast of OJ, cereal, toast, eggs, bacon.. The PB&H for lunch is good, add in some fruit &/or fruit juice and skip the caramelized (carcinogenic) soda. Try Powerbars or the like for a snack, they're convenient and not just simple sugar.

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"It is a good feeling for old men who have begun to fear failure, any sort of failure, to set a schedule for exercise and stick to it. If an aging man can run a distance of three miles, for instance, he knows that whatever his other failures may be, he is not completely wasted away." Romain Gary, SI interview

That's not completely true. If there is an adequate amount of glucose in the body (as is the case most of the time) the brain will use glucose exclusively. However, if there is no glucose available, the body will feed the brain with ketones--the fuel left as a result of oxidizing fat. It is possible to survive with an intake of virtually no carbs at all. The Eskimos do it for varying periods of time. Also, if it were true that the brain will only use glucose for fuel, that horrible experience most of us know as "hitting the wall" would result in your brain completely shutting down. Sometimes we may wish it did, but it doesn't. More reading: http://listserv.lehigh.edu/...ic/html/ketones.html