Okay, this is something I've done a lot of research about, and in my case I've solved it completely.
First off, telling someone to change their diet doesn't work when they have brain fog, a change of diet actually requires concentration sustained
over time and you're not thinking clearly enough to really do that, in all likelihood. Brain fog and will power are mutually exclusive, ask me how I
Thinking clearly and rationally requires a certain brain chemical in adequate amounts, acetylcholine. It's one of the neurotransmitters and it's
the one that makes you feel wakey, clear headed, rational and analytical. In other words, it's the exact opposite of sleepy and ready for bed, or
If your levels of acetylcholine are not high enough, you'll be brain foggy.
It's easy to raise the levels; get yourself some over the counter lecithin pills; they come in either soy based or sunflower based, sunflower is
slightly more expensive and probably a better option for various reasons that don't matter now. Just get what you can afford. A month's supply is
maybe 10 to 15 bucks in the US. Lecithin is about half choline, which you need as a building block to create the acetylcholine in the brain. You
*could* eat high choline foods like egg yolks, etc, but this is a nice direct route without much calories or cooking involved.
Take one at first in the morning just to make sure there's no untoward reactions, and then if you feel fine, try two in the morning. The effect is
rather subtle at first but you should notice within 20 minutes (and building over a few days' time) that you feel more awake, analytical and just
plain have about 20 IQ points more readily available to work with. Don't take it at night or you'll have trouble sleeping. It's the exact
opposite of the serotonin-melatonin cascade effect that prompts your brain to sleep. The effect of the morning's dose will carry over nicely all day
long; I sometimes take two more later in the day if I'm going to be in a high pressure, verbally taxing situation, like a meeting with lots of people
requiring lots of talking, or giving a presentation or some such, even a party that I want to be up for.
Other more complicated supplements you may want to look into include DHEA, Keto-DHEA, pregnenolone, high dose Vitamin C (see the excellent discussions
of that here on ATS), adequate vitamin D intake, and on line search for 'smart drugs' or 'nootropics'.
I personally would not be without the DHEA, pregnenolone and various vitamin supplements but you need to get your head clear enough to start with so
you can do more research. The lecithin should help you get there.
I would add in that make sure you get enough exercise, especially if your job is cubicle oriented, avoid fluorescent lights (they're poisonous as far
as I'm concerned, our eyes and pituitary gland are NOT adapted to that wavelength at all), make sure your blood is oxygenated regularly by short
walks. Lower your intake of carbs and especially sugars and wheat. Get some sunlight every morning, your pituitary depends on it to not feel like
you're in hibernation mode.