I think you were somehow debating with Alex A about Dave's regimen, which somehow drastically cuts your body's intake of glucose and then you stated this:
When your brain gets starved like this you're right, it is tough, you feel very lethargic, kind of spaced out, etc. Everyone knows what it feels like to have your blood sugar drop...it's not fun. But here's the deal, if someone puts up with this for a few days, usually 3-4 max, that uneasy feeling goes away...you end up feeling better then before...very even feeling, more then enough ability for concentration, etc. But that's the thing, most people can't or simply aren't willing to give it the 3-4 days needed.
I need to interject and disagree with your comments, feel free to speak to Dave about this and have him shoot a response my way. I can be wrong, but just taking a shot in the dark here, let me know if you follow.
The Brain feeds mainly off of Glucose. The brain can not store both oxygen & glucose, hence why it needs a constant supply of it. If you were to reduce your brain's supply of glucose, it would start to feel starved. If your brain starts to feel starved, it will then search for other means of energy.
Now, here is the clencher, if the brain's metabolism suffers from such a drastic disturbance (subjecting it to such low levels of glucose), it would then naturally convert to anaerobic metabolism. The sodium pump will fail and sodium will enter the cell and pull water from the extracellular space. This will lead to a serum sodium decrease and as a result an abnormal accumulation of fluid in the brain cells follows as well as a decrease in the extracellular fluid space. All of this leads you to developing cytotoxic edema, which will cause an increase in Intracranial Pressure.
With an increase in Intracranial pressure, you can have symptoms like: decreased levels of consciousness, restlessness, irritability,
confusion*, headache, nausea, vomiting,
slurred speech*, change in sensorimotor status, ataxia, seizures etc...
Consequently, there is just no way that your statement can make logical sense, unless I'm missing something in the big picture.
Speak to Dave about it and get back to me,
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1"
P.S. This is not to prove you wrong so much, just to mainly clear my understanding of his practice. Again, I can be wrong and maybe Dave is providing your diet with the smallest amount of glucose before sending your body/brain into hypoglycemic shock, but have him chime in and explain.
P.P.S.
* in my explanation denotes common symptoms that most "Pros" exhibit on a day to day basis when on their pre-contest diets..