>brain needs glucose, can't fuel any other way
Not so: the brain can be fueled by ketone bodies, which the liver can create from fat.
P.S. I agree with your larger point that avoiding all carbs for many days at a time should only be done by people who have informed themselves of the risks (acidosis and kidney stones).
Re:Always Hungry? Here’s Why
by mixmastamyk on Sunday May 18, 2014 @03:51PM
(#7764140)
What did humans do before large numbers of carbs were widely available? Die of kidney stones? Or perhaps this is because modern people have become accustomed to them being available?
There is carbs in vegetables. Beans too. Just not as much in most of them as grains.
If you are "tapping for burst fuel" why are you worrying about your diet (apart from the sensible am I having good things enough worry...) Surely these diets are aimed at people who need to loose >10% of body weight ?
The main points being (1) brain needs glucose, can't fuel any other way (2) glucose is needed for maximum muscle response so if you are fit/athletic in any way you can be short-changing your performance if you have no glycogen stores to tap for "burst fuel"