On Wed, 7 Jan 2004 10:41:01 +0100, Paul Sand <[log in to unmask]> wrote:

>>From: Amadeus Schmidt <[log in to unmask]>
>>But only for 50% of the brain's energy, as I read.
>Where have you read this?

Here on the list a couple of times - in related articles.
There are some tissues which require glucose as the obligate food.
Brain cells - red blood cells and some kindey tissue.
Brain cells can be trained to switch to fat in a few days - but only partly.
Net glucose requirement of all thes tissues is around 500 kcal -- while
beeing in ketotis this could decrease to around 200 kcal
(thats about the 60-80 g carb in ketosis).

But brain cells and some other need glucose essentially -
and glucose levels *never* drop below the a low limit - or the brain dies
in a few minutes (hypoglycemie).

hello from my holidays

Amadeus S.