>>>> I'm wondering... All those absurdly fat people? Would they even *need*
>>>> to eat?
>>> Brains don't work from fat. They *need* sugar.
>> ...which is why the liver metabolises fat into sugar?
> 
> Hmm... I recalled that if sugar was high, the liver converted sugar into 
> fat, but if sugar was low, it didn't convert fat back into the same kind of 
> sugar, and neurones notably couldn't use that.
> 
> I must be mixing it up with something else...

http://en.wikipedia.org/wiki/Fatty_acid_metabolism

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