I just started reading a rather cool book called 'Your Brain At Work' and the beginning is talking about STM. The pre-frontal cortex deals with this and it is incredibly inefficient with energy unlike other areas of the brain. The belief is that this maybe due to the fact it is a relative newcomer compared to the rest of the brain and is still evolving.
It uses lots of glucose for STM, so my highly unscientific conclusion is that when people first go primal it takes a while for the body to switch from carb burning to produce glucose to extracting it from fats. Therefore the high glucose demands needed for short-term memory can't always be met.
Make sense?
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