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But energy has been good and I am close to my pre-diet performance levels 
now having run a 23:58 (7:45/mile) 5K with relative ease yesterday morning.

Jim,
I'm at a loss to understand the running.  Why pound your bones into the 
ground?  I'm not so sure this is a good thing.  I think paleo man didn't run 
unless he HAD to.  The wear and tear on ligaments, tendons, joints, bones 
will catch up to you.  Lifting is more advantageous for bone maintenance and 
lipid profiles in my own experience.  Oliva, who loathes cardio.