I remember Mark having a question about that and his response was that it seemed around that time of the month, our muscles more readily store glycogen so that may be a part of the craving?
I'm sure more folks will have answers. Glad to see you're enjoying having gone primal.
Oh, and be sure to check out the journals subforum and maybe start your own.
"The grand essentials of happiness are: something to do, something to love and something to hope for." - Allan K. Chalmers (1759-1834)