Low Energy

I am entering the low energy phase for Paleo newbies. I am craving carbs; Pizza!!!! Beer!!! Sugar!!! and I'm constantly hungry. How is it that I can eat a full plate of sauteed veggies, a chicken breast and drink a glass of wine and be full.. only to be starving again an hour later?
Went short on my run this morning taking into account the energy low. Down 3lbs. At least the headache went away. Drink more water.