Excellent question. I am playing around with a modified anabolic diet, known as (the moderate version of) the Metabolic diet. It was developed by Dr. Mauro DiPasquale and is detailed on his website www.metabolicdiet.com. I think that it is important to periodically refill one's muscles with the glycogen that carbohydrates contain, but I don't think that it must be after a workout. More specifically, he proposes that you stuff yourself with carbs over the weekend, and then do your heavy lifting early in the week while there is still ample glycogen.