This plan is obviously focused on the Umstead 100 race, but is valuable for all ultrarunners. I hope this answers some of your questions or fears. The traditional sources of carbohydrates are rice, pasta, and bread. Preparing for a marathon, after all, is no easy thing. I travel a lot, always write nice reviews for places but this has got to top them all, even worse than the Webb Motel in Ottawa.
I've since seen sense (IMHO) and am doing another mara training prog at the moment based on 2-3 runs a week tops and a couple of x-training (not counting cycling to work .