I've learned some stuff in my training in the past year though. In training for the race last year, I was too focused on slimming down. I lost 30 pounds, but with it I think I lost a lot of my power. It really comes into effect when you switch from the 56 mile bike over to the run. Unless you really need to lose some fat, I would just focus on building up your stamina for the race. That St. George run, right after a good climb through snow canyon is brutal.
I am just starting up my training for May, and I'm going about it much differently than last year.