I found this from his book:
Consuming 5 grams of carbohydrate (I’ll mention this again in another chapter) about 10 minutes before you train can help a lot with your ability to maintain intensity, by increasing blood glucose back to the normal range. Conceivably,you could even increase this to 15-30 grams of carbs taken during the workout (this only adds 60-120 calories to your diet) as well. If you want to save some of your protein intake and consume it around training (maybe 15 grams of whey immediately before and/or after the workout), this will help to support protein synthesis and limit LBM losses as well.
No, I have found, that the pre-workout carbs actually helps me with fat loss.
I'm doing zero carbs 24/7, so my muscles probably don't have much, if any, glycogen when I train. I like drinking the dextrose during my first warm up set, so blood sugar and insulin are spiking as I hit my heavy sets. Great pumps, and recovery is faster.