The prevailing theory out there is the following:
I'm just not sure the relevance to MAF base training, which is about developing the ABILITY to use fat to process oxygen (faster and faster with aerobic fibers). There is a mentionin the article that at low intensities, cabs will inhibit fat-burning, and no effect at higher intesities. Perhaps that is where warming up comes into play.
I put in an email to Dr. Maffetone for his view. Hopefully he'll get back to me. I couldn't find a specific refernece in his books for this topic.
Running Log Crusted Salt #214
The above article was one of my influences on my decision to not train with carbs, nor to eat them before. As I've said before, during a run I never bonk, I never feel hungry, even on days with no breakfast and runs up to 22 miles. As McMillan suggests, if someone decided to go in this direction, he or she might want to wean --not just go from eating to no eating.
This advice contradicts the research in the other article. The one thing missing in the former article is the mention of muscle glycogen as fuel.
Anyway, I'll report back if I get an answer from Dr. Maffetone.
Future running partner.