Originally Posted by howsteepisit
However, you can train yourself to better mobilize fat stores by riding at the edge of glycogen depletion. That's one of the basis of a ketogenic diet, and why it takes people days to weeks to adapt to a ketogentic diet. It takes time to get the enzymatic pathways fully built up to use fat. You still will not be able to work out at a very high level, but you can do OK. I used to run 4-6 miles daily on a ketogenic diet, but it had to be relatively slow.
yeah, due to the maximum rates of lipolysis and fatty-acid uptake, there's only so many calories/hr you can generate this way. It's certainly is one way to lose weight, but yeah, you're certainly not gonna be moving very fast. Still faster than bonking though...