New diet and bonking?

[Dogmama]

Also, you can train yourself to run on a higher ratio of fat to carbs. The only thing I can't do is ride at *very* high intensity.

As I recall, the better trained the individual, the more they convert fat to energy as opposed to carbs. People used to advise training at low intensities, i.e., not over 65% MHR before breakfast to train your body to utilize fat.

High intensity riding requires glucose which might be in short supply in the SB diet. I would hydrate well, as another lady suggested, and wear a heart monitor. Keeping your heart rate under 75% MHR might help. Teaching your body to operate in an endurance mode is essential for longer rides. I read that Lance Armstrong used to do 4+ months of endurance rides only. That means MHR of ~75% or lower.