Originally Posted by
spelger
you get used to it.
In 2019, I rode the second half of a 400 km brevet on almost no calories because I managed to get my stomach upset. Not for lack of trying to eat, unfortunately. There was one point with 20 miles to go where I didn't think I could ride up another hill, but I did, albeit slowly. So all the fasted riding I did payed off, and that's why I did it in the first place. But the OP doesn't seem to be able to handle 30 minutes of probably not so fasted conditions. In general, however, I'm less worried about what harm he might do to himself and more about making the small amount of riding he is doing worthwhile.