We’ve seen the pendulum swing back and forth on the issue of fasted vs non-fasted rides on the podcast. I think it really depends on your goals and what you are trying to accomplish.
A few years back @chad did talk a lot about doing fasted rides and burning fat during them. However it sounds in hindsight he found these very difficult and may have even led to him feeling burnt out from riding for a period of time. It doesn’t mean they were not effective in burning fat, but it sounded like his overall energy and desire really took a hit.
@Nate_Pearson has been a strong proponent of fueling rides, including endurance rides. His rationale has been not only to perform better on the current ride, but perhaps even more importantly to improve recovery and be ready to take on more rides with good energy reserves. With him working hard to increase volume, this seems to have been a focus.
@Jonathan previously reported major GI issues with long rides and purposefully limited his intake because of this and it sounded like he often slogged his way through some of these rides. Somewhere along the line he started using Maurten and this seemed to be a turning point where he was able to absorb a whole lot more without the GI issues acting up. A couple podcast’s ago he made the point that he enjoys long rides so much more now with the nutrition onboard.
If someone is really wanting to lose weight and overall performance less critical, then fasted rides may make a lot of sense. However to truly become fat adapted my understanding is that you really have to work hard at it and just doing the occasional fasted ride, with the rest of the rides fueled, isn’t really going to help you become fat adapted.