123: Performance gains and adaptations from fasted training, with Dr. Brian Carson  

Have you ever woken up early in the morning to go for a ride, skipped breakfast, and thought, “I wonder if that was bad for my training? Or maybe it was good?!” In today’s episode, we try to decipher if there are any advantages or disadvantages to occasionally riding, or exercising in general, in a fasted state. What does “fasted” actually mean, in this context? How’s that help, or hurt, my training? How conclusive is the evidence? And how often should I do it? Those are just some of the questions we’ll try to answer today.  

Fasting is one of those subjects that many of you have likely heard mentioned in passing, but whether or not it can lead to true performance gains is another matter. To fast or not to fast, that is the question. Today, we go particularly deep into the details of fasting, from the different types of fasting you can use for both health and performance benefits, to the genetic and cellular mechanisms which could play a role in adaptations.  

In essence, there are two overriding questions: Does fasting have health benefits? And does it help in training and performance? The science is pointing towards clear health benefits, but performance and training are less clear. We’ll explore all of that and much more today on Fast Talk. 

Our primary guest is someone who has spent his research career looking into these very questions. Dr. Brian Carson, of the University of Limerick, in Ireland, is a leading expert on the effects of exercising in a fasted state, as will become patently clear when we dive into the science.  

We’ll also hear today from longtime USA Cycling coach Jim Miller, pro roadie Petr Vakoc and pro mountain biker Payson McElveen, leading physiologist Dr. Iñigo San Millan, and neurologist Dr. Dale Bredesen. 

Put down that cookie. Let’s make you fast. 

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