It´s so simple yet not at all easy.
Fair play to everyone trying.
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What does it say? Already from the framing I am suspecting it is guru click bait nonsense
I hope not 
In summary the podcast is with Dr Sam Impey who runs Hexis and supports some pro cycling teams / athletes.
They’re discussing a study linked below from Jeoffrey Rothschild where they have studied carbohydrate fuelling and where the mistakes are must often made for amatuer athletes. Fueling while on long sessions, bike rides etc is not really an issue. What people eat the rest of the time is.
It leans more on what is needed for peak performance but does discuss the realms of body composition and how over time the body adapts.
It’s basically the next step on from the idea of fueling workouts correctly.