I came across this 2009 interview with former bodybuilder turned fitness coach Scott Abel recently and thought his comments re carb cycling interesting:
Often this industry seeks to create consumer dependence. The more complicated we make something, the more “genius” or “expert” guidance required to unravel it. It’s a way of creating two things.
One as I said, is dependence, and the other is the illusion of control. If we give people more and more variables to pay attention to, they “think” they are controlling complex bodily processes that are not linear one-way causative relationships. Again, by seeking to complicate what is simple, the industry creates for itself “experts” to unravel its own creation: complexity. …
The simple truth is that complicating things in the short run usually burns people out in the long run to the point they just give up and move on. The industry relies on this turnstile nature of consumers within it. So carb cycling may “work” depending on how you define it, but is it sustainable and relevant?
Seems to me you could replace “carb cycling” with a whole lot of other diet & exercise approaches. YMMV.