Flying Dodo
It'll soon be summer
The point being that it might be a load of old tosh.
Except it's not. A ketogenic diet was used over 100 years ago to effectively control epilepsy, and for athletes (cough) like us, there's lots of other scientific evidence.
The human body doesn't need carbohydrates at all. After all, go back a few thousand years, and there weren't any energy drinks or cake to keep people going.
I'm quite happy doing a fast, sweaty 50 mile ride, with no snacks or sugary drinks and not having to worry not bonking or feeling exhausted.