I remember what you're talking about Limewave but my recollection of what it said was somewhat different...

I'm remembering it said that women can't carbo-load in advance the same as men, so we need to consume more carbs during a long effort.

Hopefully someone will find what it actually said.

But generally, I concur with the idea that it's dangerous to eliminate an entire macro-nutrient. Back in the 70s and early 80s it was "you don't need protein"... then in the late 80s and early 90s it was "you don't need fats"... and then Atkins and South Beach. All of it, without exception - even the macrobiotic craze of the 80s IMO - is marketing-driven.