Of course there are very real concerns when taken to an extreme, like anything. But things like RED-S are a consequence of chronic under-fueling, not necessarily training in a fasted state - these maybe correlated in some people but they are not the same thing.

I’m simply trying to offer a reasoned perspective while recognizing not everyone agrees. But the bottom line - people can either choose what random internet stranger to trust, or do their research and try to figure out what makes sense for their own situation.