This thread is now mostly just a linkdump for whatever new relevant info I stumble upon, a fully fledged article on all this stuff available here:
I'm used to the disbelief and rage whenever I mention that fiber isn't essential, I get it, you grew up being accosted with the "fact" that fiber is good for you and it does all these magical things.
Frankly, they are nearly all completely wrong, and you've been led up the high-fibre garden path for too long, but nobody likes the idea that fiber might not be the mystical unicorn-grade asshole cleanser with god-like powers.
Seek out the evidence for yourself - I've done tons of research and have found NO EVIDENCE WHATSOEVER that fiber is something you should be consuming much of (if any), and almost certainly should NOT be supplementing.
Before you start a citation war with us few anti-fiber folk, please ensure it IS NOT epidemiological
- you know, the same shitty "studies" that tell us fat is bad and meat is cancer etc etc.
My go-to line about it all: "Fiber is great if you live on junk food"
TL;DR - Fiber is NOT good for you in and of itself, but in naturally occurring sources (eg, leafy greens and fruits etc) it's there to help, sort of. One thing is certain - it's nothing like the health food/supplement you've been lead to believe.