So many folks that have it say things like "I was super healthy! Did exercise, young, don't drink, etc." Then you dig deeper and realize the last vegetable meal they ate was a soggy brussel sprout their mom made them when they were 17 years old, and also eat cold cut turkey sandwiches every lunch because they're "healthy", and maybe have a tiny shred of lettuce in the sandwich. For breakfast, they eat pancakes or sug…
Are you serious? Do you really think thats the reason that this is happening -- that people don't just eat their veggies? Fiber is important but, um, that's a pretty hot take. I suspect there are other factors at play.
That certainly does not help the situation. Whether it's correlational or causal I'd leave up to people more knowledgeable in the subject.