After a ton of research, I think the generic suggestion 'Fiber' is not helpful.

Some things to consider:

>There are classifications of fiber, insoluable vs soluable

>Even those classifications are overly generalized, and can/should be broken down into basically individual foods.

>Fiber and the various types have impact on your gut bacteria. If your gut bacteria is bad, you might be fueling growth of bad bacteria.

>You don't actually need fiber

>You don't actually need a colon

>I think gut bacteria management will probably be the next big thing. A combination of more scientific probiotics + fiber/prebiotics.

>I'm guessing the colon cancer thing is probably due to pollutants. Not necessarily air, but could be from food.

"Fiber from food" seems good enough. It's hard not to fibermax without incidentally improving your diet substantially. For example, beans are one of the best and easiest sources of it.

Splitting hairs beyond that, like insoluble and soluble, is the kind of thing that just confuses and intimidates people about nutrition advice.

It's a bridge you can cross once everyone is eating 50g+ of fiber per day, has chiseled physiques, and are looking to min/max.

>I'm guessing the colon cancer thing is probably due to pollutants

> You don't actually need fiber

Hey, you know what fiber is good for? Speeding up gut motility! You know what a faster gut motility is good for! Getting toxins out of our body quicker!