I will tell you the secret: resistant fiber supplements.

There's other zero-calorie foods too, but they tend to cause intestinal discomfort rather than improve it.

Not that I think it's necessarily appropriate to discuss here, but I've also been of the opinion that fiber is pretty dang necessary for health. It limits calorie uptake, it massively helps shield against sugar uptake, it helps us poop better, etc.

Started having sweetened oatmeal for a midnight snack and already I feel better all over.