What are examples of this “dietary fiber”? Does that mean it only my comes from actual food, or can it come from supplements like psyllium?
Bran cereal, potatoes, prunes,...?
Oatmeal? Popcorn?
Products typically have fiber listed under the Carbohydrate section. You want grams of Soluble Fiber.
Keto or low carb breads normally have incredible amounts of soluble fiber.
Psyllium is an excellent fiber, but it doesn’t seem to produce SCFAs. It does lower cholesterol and keep you regular, though.
Inulin, FOS, modified or resistant wheat or corn starch / modified or resistant maltodextrin are all examples of soluble fiber that can help bacteria produce SCFAs.