Cardboard provides insoluble fiber (and binding agents); How does one differentiate between cardboard ground in a smoothie and metamucil/glucomannan? Carboard

Cardboard provides insoluble fiber (and binding agents); How does one differentiate between cardboard ground in a smoothie and metamucil/glucomannan? Carboard's nutritional profile might even be better than many processed carbs (pasta, rice) when considering the fiber. Or that cellulose is a top ingredient to keep things like powdered parmesan cheese dry?