shows that if our gut bacteria are ‘primed’ with natural polysaccharides – long chains of sugars found in fruits, vegetables and cereals – the cellulose derivatives can be digested. This is because the natural polysaccharides activate enzymes that are produced on bacteria cell surfaces that can also break down artificial cellulose molecules.

So if you don't eat fruit, veggies, or grains then this cellulose just passed through?