Cellulose is not "wood pulp" or "sawdust." Only about 50% of sawdust is cellulose. The rest is hemicellulose, lignin, resins, and oils. Any plant material that you eat contains cellulose. It's just about the most benign thing you could add to food as an anti-caking agent. ...not matter what the eater.com article with the attention grabbing headline that you linked to might say.