I recall an article in perhaps New Yorker Magazine many years ago where the author was explaining that Dim Sum (pot stickers) in China use recycled cardboard for the primary “meat” filling. I thought about that yesterday when I was label reading at the grocery store (yes I am one of “those people”).
The package of cookies or crackers I was looking at listed “microcrytaline cellulose” as an ingredient... you what that is? SAWDUST.
From a chemical perspective, cellulose is more or less cellulose.
So as far as its effects on the human body, I doubt it matters greatly whether the origin of the cellulose is wheat bran or sawdust.
It’s all “fiber,” which a few years ago was considered the best thing in the world for you.