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 "Psyllium husks tear up your intestines" where did you get this from? I bought that stuff and very occasionally add a spoon or two to a meal but thought it was actually quite good for your health? 
 Fibre's a psyop man.

Think about it.

They literally turned flour waste into a health food product. 

Why would putting indigestible substances into your digestive system be a good idea?

Before you say gut biome, I've got some probiotics to sell you. 
 I did try & find a credible source for the damage psyllium does but I can't find anything. Apparently psyllium is amazing.

I guess I made it up. 
 Sarcasm is such a waste of everybody's time ... 
 Your argument works great on micro plastics: if it doesn't decompose in hundreds of years, basically being inert, why would it harm to have some mg of it in my body?

For fiber though I think there is a case to be made that it increases the volume of what reaches your lower intestines and I think there is scientific evidence it lowers colesterol. Clearly it's not its chemical properties but its mechanical properties.