This may be due to the fact that some bacteria express the enzyme bile
salt hydrolase, which can affect intestinal cholesterol reabsorption (33, 34).
Bile
salt hydrolase - mediated inhibitory effect of Bacteroides ovatus on growth of Clostridium difficile — Soobin Yoon — Journal of Microbiology
This protein, bile
salt hydrolase, is commonly made by gut bacteria and functions to change the chemical properties of bile acids in the gut.