Why is a carnivorous lifestyle physiologically precluded for tapirs?

Answer

Their slow, fermentation-based digestive system cannot handle high protein/fat loads

Their anatomy functions as a hindgut fermenter optimized for slow breakdown of cellulose; a diet rich in meat would overload this slow, fermentation-based system, leading to digestive distress.

Why is a carnivorous lifestyle physiologically precluded for tapirs?
dietanimalmammalherbivoretapir