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quoting nevent1q…2wkn

"While our earliest ancestors were more or less herbivores by nature, as indicated by their anatomy and physiology, Homo later evolved into an omnivorous species.

In herbivores the enzymatic digestion begins through saliva in the mouth. Carnivores, on the other hand, gulp down their food, which is digested only in the stomach.

In addition, fermentation chambers exist in the large intestine of both herbivores and omnivores, where the indigestible food components are broken down.

The intestine of a typical carnivore also differs from that of an herbivore with regard to its length. Carnivores have a very short intestine, herbivores have a very long one, while omnivores are somewhere in between.

The intestinal length in humans can be explained in terms of evolutionary history over the course of hominisation and is generally associated with an increase in meat consumption." - Nutrition and Health in Human, Evolution–Past to Present, PubMed
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9460423/