Protein is essential for muscle repair, hormone production, and immune function, but it does not play a direct role in digestive regulation or gut health. While digestive enzymes break down protein into amino acids for absorption, protein itself doesn't promote bowel regularity or support gut bacteria in the way that fiber does. In fact, very high-protein diets — especially those low in fiber — can sometimes lead to digestive discomfort or constipation. While protein is crucial for many bodily functions, it’s fiber that supports digestive flow and gut microbial balance. For optimal digestion, a combination of adequate protein and fiber-rich foods is key, but fiber is the star player in this category.