Records of defecation status and probiotic foods
watery
The participants recorded their defecation status using the Bristol stool form scale (BSFS) for 1 week before fecal collection. BSFS is a tool designed to classify fecal form into seven categories (types 1–2 for hard feces, types 3–5 for normal feces, and types 6–7 for watery feces). This tool is widely used in clinical and research fields [