Stomach rumbling is often misunderstood as a sign of digestive issues, but Dr. Saurabh Sethi, a gastroenterologist trained at Harvard and Stanford, emphasizes that it actually reflects a healthy digestive system. He explains that these sounds arise from the movement of food, gas, and fluids through the intestines, indicating that everything is functioning properly. Other signs of good health include passing gas, which shows an active gut microbiome, and clear or light yellow urine, suggesting proper hydration and kidney function. Sweating during exercise is crucial for regulating body temperature, while healthy gums should not bleed during brushing. Overall, many bodily functions that seem strange are simply indicators of a well-functioning body.