Other causes can be more complicated, such as a food sensitivity or irritable bowel syndrome. If it lasts more than three days, it's time to see a gastroenterologist to see what could be the cause. For more temporary cases, focus on replenishing your system with probiotic-rich -- but otherwise bland and boring -- foods, like these:
Foods that require some sort of bacterial activity to make -- think yogurt, kimchi, miso, kombucha, and sauerkraut -- contain probiotics, which help calm down an overactive digestive system, Suchar says. In fact, recent research shows probiotics help shorten a bout of diarrhea by about one day. Anyone who's had a bad case knows that 24 hours may as well be a week.
Peas and carrots
While you want to be careful with raw veggies that can irritate your system, these two are rich in soluble fiber, which acts like a sponge in your intestines, Suchar says. "It helps sop up everything in the way to create a more formed bowel movement." More formed bowel movements are your goal, people. Keep things simple.