Avoid foods to which you are sensitive. Consider allergy testing, if persistent. Evidence is accumulating that ingesting specific bacteria can help prevent a variety of diarrheal disorders, so probiotics are important. Decrease sorbital intake in sugar free gum, candies, etc. Fruit, fruit juice & other sugars can add to diarrhea. High magnesium & vitamin C intake can loosen stools. Rule out candida and other gastrointestinal or medical conditions, if persistent.