It can make you feel weak and become dehydrated. Replace the potassium lost to your body in diarrhea. If you do not have enough potassium you can feel very weak.
Some foods can actually help stop the diarrhea.
It would be good for you to eat plain white rice, cream of wheat or farina cereal, toasted white bread, plain macaroni or noodles, boiled eggs, oatmeal, ice cream, jello, applesauce, bananas, canned fruit, mashed potatoes, yogurt, and plain crackers. Don't skip meals, even though you don't feel like eating. Eat small amounts of food every couple of hours. Stay away from fatty, greasy foods and fried foods. Do not eat doughnuts, chips, fried potatoes or french fries, bacon, sausages, gravy, bologna, hot dogs, fried chicken, fried fish, or other fried meats.