Summarize:

Large meals can force food through your digestive system and make you have to go to the bathroom more frequently. Rather than having 3 big meals every day, try to eat 45 times daily. Only have enough food so you feel satisfied but not overstuffed. You may lose your appetite when you get diarrhea. If you're also vomiting, wait about 12 hours before eating solid food. Foods that contain a lot of fat or spices can be irritating to your digestive system and trigger your diarrhea. Try to cut as many processed and fried foods from your diet as you can. Instead, opt for low-fat meals that are baked, grilled, or pan-seared to ensure they're healthy and won't upset your stomach. You may have a sensitive stomach from having diarrhea, so spicier foods may cause more irritation than normal. While you're still experiencing symptoms, try to have bread, pasta, and crackers made from white flour instead of wheat. Choose fruits and vegetables like applesauce, grapes, cantaloupe, green beans, peppers, and cauliflower since they contain less fiber than others. Aim to have only about 13 grams of fiber each day so you don't feel the urge to go as often. For example, 1 slice of white bread has about 0.8 grams of fiber and a cup (75 g) of green beans has less than 1.5 grams. While a fiber-rich diet is normally great for regulating your body normally, it can make your diarrhea more frequent. Avoid having fruit with the skin on, such as apple, berries, or pears, since they usually contain more fiber. Fructose is a natural sugar that forms in fruit, but it's also added to other foods as a sweetener. Check the list of ingredients on any foods you eat to make sure they don't contain fructose, sorbitol, or mannitol, since they may cause diarrhea or make your condition worse. Opt for regular sugar or other sweeteners if you need to. Common sources of fructose include honey, sodas, and corn syrup. Sorbitol and mannitol are typically found in sugar-free drinks and chewing gum. Bananas, rice, applesauce, and plain toast are great food options when you're not feeling well. They're easy on your stomach and contain necessary nutrients. Take small bites so you don't overwhelm your stomach. As you start feeling better, try incorporating more foods you'd normally eat into your diet. The BRAT diet helps firm up your stool so you're less likely to feel the urge to go to the bathroom. Opt for white bread and white rice since they contain less fiber and will help ease your stomach. You may get diarrhea after having milk products if you have lactose intolerance, so try to cut them out of your diet to see if your condition improves. Rather than having milk, look for non-dairy alternatives, such as soy, oat, or almond milk. Otherwise, you may also try using lactose-free varieties. If you need to have milk or dairy, look for non- or reduced-fat varieties since they'll be less irritating.
Eat smaller meals throughout the day. Avoid greasy or spicy foods since they may upset your stomach. Start a low-fiber diet so you're less likely to use the bathroom. Cut fructose and artificial sweeteners out of your diet. Try the BRAT diet if you have trouble digesting food regularly. Limit the number of dairy products you eat.