When you have diarrhea, the best foods to reach for are bland, low-fiber, and easy to digest: white rice, bananas, plain toast, boiled potatoes, brothy soups, oatmeal, and crackers. These foods give your gut a break while you recover, and most bouts of acute diarrhea improve within 24 to 48 hours of eating this way. But what you eat is only part of the picture. What you avoid and how you stay hydrated matter just as much.
The BRAT Diet Still Works, but You Don’t Have to Stop There
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s been the go-to recommendation for decades, and it’s still a reasonable starting point for the first day or two of illness. These four foods are gentle on an irritated digestive tract and unlikely to make things worse.
That said, there’s no actual clinical evidence that restricting yourself to only those four foods produces better outcomes than a broader bland diet. Harvard Health notes that brothy soups, oatmeal, boiled potatoes, crackers, and unsweetened dry cereals are equally easy to digest and give your body more to work with nutritionally. The goal is to eat small meals throughout the day rather than three large ones, which puts less strain on your digestive system at any given time.
Foods That Help Firm Up Your Stool
Soluble fiber is your ally here. Unlike insoluble fiber (the rough, bulky kind in raw vegetables and whole grains), soluble fiber absorbs water in your gut and forms a gel-like consistency. This slows digestion and helps firm up loose stool. Good sources include bananas, oatmeal, applesauce, and white rice. Barley and smooth nut butters also contain soluble fiber and are generally well tolerated.
Avoid high-fiber foods like raw salads, whole grains, seeds, and beans during the acute phase. These can speed things through your intestines even faster.
Adding Protein Without Upsetting Your Stomach
Your body needs protein to recover, and you don’t have to wait until you’re fully better to eat it. Skinless chicken, turkey, fish, and eggs are all easy to digest when prepared simply: baked, boiled, or steamed with minimal seasoning. Smooth peanut butter on toast is another option that most people tolerate well.
Once your stomach starts settling (usually after the first 24 hours), you can expand to cooked carrots, sweet potatoes without skin, butternut or pumpkin squash, and avocado. These foods are still bland enough to avoid irritation but provide vitamins and minerals that help your body bounce back faster.
Hydration Matters More Than Food
Diarrhea pulls water and electrolytes out of your body with every loose stool. Dehydration is the main risk, especially if you’re also vomiting. Aim to drink a cup of water after every loose bowel movement, and sip fluids steadily throughout the day rather than gulping large amounts at once.
Plain water alone doesn’t replace the sodium and sugar your body loses. A simple homemade oral rehydration solution works well: combine 4 cups of water, half a teaspoon of table salt, and 2 tablespoons of sugar. The sugar isn’t just for taste. It helps your intestines absorb the water and sodium more efficiently. Commercial electrolyte drinks or oral rehydration packets from the pharmacy work the same way.
Broth-based soups pull double duty here, providing both fluid and sodium in a form that’s easy to keep down.
Foods and Drinks to Avoid
Some foods actively make diarrhea worse through specific mechanisms, not just because they’re “heavy” on the stomach.
- Caffeine speeds up the digestive system, pushing contents through your intestines faster. Skip coffee, energy drinks, and caffeinated teas until you’ve recovered.
- Dairy products contain lactose, a milk sugar that many people have difficulty digesting even under normal circumstances. When your gut is already inflamed, undigested lactose draws extra water into the intestines and loosens stool further. Yogurt with live cultures is sometimes an exception because the bacteria have already partially broken down the lactose.
- Fatty and greasy foods cause problems when fat isn’t absorbed properly in the upper digestive tract. The undigested fat reaches the colon, where it gets broken down into fatty acids that trigger the colon to secrete fluid, directly worsening diarrhea.
- Alcohol irritates the gut lining and acts as a diuretic, compounding dehydration.
- Sugar-free candies and gums often contain sugar alcohols like sorbitol and mannitol, which are poorly absorbed and pull water into the intestines.
- Spicy foods can irritate an already sensitive digestive tract and increase cramping.
Whether Probiotics Help
Probiotics have some evidence behind them for acute infectious diarrhea. A large Cochrane review found that probiotics reduced the average duration of diarrhea by about 30 hours and lowered the chance of diarrhea lasting beyond three days by roughly a third. The strains most commonly studied include Lactobacillus rhamnosus GG and Saccharomyces boulardii, both widely available in supplement form and in some yogurts.
The caveat: researchers haven’t pinpointed a single best strain or dose for adults specifically. The evidence is promising but not definitive enough for firm treatment guidelines. If you want to try probiotics, they’re generally safe for otherwise healthy adults and unlikely to make things worse.
When and How to Return to Normal Eating
Most people can stop the bland diet and start reintroducing regular foods after 24 to 48 hours of improvement. This doesn’t mean jumping straight to a burger and fries. Transition gradually: add cooked vegetables first, then lean meats with light seasoning, then slowly bring back whole grains, raw fruits, and eventually dairy and fattier foods over the following two to three days.
If you reintroduce something and your symptoms flare up again, back off and try again the next day. Your gut lining may still be healing even after the diarrhea itself has stopped. Eating smaller, more frequent meals during this transition period puts less demand on your digestive system than returning to full-sized meals right away.