When you have diarrhea, certain foods and drinks can pull extra water into your intestines, speed up digestion, or irritate an already inflamed gut. Avoiding them can mean the difference between recovering in a day or two and dragging things out for much longer. Here’s what to skip and why it matters.
Dairy Products
Milk, ice cream, soft cheeses, and cream-based sauces are some of the worst offenders during a bout of diarrhea. Even if you normally digest dairy just fine, diarrhea can temporarily damage the lining of your small intestine, reducing its ability to break down lactose (the sugar in milk). When undigested lactose sits in your gut, bacteria ferment it, producing gas and drawing extra fluid into your intestines. The result: more bloating, cramping, and watery stool on top of what you’re already dealing with.
This temporary lactose intolerance usually resolves once your gut heals, but in the meantime, it’s best to avoid milk, cream, and soft dairy. Hard cheeses and yogurt are generally easier to tolerate because they contain less lactose, and yogurt with live cultures may actually help rather than hurt.
Greasy and Fried Foods
Fried chicken, french fries, creamy sauces, and fast food are hard on a healthy digestive system. During diarrhea, they’re even worse. When your body can’t absorb fat normally, it passes into the colon, where bacteria break it down into fatty acids. Those fatty acids trigger the colon to secrete fluid, which directly worsens diarrhea. Stick with lean proteins like plain chicken breast or baked fish until things settle down.
High-Fiber Vegetables and Roughage
Fiber is normally great for digestion, but insoluble fiber (the kind that adds bulk and doesn’t dissolve in water) can irritate an inflamed gut and speed food through your system even faster. The vegetables most likely to cause problems include broccoli, Brussels sprouts, cabbage, cauliflower, corn, peas, peppers, radishes, and spinach. Raw vegetables of any kind are also best avoided, since cooking breaks down some of the tough plant fibers that your gut is struggling to handle.
Beyond vegetables, skip anything with whole corn kernels (including popcorn and tortilla chips), seeds, nuts, coconut, and dried fruit. These are all high in insoluble fiber and physically rough on your digestive tract. Once your stool starts firming up, you can gradually reintroduce these foods.
Sugar Alcohols and Artificial Sweeteners
Sugar-free gum, diet candies, protein bars, and many “low-sugar” snacks contain sugar alcohols like sorbitol, mannitol, maltitol, and xylitol. These sweeteners are poorly absorbed in the small intestine, so they travel to the colon and draw water in behind them, creating what’s called osmotic diarrhea. In one study, a single 45-gram dose of maltitol caused diarrhea in 85% of participants. Sorbitol can trigger it at doses as low as 15 to 30 grams in young adults.
Check ingredient labels for anything ending in “-itol” and avoid it while you’re symptomatic. Sorbitol also occurs naturally in some fruits like prunes, pears, and apples (though applesauce in small amounts is usually fine). High-fructose corn syrup in large amounts can cause the same osmotic effect, so sugary sodas and fruit drinks with added sweeteners are worth skipping too.
Spicy Foods
Capsaicin, the compound that gives chili peppers their heat, activates pain receptors throughout your digestive tract. In a healthy gut, a moderate amount of spice is no big deal. But during diarrhea, when the intestinal lining is already irritated, capsaicin increases gut permeability and can trigger cramping, pain, and faster transit. Hot sauces, curries, salsa, and anything with significant chili content should wait until you’ve fully recovered.
Caffeine and Alcohol
Coffee, strong tea, energy drinks, and cola all contain caffeine, which stimulates contractions in your colon. That’s why many people need to use the bathroom shortly after their morning coffee. When you already have diarrhea, those extra contractions push food through even faster, reducing the time your intestines have to absorb water.
Alcohol is a double problem. It irritates the gut lining directly and acts as a diuretic, increasing fluid loss through urination at the same time you’re losing fluid through diarrhea. Both caffeine and alcohol can accelerate dehydration, which is the most dangerous complication of prolonged diarrhea.
What You Can Eat
You may have heard of the BRAT diet: bananas, rice, applesauce, and toast. These foods are easy on the stomach, but current medical guidance cautions against relying on them exclusively. A BRAT-only diet is low in protein, fat, and several essential nutrients, and prolonged restriction can actually delay recovery. Think of BRAT foods as a starting point, not a complete plan.
Once you can tolerate bland foods, expand to include plain chicken or turkey, eggs, white pasta, oatmeal, peeled potatoes, and well-cooked carrots. The goal is to eat enough to give your body the energy and nutrients it needs to heal, while keeping portions small and meals frequent rather than large.
Staying Hydrated Matters More Than Food
What you drink during diarrhea is at least as important as what you eat. Every loose stool pulls water and electrolytes out of your body, and dehydration can set in faster than most people expect. Signs to watch for include a dry mouth, dark urine, dizziness when standing, and a rapid pulse.
Water alone isn’t ideal because it doesn’t replace lost sodium and potassium. A simple oral rehydration solution following the World Health Organization’s formula calls for half a teaspoon (3 grams) of salt and 2 tablespoons (30 grams) of sugar dissolved in 1 liter of clean water. Store-bought options like Pedialyte work on the same principle. Sip steadily throughout the day rather than gulping large amounts at once.
Broth-based soups serve double duty: they replace fluid and sodium while providing some calories. Coconut water is another reasonable option for mild cases, since it naturally contains potassium and some sodium.
Probiotics Can Shorten Recovery
Certain probiotic strains can reduce the duration of acute diarrhea. A large meta-analysis of randomized trials in children found that Saccharomyces boulardii (a beneficial yeast sold over the counter) shortened diarrhea by about 1.25 days compared to placebo, making it the most effective single strain studied. Lactobacillus rhamnosus GG also performed well. While these studies focused on children, the same strains are widely used in adults. You can find them in supplement form or in some fermented foods. Starting a probiotic early in the illness appears to offer the most benefit.