After a stomach bug, the best approach is to start with clear fluids and small amounts of bland, low-fiber foods like white rice, toast, bananas, and broth, then gradually expand to more nutritious options over the next few days. Your gut lining takes a hit during gastroenteritis, and what you eat in the first 48 to 72 hours can either ease recovery or send you back to the bathroom.
Start With Fluids, Not Food
Replacing lost fluids is the single most important thing you can do after a stomach bug. Vomiting and diarrhea drain water and electrolytes fast, and plain water alone won’t fully restore what’s missing. A simple homemade rehydration drink, recommended by the University of Virginia School of Medicine, calls for 4 cups of water, half a teaspoon of table salt, and 2 tablespoons of sugar. The sugar helps your intestines absorb the salt and water more efficiently.
Sip slowly rather than gulping. If you’ve been vomiting, try a few tablespoons every 10 to 15 minutes and increase the amount as your stomach tolerates it. Popsicles made from juice or electrolyte solutions work well if even sipping feels difficult.
Sports drinks seem like an obvious choice, but most contain far more sugar than your body needs. High sugar concentrations can actually pull fluid out of your cells and increase urination, worsening dehydration rather than fixing it. If a sports drink is all you have, dilute it with an equal amount of water. Oral rehydration solutions sold at pharmacies are a better option because the sugar-to-salt ratio is designed for absorption, not taste.
What to Eat in the First 24 to 48 Hours
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s a fine starting point for the first day or two, but Harvard Health Publishing notes there’s no reason to limit yourself to just those four foods. A broader selection of bland, low-fiber options gives you more nutrients without irritating your gut. Good choices during this early phase include:
- White rice or plain pasta
- Saltine or graham crackers
- Brothy soups (chicken broth, vegetable broth)
- Oatmeal
- Boiled potatoes
- Bananas
- Plain toast or bread made with refined flour
- Unsweetened dry cereals with less than 2 grams of fiber per serving
The common thread is low fiber, minimal fat, and nothing spicy or acidic. Fiber is normally great for digestion, but your inflamed intestines aren’t ready for it yet. Refined carbohydrates like white rice and white bread are easier to break down and less likely to trigger cramping or loose stools. Eat small portions. A few bites every couple of hours is better than a full plate that overwhelms your stomach.
Adding Protein and Nutrients Back
Once you can keep bland carbs down comfortably, typically after a day or two, start reintroducing foods with more nutritional value. Your body needs protein and micronutrients to repair the gut lining and rebuild energy stores. Sticking with crackers and rice for too long leaves you short on both.
Good next-stage foods include skinless chicken or turkey, fish, eggs, avocado, cooked carrots, sweet potatoes without the skin, and cooked squash like butternut or pumpkin. These are all easy to digest while providing protein, potassium, and vitamins your body burned through during the illness. Keep preparation simple: baked, boiled, or steamed rather than fried or heavily seasoned.
What to Avoid for a Few Days
Some foods that are perfectly fine when you’re healthy can trigger setbacks during recovery. Fatty, greasy, or fried foods are the most common offenders because fat slows digestion and can worsen nausea. Spicy foods and anything highly acidic, like citrus juice or tomato sauce, can irritate an already sensitive stomach lining.
Dairy deserves special attention. A stomach bug can temporarily damage the cells in your intestines that produce lactase, the enzyme needed to digest milk sugar. This means you may develop a short-term lactose intolerance even if you normally handle dairy without problems. The Royal Children’s Hospital Melbourne notes this temporary intolerance can last a few weeks after gastroenteritis. Symptoms include bloating, gas, and a return of diarrhea after consuming milk, cheese, or ice cream. You can reintroduce dairy slowly once your digestion feels stable, starting with small amounts of yogurt or hard cheese, which contain less lactose than milk.
Caffeine and alcohol are also worth skipping. Both are diuretics that increase fluid loss, working against your rehydration efforts. Carbonated drinks can add to bloating and gas. Stick with water, herbal tea, and rehydration solutions until you feel consistently better.
Probiotics Probably Won’t Speed Things Up
It’s tempting to reach for probiotics to “restore” your gut bacteria after a stomach bug. But a large clinical trial involving nearly 1,000 children found that one of the most studied probiotic strains, Lactobacillus GG, made no difference in recovery. Children who took the probiotic twice daily for five days had symptoms and recovery timelines nearly identical to those who took a placebo. Diarrhea in both groups lasted about two days.
That doesn’t mean fermented foods like yogurt or kefir are harmful. They’re fine to eat once your stomach tolerates dairy again. But buying probiotic supplements specifically to recover from a stomach bug is unlikely to change how quickly you bounce back.
Signs That Dehydration Is Getting Serious
Most stomach bugs resolve on their own within one to three days. The real danger is dehydration, especially in young children and older adults. In adults, watch for dark-colored urine, urinating much less than normal, extreme thirst, dizziness, confusion, or skin that stays pinched up instead of flattening back immediately. In infants and toddlers, the warning signs include no wet diapers for three hours, no tears when crying, a dry mouth, sunken eyes, or unusual crankiness and low energy.
Diarrhea lasting more than 24 hours, an inability to keep any fluids down, bloody or black stool, or a fever of 102°F or higher all warrant a call to your doctor. These can signal something beyond a typical viral stomach bug or indicate dehydration severe enough to need medical treatment.