After the stomach flu passes, your body needs fluids first and food second. Start with small, frequent sips of water or an oral rehydration drink as soon as vomiting stops, then ease into bland, low-fat foods once you can keep liquids down. Most people can return to a normal diet within two to three days, but your gut may need up to a month to fully recover.
Start With Fluids, Not Food
Replacing lost water and electrolytes is the single most important thing you can do after a bout of stomach flu. Vomiting and diarrhea drain sodium, potassium, and water fast, and dehydration is the main reason people end up needing medical care.
Plain water works for mild cases, but if you’ve had significant fluid loss, an oral rehydration solution is more effective. These drinks use a 1:1 ratio of sodium to glucose, which takes advantage of a specific transport system in your intestinal lining to pull water into your body faster than water alone. You can buy premade solutions at any pharmacy, or make a basic version at home with water, salt, and a small amount of sugar. Sports drinks are less ideal because they contain more sugar and less sodium than your gut needs right now.
Take small sips every few minutes rather than gulping a full glass. If you drink too much too quickly on an irritated stomach, it may come right back up. Ice chips or frozen electrolyte pops can help if even sipping feels like too much.
Best Foods for the First Day or Two
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s a fine starting point, but there’s no medical reason to limit yourself to just those four foods. A broader range of bland, easy-to-digest options will give you more of the protein and nutrients your body needs to recover.
Good choices include:
- Brothy soups (chicken broth, miso, vegetable broth)
- Plain oatmeal
- Boiled or baked potatoes (without heavy toppings)
- Saltine crackers or plain dry cereal
- White rice or plain pasta
- Bananas and applesauce
Eat small portions. Your stomach has been through a lot, and large meals can trigger nausea or cramping even after the virus has cleared. Five or six small snacks spread through the day will sit better than three full meals.
Adding More Nutritious Foods
Once your stomach feels more settled, typically by day two or three, start working in foods with more protein and a wider range of nutrients. Sticking too long on just crackers and rice can actually slow your recovery by depriving your body of what it needs to rebuild.
Harvard Health recommends adding cooked squash (butternut or pumpkin), cooked carrots, sweet potatoes without skin, avocado, skinless chicken or turkey, fish, and eggs. These are all bland enough to be gentle on your gut but nutritious enough to support recovery. Yogurt is another good option because it’s generally well tolerated even when other dairy isn’t, and it contains live cultures that may help your digestive system get back on track.
Foods and Drinks to Avoid
Some foods that seem harmless can actually make diarrhea worse or irritate your healing gut. The main categories to steer clear of for the first several days:
- High-fat foods: Fried foods, pizza, fast food, and heavy sauces. Fat is the hardest macronutrient for your gut to process, and it can trigger cramping and loose stools when your digestive system is still inflamed.
- Sugary drinks and foods: Soda, fruit juice, candy, and gelatin desserts. Large amounts of simple sugar pull water into your intestines through osmosis, which worsens diarrhea rather than helping it.
- Dairy products: Milk, ice cream, soft cheeses. Stomach flu can temporarily damage the cells in your intestinal lining that produce lactase, the enzyme that breaks down milk sugar. This means you may be temporarily lactose intolerant even if you normally handle dairy fine. This effect can last a month or more after the infection clears.
- Caffeine and alcohol: Both are dehydrating, and caffeine can stimulate your gut to move faster than it should right now.
- High-fiber foods: Raw vegetables, whole grains, beans, and nuts. Fiber is normally great for digestion, but when your gut is recovering, it can cause gas, bloating, and cramping. Reintroduce these gradually over a week.
Ginger for Lingering Nausea
If nausea hangs around even after the worst is over, ginger is one of the few natural remedies with real evidence behind it. Ginger tea, ginger chews, or ginger supplements can help settle your stomach. Fresh ginger steeped in hot water is the simplest approach. Start with a small amount, since ginger on a completely empty stomach can occasionally cause irritation of its own.
Recovering Your Gut After Stomach Flu
The stomach flu doesn’t just pass through and leave everything unchanged. The virus damages cells lining your intestines, and your gut microbiome, the community of bacteria that helps you digest food, gets disrupted. This is why you may notice digestive sensitivity for days or even weeks after you feel otherwise healthy.
Probiotic-rich foods like yogurt, kefir, and fermented vegetables can help repopulate beneficial bacteria. Certain probiotic strains have been shown in clinical studies to shorten the duration of infectious diarrhea by about 24 hours. If you want to try a supplement, look for products containing well-studied strains rather than generic “probiotic blend” labels. That said, simply eating a varied, balanced diet as soon as you’re able is the most effective way to support your gut’s recovery.
Feeding Kids After Stomach Flu
The rules are slightly different for children. The CDC recommends against withholding food from kids for more than 24 hours during or after gastroenteritis, because early feeding actually shortens the illness and improves nutritional outcomes. Children who eat sooner recover faster.
Breastfed babies should continue nursing throughout the illness, even during the rehydration phase. Formula-fed infants should go back to their regular, full-strength formula as soon as rehydration is underway. Switching to a lactose-free formula is usually unnecessary. For older kids eating solid foods, the recommendation is to continue their normal age-appropriate diet, including complex carbohydrates, meats, yogurt, fruits, and vegetables. The main thing to limit is sugary drinks and snacks, which can make diarrhea worse.
Oral rehydration solutions designed for children are available at most pharmacies and are a better choice than juice, soda, or sports drinks. If your baby has no wet diapers for eight hours, is unusually sleepy, or has worsening vomiting or diarrhea, that warrants a call to their pediatrician.
Signs of Dehydration to Watch For
Most people recover from stomach flu at home without complications, but dehydration can become serious quickly, especially in young children and older adults. Warning signs include dark yellow urine or very little urine output, dry mouth and lips, dizziness when standing, and a rapid pulse. In severe cases, confusion, fainting, muscle twitching, or a fever above 103°F (39.4°C) signal that you need emergency care, as IV fluids may be necessary to rehydrate safely.