After a stomach virus, start with small sips of clear fluids for the first several hours, then gradually reintroduce bland, easy-to-digest foods as your symptoms improve. 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 its ability to handle certain foods, especially dairy.
Start With Fluids, Not Food
Your first priority is replacing the water and electrolytes you lost through vomiting and diarrhea. An oral rehydration solution (available at any pharmacy or grocery store) is the most effective option because it contains a balanced ratio of sodium and glucose that helps your intestines absorb fluid efficiently. Sports drinks, sodas, and fruit juices are poor substitutes. They contain too little sodium and too much sugar, and the excess sugar can actually pull more water into your intestines and make diarrhea worse.
If you can’t keep liquids down, start with a teaspoon at a time every few minutes and slowly increase the amount as your stomach settles. Clear broth and herbal tea (not caffeinated) are also good options during this phase. Aim for frequent small sips rather than gulping down a full glass, which is more likely to trigger nausea.
The BRAT Diet Is Fine, but Too Limited
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It’s a reasonable starting point for the first day or two, but there’s no research showing it works better than other bland foods. Harvard Health Publishing notes that a less restrictive approach makes more sense because the BRAT foods alone don’t provide enough protein or nutrients to support recovery.
Once you can tolerate those basics, expand to other gentle options:
- Starches: boiled potatoes, oatmeal, crackers, unsweetened dry cereal
- Vegetables: cooked carrots, butternut or pumpkin squash, sweet potatoes without skin
- Proteins: skinless chicken or turkey, fish, eggs
- Other: brothy soups, avocado
These foods are all bland and easy to digest, but they give your body the protein and micronutrients it needs to heal. Eggs are especially useful here because the protein in egg whites is easily absorbed and gentle on a recovering stomach.
Foods to Avoid for the First Few Days
Several categories of food can worsen diarrhea or nausea while your gut lining is still inflamed:
- High-fat foods: fried foods, pizza, fast food, and anything greasy
- Caffeine: coffee, caffeinated tea, energy drinks, and some sodas
- High-sugar foods and drinks: sweetened beverages, fruit juice, candy
- Dairy: milk, cheese, ice cream
- Alcohol and spicy foods
Why Dairy Can Be a Problem for Weeks
This one catches people off guard. A stomach virus can damage the lining of your small intestine, where the enzyme that breaks down lactose (the sugar in milk) is produced. Without enough of that enzyme, dairy products pass through undigested and cause bloating, gas, cramps, and diarrhea. According to the NIDDK, some people recovering from viral gastroenteritis have trouble digesting lactose for a month or more after the illness has passed.
This doesn’t mean you’ve become permanently lactose intolerant. The intestinal lining regenerates, and your ability to handle dairy will come back. In the meantime, you can test your tolerance by starting with small amounts of yogurt (which contains bacteria that help break down lactose) before moving on to milk or cheese.
Rebuilding Your Gut With Fermented Foods
A stomach virus disrupts the community of beneficial bacteria in your digestive tract. Fermented foods contain live bacteria that can help repopulate your gut as you recover. The key is variety, since different fermented foods provide different bacterial strains.
Good options once your stomach can handle them include yogurt or kefir (look for “live active cultures” on the label), miso soup, sauerkraut, and kombucha. Introduce these gradually. A small serving of plain yogurt or a cup of miso broth is a gentler starting point than, say, a bowl of kimchi, which may be too acidic or spicy for a sensitive stomach.
A Practical Timeline
Everyone recovers at a different pace, but here’s a general progression that works for most adults:
Hours 1 to 12: Focus entirely on fluids. Small, frequent sips of oral rehydration solution, clear broth, or herbal tea. Don’t force solid food if you’re still vomiting.
Hours 12 to 24: If you’re keeping fluids down, try small amounts of plain crackers, toast, or rice. Keep portions small. Eat slowly.
Days 1 to 3: Gradually expand to other bland foods like boiled potatoes, oatmeal, cooked vegetables, eggs, and lean chicken or fish. Continue drinking plenty of fluids.
Days 3 to 7: Transition back toward your normal diet. Reintroduce foods one category at a time so you can identify anything that still bothers you. Save dairy, fatty foods, and caffeine for last.
Feeding Children After a Stomach Virus
The approach for kids differs in a few important ways. Breastfed infants should continue nursing on demand throughout the illness, even during the worst of it. Breast milk provides both hydration and immune support. Formula-fed infants should go back to full-strength formula as soon as they’re rehydrated. Diluting formula (half-strength or quarter-strength) used to be common advice, but clinical trials have shown it prolongs symptoms and delays nutritional recovery.
Children eating solid foods should return to their normal diet as soon as they can tolerate it. There’s no need to restrict them to bland foods for days on end. For fluid replacement, a pediatric electrolyte solution is far better than juice or soda. If a child is vomiting, offer just 1 to 2 teaspoons of the solution at a time using a syringe or medicine dropper, and slowly increase the amount. Children under 22 pounds (10 kg) need about 2 to 4 ounces of electrolyte solution after each episode of vomiting or diarrhea; larger children need 4 to 8 ounces.
Lactose-free formula is usually unnecessary. Research shows no advantage over regular formula for most infants recovering from gastroenteritis.
Signs of Dehydration That Need Attention
Most stomach viruses resolve on their own within one to three days. The real danger is dehydration, especially in young children and older adults. Watch for dark urine or no urine output, a rapid heartbeat, rapid breathing, confusion, lightheadedness or fainting, and extreme thirst. These signs suggest dehydration has progressed beyond what you can manage at home with oral fluids.