After a stomach bug, your gut needs a gradual return to food, starting with clear liquids and working up to bland solids over roughly 24 hours. Most people are back to their normal diet within a week. The key is giving your digestive system time to heal, since the infection damages the lining of your small intestine, and those tissues need several days to fully recover.
The First 24 Hours: Liquids First
While you’re still vomiting, stick to ice chips or a popsicle. Nothing more. Once the vomiting stops and you can keep ice chips down, move to sipping clear liquids: water, apple juice, grape juice, or broth. These provide a few calories to keep you going until you’re ready for solid food. Take small, frequent sips rather than gulping a full glass, which can trigger nausea again.
Dehydration is the biggest risk during a stomach bug, especially if you’ve had both vomiting and diarrhea. Plain water replaces fluid but not the sodium and potassium you’ve lost. Oral rehydration solutions are designed to match what your body absorbs most efficiently. The WHO recommends formulations with a small amount of glucose alongside sodium, because the two are absorbed together through linked transporters in your gut, pulling water along with them. Products like Pedialyte or similar electrolyte drinks follow this principle. Sports drinks work in a pinch but tend to have more sugar than is ideal.
When to Start Eating Solid Food
After about 24 hours, or once you’re keeping liquids down comfortably, you can start with bland, easy-to-digest foods. The classic recommendation is the BRAT diet: bananas, rice, applesauce, and toast. These are gentle on your stomach and provide complex carbohydrates, which digest slowly and help restore energy without overwhelming your gut.
You don’t have to limit yourself to those four foods, though. Harvard Health notes there are no studies showing the BRAT diet is superior to other bland options. Crackers, plain oatmeal, plain grits, potatoes, and quinoa all work well. The goal is low-fiber complex carbohydrates that give your body fuel without requiring heavy digestive effort. These foods digest slowly into your bloodstream, letting your taxed system recover at its own pace.
A day or two of strictly bland eating is reasonable. After that, start adding more nutritious foods: cooked squash (butternut or pumpkin), cooked carrots, sweet potatoes without the skin, and avocado. These add vitamins and minerals your body needs to rebuild.
Adding Protein Back In
Once bland carbohydrates are sitting well, introduce lean protein. Skinless chicken, turkey, fish, and eggs are all good early choices. Keep preparation simple: baked, steamed, or poached rather than fried. Avoid heavy sauces, butter, or oil during the first few days. Your stomach is still rebuilding its digestive capacity, and fat slows gastric emptying, which can bring back nausea.
Small, frequent meals tend to be better tolerated than three large ones. Think of it as easing your digestive system back into its job rather than handing it a full workload on the first day back.
Foods to Avoid During Recovery
Several categories of food can worsen diarrhea or nausea while your gut is still healing:
- Dairy products. Your small intestine produces lactase, the enzyme that breaks down milk sugar. After a stomach bug, the cells that make lactase are often damaged. Some people have trouble digesting dairy for a month or more after the infection clears. If milk, cheese, or yogurt causes bloating or diarrhea, give it more time.
- High-fat foods. Fried foods, pizza, and fast food are hard to digest under normal circumstances. For a recovering gut, they’re a recipe for cramping and nausea.
- Caffeine. Coffee, tea, and caffeinated soft drinks can stimulate your intestines and worsen diarrhea.
- Sugary drinks and fruit juices. Large amounts of simple sugar draw water into the intestines, which can make diarrhea worse. Small sips of diluted juice are fine for hydration, but avoid drinking large quantities.
- Alcohol and spicy foods. Both irritate an already inflamed gut lining.
Why Your Gut Takes Time to Heal
A stomach bug doesn’t just cause symptoms while it’s active. The virus damages the tiny finger-like projections (villi) that line your small intestine and absorb nutrients. Research on rotavirus infections shows that villi shrink significantly within the first 18 to 48 hours of infection, losing blood flow and height. By about 72 hours after infection, they’ve regained their normal size, but the blood supply to those tissues doesn’t fully recover until around seven days post-infection, which lines up with when diarrhea finally resolves.
This is why you might feel mostly better after two or three days but still have occasional loose stools or find that certain foods don’t agree with you. Your intestinal lining is structurally repaired but still restoring full function. The temporary lactose intolerance many people experience is a direct result of this: the tips of those villi are where lactase-producing cells live, and they’re the last to fully regenerate.
Do Probiotics Help?
There’s reasonable evidence that certain probiotic strains can shorten diarrhea by one to one and a half days. The strain with the most clinical trial support is Lactobacillus rhamnosus GG (often sold as LGG), which has been tested in multiple randomized controlled trials and consistently reduces the duration of rotavirus-related diarrhea. Other strains with positive results include Saccharomyces boulardii (a beneficial yeast) and combinations of Lactobacillus and Bifidobacterium species.
Probiotics aren’t a cure, but if you’re already eating bland food and staying hydrated, adding a probiotic with one of these strains is a reasonable step. Look for products that list specific strain names on the label, not just generic “probiotic blend.” Yogurt can be a source once you’re tolerating dairy, but capsule-form probiotics avoid the lactose issue entirely.
Signs That Dehydration Is Getting Serious
Most stomach bugs resolve on their own, but dehydration can become dangerous if you can’t keep fluids down. Watch for dark-colored urine (it should be pale yellow), a rapid heart rate, unusual drowsiness or confusion, and dizziness when standing. Diarrhea lasting more than 24 hours, a fever above 102°F, or bloody or black stool all warrant medical attention. In children and older adults, dehydration escalates faster, so the threshold for concern should be lower.
A Practical Recovery Meal Plan
Here’s a realistic timeline for getting back to normal eating:
Day 1 (active symptoms): Ice chips, then clear liquids. Broth, diluted juice, electrolyte drinks. No solid food.
Days 2 to 3: Bland carbohydrates. Toast, white rice, bananas, applesauce, crackers, plain oatmeal, potatoes. Small portions, eaten frequently.
Days 3 to 5: Add lean proteins (chicken, eggs, fish) and cooked vegetables (carrots, squash, sweet potatoes). Keep portions moderate and preparation simple.
Days 5 to 7: Gradually reintroduce your normal diet. Try small amounts of dairy and see how you respond. Add fiber back slowly. If something causes cramping or diarrhea, back off and try again in a day or two.
Most people feel fully recovered and are eating normally within about a week. If your digestion still feels off after two weeks, or if dairy continues to cause problems after a month, that’s worth mentioning to your doctor, as post-infectious digestive changes occasionally linger.