After the stomach flu, your priority is replacing lost fluids and easing back into eating with simple, gentle foods. Most people can start with small sips of water or an oral rehydration solution as soon as vomiting stops, then gradually reintroduce solid foods over the next 8 to 24 hours. The key is not to rush it, but also not to restrict yourself longer than necessary.
Start With Fluids, Then Add Food
While you’re still vomiting, solid food is off the table. Once you’ve gone about 8 hours without throwing up, you can begin adding simple solids back in small amounts. There’s no need to wait a full day. Your body needs nutrients to recover, and delaying food longer than necessary can actually slow that process down.
In the first hours after symptoms ease, focus on sipping fluids steadily. Oral rehydration solutions (sold at most pharmacies) contain water, sugar, and electrolytes in proportions your gut can absorb easily, even when it’s still irritated. Broth is another strong option: a single cup of chicken noodle soup is about 90% water and delivers roughly a third of your daily sodium needs, which helps replace what you lost through vomiting and diarrhea. Sports drinks work too, though they tend to be higher in sugar than you need right now.
The Best Foods for the First Day or Two
You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. It was the standard recommendation for decades, but medical groups including the American Academy of Pediatrics no longer endorse it. The reason is straightforward: those four foods are so nutritionally limited that sticking to them for more than about 24 hours can slow your recovery rather than help it. They’re fine as a starting point, but they shouldn’t be the whole plan.
Instead, eat as tolerated. That phrase comes up repeatedly in current guidelines, and it means exactly what it sounds like: try foods, see how your stomach responds, and expand from there. Good early choices include:
- Plain potatoes: Soft, low in fat, and easy to digest. One medium potato provides about 12% of your daily potassium, one of the electrolytes your body burned through fastest during illness.
- Bananas: Another reliable potassium source, plus they’re gentle on an irritated stomach.
- White rice or plain toast: Simple starches that are unlikely to trigger nausea.
- Broth-based soups: Combine hydration, sodium, and a small amount of protein in one bowl.
- Crackers: Easy to nibble in small amounts if you’re not ready for a full meal.
- Cooked vegetables and soft fruits: These provide vitamins A and C along with additional potassium, all of which support recovery.
Eat small portions rather than full meals at first. If something sits well, have a little more an hour later. Your appetite will guide you.
Foods to Avoid at First
While your gut lining is still healing, certain foods are more likely to cause cramping, bloating, or a return of diarrhea. Hold off on greasy or fried foods, which require more bile and digestive effort. Spicy dishes can irritate an already inflamed stomach lining. Caffeine and alcohol are both dehydrating, which is the last thing you need right now. High-fiber raw vegetables and legumes can also be tough to process in the first couple of days.
Dairy deserves its own mention. A stomach virus can temporarily damage the lining of your small intestine, which is where the enzyme that breaks down lactose (the sugar in milk) is produced. This means you may be temporarily lactose intolerant even if you normally handle dairy just fine. Symptoms like bloating, gas, and diarrhea after drinking milk are the giveaway. This effect typically resolves within three to four weeks as the intestinal lining regenerates. In the meantime, you can test small amounts and see how you feel, or simply avoid milk and ice cream for the first week or two and stick with lower-lactose options like aged cheese or yogurt.
Rebuilding Your Diet Over the Next Few Days
Most people feel dramatically better within 24 to 48 hours of their last bout of vomiting or diarrhea. As soon as you’re feeling well enough to eat more, you should. Your body needs protein, healthy fats, and a range of vitamins to repair the intestinal damage the virus caused. Plain chicken, eggs, oatmeal, and steamed vegetables are all reasonable next steps once the blandest foods are sitting well.
Reintroduce foods one at a time so you can identify anything that triggers a setback. If a particular food causes cramping or loose stools, set it aside for another day or two and try again. Most people are back to their normal diet within three to five days.
What About Probiotics?
Probiotics are widely marketed for gut recovery, but the evidence for stomach flu specifically is underwhelming. A large clinical trial at Washington University gave children with gastroenteritis a common probiotic (Lactobacillus rhamnosus GG, sold as Culturelle) twice daily for five days. It performed no better than a placebo. A similar Canadian study using a different probiotic strain found the same result. That doesn’t mean probiotics are harmful, and fermented foods like yogurt or kefir can be part of a healthy recovery diet. But buying a supplement specifically for stomach flu recovery isn’t well supported by current evidence.
Signs That Dehydration Needs Attention
The biggest risk from the stomach flu isn’t the virus itself but the fluid loss. Mild to moderate dehydration responds well to drinking more fluids at home. But severe dehydration requires medical treatment. Watch for these warning signs: diarrhea lasting more than 24 hours, inability to keep any fluids down, unusual confusion or irritability, extreme sleepiness, bloody or black stool, or a fever of 102°F or higher. In young children and older adults, dehydration can escalate quickly, so a lower threshold for seeking help is reasonable.