After stomach flu and diarrhea, the best thing to eat is whatever you normally eat, as soon as your appetite returns. That advice surprises most people, but research shows that following a restricted diet does not help treat or recover from viral gastroenteritis. The real priorities are replacing lost fluids, easing back into eating when you feel ready, and temporarily avoiding a few specific foods that can make diarrhea worse.
Rehydration Comes First
Before worrying about food, focus on fluids. Vomiting and diarrhea drain water, sodium, and potassium from your body fast. Plain water alone isn’t ideal because it lacks the electrolytes your gut needs to actually absorb the fluid. The most effective approach is an oral rehydration solution, which uses a specific balance of salt, sugar, and water to pull fluid across the intestinal wall.
You can make one at home: combine 4 cups of water with half a teaspoon of table salt and 2 tablespoons of sugar. Sip it steadily rather than gulping it down, especially if nausea is still lingering. Store-bought electrolyte drinks work too, though many contain more sugar than necessary. Avoid fruit juice, soda, and sports drinks as your primary rehydration source, since the high sugar content can actually pull more water into the gut and worsen diarrhea.
Take small, frequent sips. If you can keep fluids down for a few hours without vomiting, you’re ready to think about food.
The BRAT Diet Is Outdated
For decades, doctors recommended the BRAT diet (bananas, rice, applesauce, toast) as the default recovery plan. That advice has changed. The American Academy of Pediatrics no longer recommends a strict BRAT diet for children with diarrhea because it’s too restrictive and lacks the calcium, protein, vitamin B12, and fiber a recovering body needs. For adults, eating only BRAT foods for a day at your sickest won’t hurt, but sticking with it longer than that can slow recovery by starving your gut of the nutrients it needs to repair itself.
Think of those foods as a starting point, not a meal plan. Bananas and rice are gentle and easy to tolerate, but they shouldn’t be the only things on your plate once your appetite picks up.
What to Eat as Your Appetite Returns
The NIDDK, the federal agency that oversees digestive disease research, puts it simply: when your appetite returns, go back to your normal diet, even if you still have some diarrhea. Your gut recovers faster when it has a full range of nutrients to work with.
That said, “normal diet” doesn’t mean diving into a heavy meal. Start with small portions and build up. Good early choices include:
- Plain starches: white rice, plain pasta, oatmeal, crackers, toast
- Lean proteins: baked chicken, scrambled eggs, plain fish
- Cooked vegetables: carrots, potatoes, squash (cooked is easier to digest than raw)
- Broth-based soups: chicken soup gives you fluid, salt, protein, and carbohydrates in one bowl
- Bananas: easy on the stomach and a natural source of potassium, which you’ve been losing
For children, the guidance is the same. Give them what they normally eat as soon as they’re willing. Infants should continue breast milk or formula throughout the illness, not just after.
Foods That Can Make Diarrhea Worse
While your gut is still irritated, certain foods are more likely to trigger another round of loose stools. These aren’t permanently off-limits, just worth avoiding for a few days.
Fatty and fried foods are the biggest culprits. When your damaged gut can’t absorb fat properly, undigested fat passes into the colon, where it’s broken down into fatty acids that cause the colon to secrete fluid. That means more diarrhea. Skip the pizza, fried chicken, and greasy takeout for a few days.
High-sugar foods and drinks are another trigger. Sugar stimulates the gut to release water and electrolytes, loosening stools. Fructose is especially problematic. It’s concentrated in fruit juices, sodas, applesauce, and fruits like pears, cherries, and apples. Artificial sweeteners like sorbitol, mannitol, and xylitol (common in sugar-free gum and candy) have the same effect. People who consume more than 40 to 80 grams of fructose per day are likely to develop diarrhea even when healthy, so a recovering gut is even more sensitive.
Caffeine speeds up digestion, which is the last thing you need when your gut is already moving things through too quickly. Coffee, energy drinks, chocolate, and caffeinated teas are all worth skipping until your stools return to normal.
Alcohol is dehydrating and irritating to an already inflamed gut lining. Give it at least a few days.
Dairy May Bother You Temporarily
Many people notice that milk, ice cream, and soft cheese cause bloating, gas, or diarrhea in the days after a stomach bug. This isn’t a coincidence. The virus damages the lining of your small intestine, including the cells that produce lactase, the enzyme that breaks down the sugar in dairy. Without enough lactase, dairy passes through undigested and ferments in the colon.
This temporary lactose intolerance typically resolves within three to four weeks as the intestinal lining regenerates. In the meantime, you can usually tolerate small amounts of dairy, hard cheeses (which are naturally low in lactose), and yogurt (where bacteria have already broken down some of the lactose). If dairy seems to set you off, simply avoid it for a few weeks and try again.
Ginger for Lingering Nausea
If nausea hangs around after the vomiting has stopped, ginger is one of the few home remedies with real clinical evidence behind it. Doses of 250 milligrams to 1 gram per day, split into three or four portions, have been shown to reduce nausea, with no added benefit from taking more than 1 gram. That translates to a few cups of real ginger tea (made from sliced fresh ginger, not ginger-flavored tea), ginger chews, or ginger capsules from a pharmacy.
What About Probiotics?
Probiotic supplements are heavily marketed for gut recovery, but the evidence is weaker than most people assume. A large Cochrane review, the gold standard for evaluating medical evidence, looked at whether common probiotic strains shortened diarrhea from infections. In the most rigorous studies (those with the lowest risk of bias), probiotics made little or no difference in whether diarrhea lasted beyond 48 hours. The reviewers concluded they were uncertain whether probiotics reduce the duration of diarrhea at all.
That doesn’t mean fermented foods like yogurt or kefir are worthless. They provide protein, calories, and some beneficial bacteria. Just don’t expect a supplement to dramatically speed up your recovery.
Signs You’re Not Recovering Normally
Most stomach flu resolves within one to three days. If diarrhea persists beyond a week, or if you notice signs of dehydration that aren’t improving with oral fluids, something more may be going on. In adults, warning signs include dark urine, dizziness when standing, a rapid heartbeat, and producing very little urine. In children, look for a lack of tears when crying, unusual drowsiness, dry mouth, and fewer wet diapers than normal. Severe dehydration can progress to cold or mottled skin, weak pulse, and confusion, all of which require urgent medical attention and intravenous fluids.
For most people, though, the recovery plan is straightforward: sip electrolyte fluids steadily, eat normal food as soon as it sounds appealing, skip the greasy and sugary stuff for a few days, and give dairy a trial run before committing. Your gut is remarkably good at repairing itself when you give it the raw materials to do so.