Simple, broth-based soups with mild starchy ingredients tend to be the best choices when you’re dealing with diarrhea. Rice soup, plain chicken or bone broth, and carrot-based soups show up most often in both clinical research and traditional dietary advice for good reason: they replace lost fluids and electrolytes, they’re gentle on an irritated gut, and in some cases the starches they contain can actually help reduce stool output. But not all soups are equal during a bout of diarrhea, and a few common ingredients can make things worse.
Rice Soup and Why Starch Matters
Rice soup, sometimes called rice water or congee depending on how thick you make it, is one of the most studied foods in the context of acute diarrhea. The idea is straightforward: cooking rice releases starch into the broth, and that starch provides a slow-release source of glucose that helps your intestines absorb water and sodium more efficiently. This is the same principle behind rice-based oral rehydration solutions, which have been used in pediatric medicine for decades.
A clinical trial comparing standard oral rehydration solution alone to the same solution paired with rice soup found that children who received both had significantly shorter episodes of diarrhea, averaging about 22 hours compared to roughly 35 hours in the rehydration-only group. Stool output was also lower during the first and second days of treatment in the rice soup group.1PubMed Central. The Effect of G-ORS Along With Rice Soup in the Treatment of Acute Diarrhea in Children: A Single-Blind Randomized Controlled Trial Another trial of preschool children with acute diarrhea found that a rice-based oral solution was highly effective at resolving dehydration and restoring electrolyte balance.2Journal of Pioneering Medical Sciences. Effectiveness of Rice-Based Oral Rehydration Solution in Correcting Dehydration and Electrolyte Imbalance Among Preschool Children with Acute Diarrhea
A separate comparison of glucose-based rehydration versus rice soup alone found both approaches reduced bowel movements at about the same rate over 48 hours, with no statistically significant difference between them.3Pakistan Journal of Medical and Health Sciences. Comparison of Glucose ORS with and without Rice Based ORS in Treatment of Acute Gastroenteritis from 6 Month to 5 Years In other words, rice soup on its own performed comparably to a standard medical rehydration formula. That’s a strong endorsement for something you can make in your kitchen with two ingredients.
You don’t need to follow a precise recipe. Cook white rice in extra water until it breaks down into a thin, starchy porridge. Season it lightly with salt. Avoid adding butter, cream, or heavy spices. The goal is bland, starchy, and salty enough to help your body hold onto fluid.
Bone Broth and Clear Broths
Clear broths, whether from chicken, beef, or vegetables, have been a go-to sick-day food across cultures for centuries. There’s a practical reason beyond tradition. When diarrhea is ongoing, your body loses water, sodium, and potassium at a rapid clip. A warm, salted broth replaces all three simultaneously. It’s also easy to sip even when your appetite has vanished, which matters because dehydration is the main danger of acute diarrhea rather than the diarrhea itself.
Bone broth in particular has attracted research attention for its amino acid and mineral content. A 2025 review found that the amino acids abundant in bone broth, including glutamine, glycine, and proline, along with minerals like zinc, calcium, and magnesium, can help support the intestinal lining. The review concluded that these components enhance gut barrier function, reduce intestinal inflammation, and improve nutrient absorption, with particular relevance for inflammatory bowel conditions.4PubMed. Bone Broth Benefits: How Its Nutrients Fortify Gut Barrier in Health and Disease That said, bone broth isn’t a treatment for diarrhea in the way a medication is. Its value during diarrhea is more about what it provides: hydration, easily absorbed nutrients, and compounds that support healing in an inflamed gut.
Store-bought broth works in a pinch, but check the label. You want something with adequate sodium (your body needs it for rehydration) but without a long list of additives, garlic powder, or onion powder that could aggravate symptoms. More on why those ingredients are worth avoiding below.
Carrot Soup and the Moro Soup Tradition
Carrot soup has an old pedigree as a diarrhea remedy, dating back to a formulation developed by an Austrian pediatrician named Ernst Moro in the early 1900s. The recipe is simple: boil carrots in salted water for an extended time, then blend and dilute. The idea is that prolonged cooking breaks down the carrots into acidic oligosaccharides, small sugar fragments that may interfere with how certain bacteria attach to the intestinal wall.
Most of the modern research on Moro soup has been conducted in animal models rather than large human trials. One study using a piglet model of post-weaning diarrhea found that supplementing with the carrot-based formulation led to a roughly two-thirds decrease in diarrhea incidence compared to controls. The duration of diarrhea shortened as well. On the microbial side, the researchers observed a substantial increase in beneficial Lactobacillus bacteria and a large drop in pathogenic E. coli. Markers of intestinal inflammation also improved.5Functional Foods in Health and Disease. A functional carrot-based food product in the prevention of post-weaning stress in piglets
Translating animal research directly to humans is always uncertain. Piglet intestines are similar enough to ours that they’re a common model, but a 67% reduction in diarrhea in piglets doesn’t guarantee the same effect in people. Still, carrot soup is cheap, gentle, nutritious, and unlikely to do harm, so it’s a reasonable addition to your recovery menu even if the evidence isn’t as strong as what exists for rice-based approaches.
What to Watch for With Sodium and Hydration
Soup’s biggest advantage during diarrhea is that it delivers fluid and electrolytes in a form your body can actually use. But not all soups do this equally well. An analysis of nearly 90 commercial “clear” fluids, including soups, juices, and beverages, found enormous variation: sodium content ranged from nearly zero to over 250 millimoles per liter, and osmolality spanned from 246 to over 2,000 milliosmoles per kilogram of water.6PubMed Central. Oral fluid therapy: sodium and potassium content and osmolality of some commercial “clear” soups, juices and beverages
Why does this matter? Fluids with very high osmolality can actually pull water into the intestines and make diarrhea worse. That’s why sugary juices and sodas are poor choices during a stomach illness. Soups land in a sweet spot when they have moderate sodium and aren’t loaded with sugar or heavy cream. A basic broth-based soup, sipped alongside plain water, tends to hit the right balance of fluid, sodium, and potassium without overwhelming an already stressed digestive system.
If you’re making soup at home, adding salt is genuinely helpful here rather than something to avoid. Your body is losing sodium with every loose stool, and replacing it helps your intestines absorb water. This isn’t the time to worry about a low-sodium diet unless your doctor has told you otherwise for a heart or kidney condition.
Soups That Can Make Diarrhea Worse
The ingredients that make soups flavorful in normal times can be the same ones that aggravate diarrhea. Cream-based soups are an obvious offender. Dairy can be difficult to digest even when you’re healthy, and during a diarrheal illness your intestinal lining may temporarily lose some of its ability to break down lactose. A bowl of cream of mushroom soup might taste comforting, but the fat and lactose can send you straight back to the bathroom.
Less obvious are the aromatic staples that form the base of most Western soups. Onion, garlic, and shallots are among the highest dietary sources of certain fermentable carbohydrates that draw water into the intestines and produce gas when they ferment in the colon.7Journal of Gastroenterology and Hepatology. Dietary practices and FODMAPs in South Asia: Applicability of the low FODMAP diet to patients with irritable bowel syndrome Legumes, wheat-based noodles, and coconut milk fall into the same category. A hearty minestrone loaded with beans, onion, and pasta might be one of the worst possible soups you could choose during an active episode.
Spicy soups are another category to sideline temporarily. Capsaicin accelerates gut motility in many people, and when your intestines are already moving contents through too quickly, that’s the last thing you need. If you’re craving something with more flavor than plain broth, a mild miso soup (made without onion or garlic) or a simple egg-drop soup can add variety without the problematic ingredients.
Here’s a practical shortlist of soup ingredients to avoid during diarrhea:
- Cream or butter: high fat slows digestion unevenly and dairy lactose ferments in an inflamed gut
- Onion and garlic: high in fermentable carbohydrates that draw water into the bowel
- Beans and lentils: gas-producing and hard to digest when the gut lining is compromised
- Spicy peppers: stimulate faster gut motility
- Wheat noodles: contain fermentable sugars and, for some people, are harder to tolerate than rice
The Role of Pectin and Soluble Fiber
You might have heard that fiber is bad for diarrhea. That’s only half true. Insoluble fiber, the rough stuff in raw vegetables and bran, can speed things along and make matters worse. But soluble fiber, which dissolves into a gel-like consistency, can actually help by absorbing excess water in the intestines and adding bulk to loose stools.
Pectin is a type of soluble fiber found naturally in cooked fruits and vegetables like carrots, apples, and squash. It’s part of why carrot soup has a traditional reputation for calming diarrhea. Research on pectin’s effects is mixed, though. A study in critically ill patients receiving tube feeding found that adding pectin fiber to their formula didn’t significantly reduce the severity of diarrhea compared to other groups, even though the incidence patterns differed between groups.8PubMed. Effects of pectin on diarrhea in critically ill tube-fed patients receiving antibiotics Critically ill patients on antibiotics are a very different population from someone with a stomach bug at home, so the results don’t transfer cleanly. But they’re a useful reminder that pectin isn’t a miracle fix.
In practical terms, soups made with well-cooked carrots, peeled potatoes, or butternut squash do provide soluble fiber in a form that’s gentle on an inflamed gut. You don’t need to seek out pectin supplements or overthink it. Just know that including soft, cooked vegetables in your broth is a better move than leaving them raw or choosing vegetables high in insoluble fiber like corn or cabbage.
How Much Does Diet Actually Matter During Diarrhea?
It’s worth being honest about the limits of the evidence here. A review of dietary management in diarrheal diseases noted that while patients commonly request guidance about what to eat, and while food-induced symptoms are genuinely common, there is surprisingly little strong evidence supporting the efficacy of most dietary recommendations for diarrhea.9Nutrition in Clinical Practice. Nutrition management of chronic diarrhea and malabsorption That doesn’t mean diet is irrelevant. It means that the traditional advice, eat bland, avoid irritants, stay hydrated, is based more on clinical experience and common sense than on large randomized trials specifically designed to test soup recipes against each other.
The strongest evidence supports the hydration side of things: replacing fluids and electrolytes matters far more than the specific food you eat. Rice-based approaches have the most clinical data behind them, particularly in pediatric acute diarrhea. Beyond that, the general principle of choosing easily digestible, low-fat, low-fiber foods is sound even if no single trial has proven that chicken broth beats vegetable broth or that carrot soup outperforms potato soup.
For most episodes of acute diarrhea caused by a virus or mild food poisoning, the illness resolves on its own within a few days regardless of what you eat. Your soup choices can make those days more comfortable and reduce the risk of dehydration, but they aren’t treating the underlying cause.
When Diarrhea Sticks Around
The advice above applies mostly to short-lived, self-resolving diarrhea. If your symptoms persist beyond a few days, or if you’re dealing with chronic diarrhea, the picture changes. Chronic diarrhea can have causes that no amount of soup will address, and some of those causes change which foods help and which make things worse.
One example is bile acid diarrhea, which can develop after gallbladder removal. After surgery, bile acids flow continuously into the small intestine rather than being stored and released in controlled amounts. When excess bile acids reach the colon, they stimulate the colon to secrete water and electrolytes, leading to persistent loose stools.10PubMed Central. Diagnosis and treatment of post-cholecystectomy diarrhoea For someone with bile acid diarrhea, fat content matters more than it does in a typical stomach bug: fatty soups trigger more bile release, which triggers more diarrhea. Low-fat broths and rice soups are still good choices, but the underlying condition often requires medication rather than dietary management alone.
Similarly, people with irritable bowel syndrome who experience frequent diarrhea may find that even “safe” soups trigger symptoms if they contain the fermentable carbohydrates mentioned earlier. For them, the choice of soup becomes less about what’s generally gentle and more about identifying personal triggers. Keeping a food diary alongside symptom tracking is far more useful than following generic advice about which soup to eat.
If diarrhea is accompanied by blood in the stool, high fever, severe abdominal pain, or signs of serious dehydration like dizziness or very dark urine, soup is not the answer. Those are signals to see a doctor rather than manage things at home. Soup is a support tool for mild to moderate episodes, not a substitute for medical evaluation when something more serious is going on.
A Simple Recovery Menu
If you want a practical plan rather than a list of principles, here’s what a reasonable day of eating looks like when diarrhea has you down. Start the morning with plain rice porridge or congee with a pinch of salt. Through the middle of the day, sip on warm chicken or bone broth between small, bland meals. If you want something more substantial by evening and your appetite is returning, a simple soup of well-cooked carrots or peeled potatoes in a clear, salted broth gives you soluble fiber along with fluid and electrolytes.
Between meals, drink water in small, frequent sips rather than large gulps. Large volumes of fluid at once can overshoot your stomach’s capacity and trigger nausea. If you have oral rehydration salts on hand, dissolving them in water is the most efficient way to replace electrolytes, but salty broth-based soups accomplish something similar for people who don’t have access to those packets or simply can’t stand the taste.
As your stools begin to firm up, you can gradually reintroduce more complex foods: lean proteins, soft-cooked vegetables, and eventually your normal diet. There’s no need to stay on a soup-only regimen longer than you feel like it. The old BRAT diet advice, bananas, rice, applesauce, and toast, has fallen out of favor with most gastroenterologists because it’s unnecessarily restrictive and can leave you short on calories and protein if followed for more than a day or two. Soup fits well alongside those foods as a bridge back to normal eating rather than a strict therapeutic protocol.