“Foods for the intestines” usually means one of two opposite problems. Either things are moving too slowly (constipation) or too fast (diarrhea), and the foods that help one can make the other worse. This guide covers ten of them — four for when things are too slow, six for when things are too fast — tells you which claims are backed by real trials versus tradition alone, and flags two foods — star fruit and persimmon — that carry risks worth knowing about before you reach for them.
Two different problems, one page
Food moves through your small intestine, where most nutrients get absorbed, then into the large intestine, where what’s left gets concentrated into stool. When that trip happens too fast, water and electrolytes leave the body before they can be reabsorbed — that’s diarrhea. When it happens too slowly, stool sits longer, hardens, and becomes harder to pass — that’s constipation. Same organ, opposite failure modes, and largely opposite fixes.
Foods for the intestines: fiber and fluid together
Before any specific food, two basics do most of the work. The NHS recommends adults aim for about 30g of fiber a day, most people fall short, and pairs that fiber target with adequate fluid — water helps fiber do its job by keeping stool soft enough to move [NHS, 2025]. Johns Hopkins Medicine puts the minimum closer to 25g a day and notes that fiber-fermenting gut bacteria produce compounds that support the cells lining the colon [Johns Hopkins Medicine, 2026]. The exact number matters less than the direction: most people dealing with constipation are simply under both targets.
When things move too slowly (constipation)
1. Prunes and plums — the best-tested option
Of everything on this page, dried plums have the strongest human evidence. A randomized crossover trial gave 40 adults with chronic constipation either 100g of dried plums a day (about ten to twelve prunes) or psyllium fiber, three weeks each. Prunes won: complete spontaneous bowel movements rose from 1.7 to 3.5 per week, compared with 1.7 to 2.8 on psyllium, and stool consistency improved more too [Attaluri et al., Alimentary Pharmacology & Therapeutics, 2011]. The mechanism is straightforward — prunes combine soluble fiber (pectin) with sorbitol, a natural sugar alcohol that draws water into the gut.
Fresh plums work the same way but more mildly, since drying concentrates both the fiber and the sorbitol. Because the effect is gradual rather than a stimulant laxative, prunes are often well tolerated by children and older adults, two groups more likely to have chronic constipation and less likely to tolerate harsher laxatives. Start with four to six a day rather than a whole bag — sorbitol in excess can cause gas or loose stools, especially in anyone with IBS.
For fruit-specific detail, see Plum Health Benefits.
2. Figs — close behind, with real trial data
Figs have their own randomized, placebo-controlled trial: 40 adults with functional constipation took fig paste for eight weeks and saw a significant drop in colon transit time along with better stool type and less abdominal discomfort than the placebo group, with no signs of organ toxicity on bloodwork [Baek et al., Asia Pacific Journal of Clinical Nutrition, 2016]. Dried figs work by the same combination as prunes — fiber plus a natural sugar alcohol — though with somewhat less sorbitol, which some people find gentler on the gut than prunes. Three to four dried figs a day is a reasonable starting point.
More on preparation and other uses: Health Benefits of Figs.
3. Corn and whole grains — fiber, not a cure
Corn, cornmeal, and popcorn are naturally gluten-free, which makes them genuinely useful for people with celiac disease or gluten sensitivity looking for a grain that won’t trigger symptoms. That part is well established. Traditional sources also describe corn as “soothing” to the intestinal lining and specifically helpful for dyspepsia, irritable bowel, or colitis — those claims trace back to a single reference text rather than independent clinical research, so treat them as traditional use rather than proven fact. What corn reliably offers is fiber: whole-kernel corn and cornmeal contribute to the daily fiber total that supports regular bowel movements, the same way any whole grain does.
Full nutritional breakdown: Health Benefits of Corn.
4. Star fruit — a mild laxative that can be dangerous for some people
Star fruit (carambola) contains soluble fiber that gives it a genuine mild laxative effect, and two to three at breakfast can help with occasional constipation. But star fruit also contains a neurotoxin called caramboxin along with oxalic acid, and in people with reduced kidney function, both are cleared from the body far more slowly than normal. That buildup has caused hiccups, confusion, seizures, coma, and death in people with chronic kidney disease or on dialysis — in documented cases, severe reactions occurred after eating only a handful of fruit, sometimes just one [Indian Journal of Nephrology, 2020].
This isn’t a minor footnote. If you have any degree of chronic kidney disease, are on dialysis, or aren’t sure about your kidney function, skip star fruit and star fruit juice entirely — there’s no dose that’s been shown to be reliably safe for that group. For everyone else with normal kidney function, star fruit in ordinary food amounts is not a known risk.
General nutrition profile: Carambola Star Fruit Health Benefits.
When things move too fast (diarrhea)
5. Rice — useful, but not the whole treatment
Plain rice is easy to digest and gluten-free, which is why it’s long been part of the food side of diarrhea recovery. But the old advice to rely on rice water as rehydration doesn’t hold up well: in significant diarrhea, especially in children, what actually prevents dehydration is a properly balanced oral rehydration solution (ORS) with the right ratio of sodium, potassium, and glucose — not homemade rice water, which doesn’t reliably deliver that balance.
The American Academy of Pediatrics, WHO, and the European pediatric GI society all recommend commercial ORS as first-line treatment for gastroenteritis, alongside returning to a normal diet quickly rather than restricting to bland starches for days [Medscape/eMedicine, Pediatric Gastroenteritis Treatment & Management, 2023]. Plain rice is a reasonable food to reintroduce once vomiting has settled — it just isn’t a substitute for rehydration.
Our rice page covers arsenic, glycemic index, and the rice-water-versus-ORS question in full: Rice Health Benefits.
6. Applesauce and apples — gentle, not magic
Apples contain pectin, a real soluble fiber that absorbs water and can have a mild firming effect on loose stool, along with tannins that have some astringent action. That’s a legitimate mechanism, and applesauce in particular — cooked, smooth, low in insoluble fiber — is a commonly recommended bland food during diarrhea recovery, especially for children. What doesn’t hold up is the idea of an apples-only diet as a cure for any diarrhea; that’s an overstatement of what pectin can do on its own, and it’s not a substitute for fluids and, when needed, ORS. One more detail worth knowing: apples are relatively high in fructose, which can worsen bloating and gas in people who are sensitive to it [Johns Hopkins Medicine, 2026].
More on apple’s other properties: Apple Health Benefits.
7. Persimmons — astringent, with a real caution
Persimmons combine pectin (soothing, water-absorbing) with tannins (astringent, drying) in a way that has a genuine traditional role in calming loose stools, particularly less-ripe fruit with a higher tannin content. The caution: those same tannins, eaten in quantity — especially from unripe fruit, on an empty stomach, or by someone with a history of stomach surgery, diabetes, or slowed gastric emptying — can clump together in the stomach and form a hard mass called a bezoar.
Case reports describe bezoars large enough to require surgical removal, in some cases in otherwise healthy older adults eating just one or two persimmons a day over time [PMC case report, 2025]. Occasional persimmon in ripe form is not a concern for most people; the risk rises with unripe fruit, large quantities, and the risk factors above.
Nutrition and other benefits: Health Benefits of Persimmon.
8. Pomegranate — promising, but still early
Pomegranate has the most active research pipeline of the three astringent fruits below. Its polyphenols show real anti-inflammatory effects on colitis in animal studies, and a small human proof-of-principle trial in people with inflammatory bowel disease in remission found that 12 weeks of pomegranate juice reduced a marker of gut inflammation in some patients [Minato et al., Molecular Nutrition & Food Research, 2025]. That’s promising, not proven — it’s early-stage human evidence built on a much larger body of animal research, not an established treatment for colitis or Crohn’s disease, and shouldn’t replace prescribed IBD therapy.
More: Pomegranate Health Benefits.
9. Sapote — a traditional astringent
Sapote is rich in tannins, which explains its long-standing reputation across Central America and the Caribbean as an intestinal astringent for diarrhea and gastroenteritis. That reputation is genuine as tradition, but it hasn’t been tested in human clinical trials for diarrhea specifically — treat it as a supporting food alongside hydration, not a treatment on its own.
More: Sapota Health Benefits.
10. Quince — pectin and tannins, with even less research
Quince follows the same basic pattern as persimmon: pectin that soothes and holds water, plus astringent tannins that dry the gut lining. It’s traditionally used as a first solid food after the acute phase of diarrhea, similar to applesauce. One practical note: raw quince is too harsh to eat plain, so it’s almost always cooked into jelly or paste — a process that also softens its tannin content, so its real-world astringent effect is milder than the raw-fruit chemistry suggests. Research specific to quince and diarrhea is limited to traditional-use reports rather than trials.
More: Quince Fruit Benefits.
Who needs to be more careful with these foods
- Chronic kidney disease or dialysis: avoid star fruit and star fruit juice entirely.
- History of gastric surgery, diabetes, or advanced age with slow digestion: go easy on persimmons, especially unripe ones, and don’t eat them daily in quantity.
- IBS or sorbitol sensitivity: prunes, figs, apples, and pears can all cause gas, bloating, or loose stools in larger amounts because of their natural sugar alcohols and fructose — increase slowly.
- Infants and young children with diarrhea: don’t rely on homemade rice water as rehydration; use a commercial oral rehydration solution and talk to a pediatrician about fluids and diet.
- Pregnancy and breastfeeding: ordinary food amounts of everything on this page are considered fine; as always, introduce new foods gradually and check with your doctor about any specific condition.
When to see a doctor
Food changes are for occasional, uncomplicated symptoms. Seek medical care for:
- Diarrhea with blood or black, tarry stool
- Fever above 102°F (39°C) alongside diarrhea
- Signs of dehydration — very little urination, dizziness, sunken eyes, extreme thirst
- Diarrhea lasting more than 2 days in an adult, or more than 24 hours in a young child or infant
- Constipation lasting more than a few weeks, or accompanied by unexplained weight loss, rectal bleeding, or severe abdominal pain
- Any new or severe abdominal pain
| Health Disclaimer: This article is for general education and isn’t medical advice. It doesn’t replace diagnosis or treatment from a qualified healthcare professional. Talk with your doctor or a registered dietitian before making significant dietary changes — especially if you’re pregnant, breastfeeding, managing kidney disease, diabetes, or IBS, feeding an infant, or taking medication that affects digestion. Information current as of publication date; nutrition research continues to evolve. |
Frequently Asked Questions
What’s the fastest food-based way to relieve constipation?
Dried plums have the strongest trial evidence of anything on this list — about ten to twelve a day improved bowel movement frequency more than psyllium fiber in a randomized trial [Attaluri et al., Alimentary Pharmacology & Therapeutics, 2011]. Figs are a close, slightly gentler alternative.
Is rice water safe for a child with diarrhea?
It’s not the recommended treatment. Commercial oral rehydration solution provides a tested balance of sodium, potassium, and glucose that homemade rice water doesn’t reliably match — use ORS and talk to a pediatrician, particularly for infants [Medscape/eMedicine, 2023].
Can I eat star fruit if I have kidney problems?
No. Star fruit contains a neurotoxin, caramboxin, that’s normally cleared by the kidneys; in people with chronic kidney disease or on dialysis, it can build up and cause serious neurological symptoms, even from a small amount [Indian Journal of Nephrology, 2020].
Are persimmons safe to eat every day?
Ripe persimmons in normal amounts are fine for most people. Daily large quantities, unripe fruit, or persimmons combined with a history of stomach surgery, diabetes, or slowed digestion raise the risk of a bezoar — a hard mass that can require surgical removal.
How much fiber do I actually need?
Guidance ranges from about 25g to 30g a day for adults, depending on the source [Johns Hopkins Medicine, 2026]; [NHS, 2025]. Most people eating a typical Western diet fall short of either number.
When should I stop trying food changes and see a doctor?
If diarrhea includes blood, fever, or lasts more than a couple of days in an adult (24 hours in a young child), or if constipation persists for weeks or comes with unexplained weight loss or bleeding, that’s a reason to get evaluated rather than keep adjusting your diet.
References
- Attaluri A, Donahoe R, Valestin J, Brown K, Rao SS. “Randomised clinical trial: dried plums (prunes) vs. psyllium for constipation.” Alimentary Pharmacology & Therapeutics, 2011. View source
- Baek HI, Ha KC, Kim HM, et al. “Randomized, double-blind, placebo-controlled trial of Ficus carica paste for the management of functional constipation.” Asia Pacific Journal of Clinical Nutrition, 2016. View source
- Johns Hopkins Medicine. “5 Foods to Improve Your Digestion.” View source
- NHS. “Good foods to help your digestion.” View source
- “Acute Kidney Injury with Neurological Features: Beware of the Star Fruit and its Caramboxin.” Indian Journal of Nephrology. View source
- “Diospyrobezoar (Persimmon Bezoar)-Induced Intestinal Obstruction in an Older Patient: A Case Report.” PMC. View source
- Minato et al. “Evidence for a Modulatory Effect of a 12-Week Pomegranate Juice Intervention…in Inflammatory Bowel Disease Patients.” Molecular Nutrition & Food Research, 2025. View source
- “Pediatric Gastroenteritis Treatment & Management.” Medscape/eMedicine. View source
