Diet in Diarrhea: Banana, Apple, Pomegranate vs. Sweet Corn

Foods generally helpful (banana, apple, pomegranate)

• Rich in pectin (soluble fiber) and potassium — pectin absorbs excess water in the gut lumen and firms stool, while potassium replaces losses from watery stool.
• A study in Bangladeshi children with persistent diarrhea found that adding green banana or pectin to a rice-based diet produced a "significant reduction" in diarrhea duration and stool output - Yamada's Textbook of Gastroenterology, p. 1462-69.
• Important caveat: the old "BRAT diet" (banana, rice, applesauce, toast) is now considered unnecessarily restrictive and calorie/nutrient-poor, so major emergency medicine guidance no longer recommends it as a standalone regimen - Tintinalli's Emergency Medicine, p. 890. Current guidance favors resuming a normal, age-appropriate diet as soon as fluid deficits are corrected, rather than restricting to bland/binding foods alone.

• Also a good source of pectin, which gels in the gut and adds bulk/binding to loose stool. This is the physiologic rationale behind including applesauce in traditional bland diets for diarrhea.
• Raw apple with skin adds more insoluble fiber and can be less well tolerated than cooked/peeled apple during active diarrhea.

• Traditionally used for diarrhea because of its high tannin (astringent) content, which has a mild antisecretory/antimicrobial effect on the gut mucosa. This is more a traditional/nutraceutical use than a strong evidence-based textbook recommendation in the sources searched, but it fits the same "astringent, low-irritant fruit" category as banana and apple.

Sweet corn — generally not recommended during active diarrhea

• Increase stool bulk and mechanically stimulate the bowel, worsening frequency
• Pass through largely undigested, adding no binding benefit (unlike pectin from banana/apple)

Bottom line

• Banana, apple (cooked), pomegranate: pectin/tannin-rich, help firm stool and replace electrolytes - reasonable to include in a diarrhea diet.
• Sweet corn: high insoluble fiber, poorly digested, best avoided or limited during the acute phase.
• Current pediatric/emergency medicine guidance emphasizes not over-restricting the diet overall — the priority is oral rehydration plus early return to a normal, nutritionally adequate diet, using foods like banana/apple/pectin as helpful adjuncts rather than the entire diet.

Sweet Curd (Yogurt) in Diarrhea

Why it helps

• Yogurt contains Lactobacillus and related live bacteria that colonize the gut and compete with pathogenic organisms, helping restore normal gut flora - Sherris & Ryan's Medical Microbiology, p. 366.
• Meta-analyses show a moderate clinical benefit of certain probiotic strains (including those found in yogurt) in reducing the duration and volume of diarrhea in hospitalized patients - Tintinalli's Emergency Medicine, p. 890-93. The effect size varies because bacterial content/strain across commercial yogurts is inconsistent.
• In malnourished adults with lactose intolerance, plain milk can trigger or worsen diarrhea, but yogurt is often tolerated and used as a substitute for milk - the fermentation process reduces lactose content, since bacterial action breaks it down - Sleisenger and Fordtran's Gastrointestinal and Liver Disease, p. 2775-83; Biochemistry, Lippincott Illustrated Reviews, p. 3380-98.
• More broadly, probiotics/fermented foods like yogurt are highlighted as a source of beneficial live microorganisms for gut health - Goldman-Cecil Medicine, p. 3576-80, and specific probiotic use has shown benefit in reducing stool output in infants with rotavirus-associated diarrhea - Goldman-Cecil Medicine, p. 690-92.

Important nuance: "sweet" curd specifically

• The benefit comes from the live bacterial culture, not the sugar. Adding sugar ("sweet" curd/dahi, a common South Asian preparation) doesn't add therapeutic value and in large amounts can theoretically worsen osmotic diarrhea (extra sugar draws more water into the gut lumen), though plain culturally-sweetened curd in normal food amounts is not a clinical concern.
• Plain, unsweetened curd/yogurt with live active cultures is the more rational choice if the specific goal is probiotic benefit — it avoids adding fermentable sugar load while still delivering the beneficial bacteria.
• Avoid yogurt if there's a milk protein allergy; it's a reasonable option even in mild lactose intolerance since fermentation lowers lactose content, but people with more severe lactose intolerance may still have some intolerance to it.

Putting it together with your fruit question