Plenty of everyday foods can get your bowels moving, and some work surprisingly fast. The most effective options fall into a few categories: high-fiber foods that add bulk, foods containing natural sugar alcohols that pull water into your gut, fermented foods that speed up transit, and stimulants like coffee that trigger contractions in your colon. Here’s what actually works and why.
Prunes: The Gold Standard
Prunes (dried plums) and prune juice are the most reliably effective food for making you poop, and they work through three mechanisms at once. They contain sorbitol, a sugar alcohol your body can’t fully absorb, which draws water into your intestines and softens stool. They’re also rich in pectin, a type of soluble fiber, and polyphenols, plant compounds that stimulate gut activity. A randomized placebo-controlled trial found that the combination of all three is what makes prune juice so effective at relieving constipation and normalizing stool consistency.
Five to six prunes (about 50 grams) or a small glass of prune juice is typically enough to produce results within a few hours to overnight.
Coffee Works in Minutes
Coffee can increase activity in the lower colon within four minutes of drinking it. It triggers the release of gastrin, a hormone that ramps up digestive contractions, and cholecystokinin, which causes your gallbladder to contract and speeds movement through the intestines. This effect isn’t purely about caffeine. Decaf coffee also stimulates the colon, though somewhat less intensely. Not everyone is sensitive to this effect, but roughly 30% of people find that coffee reliably sends them to the bathroom.
Kiwifruit
Green kiwifruit is one of the more underrated options. A placebo-controlled study found that kiwifruit supplements significantly increased the number of daily bowel movements in healthy adults, with some participants gaining more than one extra bowel movement per week. Two green kiwifruits per day is the amount most commonly studied. The fruit contains both soluble and insoluble fiber, plus a protein-digesting enzyme that may help break down food more efficiently in the small intestine.
High-Fiber Foods That Add Bulk
Insoluble fiber, the kind found in whole wheat, bran, vegetables, and the skins of fruits, works by physically bulking up your stool and stimulating the walls of your intestines to push things along. A large analysis of 65 studies found that every additional gram of wheat or cereal fiber per day added about 3.9 grams of stool weight. For people with slow digestion (transit times over 48 hours), each extra gram of cereal fiber also reduced transit time by about 45 minutes per day.
The most effective high-fiber foods for getting things moving include:
- Bran cereal or wheat bran: among the most concentrated sources of insoluble fiber, with some cereals delivering 10+ grams per serving
- Beans, lentils, and chickpeas: 7 to 8 grams of fiber per half cup, plus they feed gut bacteria that produce gas and stimulate contractions
- Broccoli, Brussels sprouts, and leafy greens: high in insoluble fiber and water content
- Pears and apples (with skin): contain both insoluble fiber and sorbitol
- Flaxseed and chia seeds: form a gel when they absorb water, which softens stool and adds bulk
If you’re not used to eating much fiber, increase your intake gradually over a week or two. A sudden jump can cause bloating, cramping, and gas before your gut adjusts.
Foods With Natural Sugar Alcohols
Sugar alcohols are carbohydrates your small intestine absorbs poorly. When they reach your colon, they draw water in through osmosis, softening stool and speeding things up. At high enough doses, they cause outright diarrhea.
The threshold varies by body weight. For xylitol, the dose that starts causing loose stools is roughly 0.37 grams per kilogram of body weight for men and 0.42 for women. That means a 70 kg (154 lb) man would hit the threshold at about 26 grams. Erythritol is more tolerable, requiring around 0.46 g/kg for men and 0.68 g/kg for women before it triggers diarrhea.
You’ll find naturally occurring sorbitol in prunes, apples, pears, peaches, and cherries. Sugar-free gums, candies, and protein bars are loaded with xylitol, erythritol, or maltitol, which is why “sugar-free gummy bear” reviews on the internet are famously dramatic. If you’ve ever eaten a whole bag of sugar-free candy and spent the next hour in the bathroom, this is why.
Fermented Foods
Yogurt, kefir, sauerkraut, kimchi, and other fermented foods contain live bacteria that can meaningfully change how fast food moves through your system. A meta-analysis of randomized controlled trials found that probiotics reduced overall gut transit time by nearly 14 hours on average and added about one extra bowel movement per week. The effect was strongest with products containing multiple bacterial strains rather than a single species, so kefir or a mixed-culture yogurt is a better bet than a supplement with just one strain.
Fermented foods won’t produce the immediate “I need to go right now” effect that coffee or prunes can, but regular consumption over a week or two tends to make bowel movements more frequent and softer.
Oils and Fats
A meal high in fat stimulates bile release, which naturally speeds up colonic contractions. Olive oil on an empty stomach is a traditional remedy in some cultures, and while it lacks strong clinical evidence, the fat content does lubricate stool and can help things slide along. Castor oil is a more aggressive option: it contains ricinoleic acid, which attaches directly to intestinal walls and triggers muscle contractions that force stool through. Castor oil is effective but can cause cramping and should be treated more like a medicine than a food.
The Fastest Options
If you need results soon, your best bets are coffee (which can work within minutes), prune juice (a few hours), or a high-sorbitol fruit like pears or cherries combined with a large glass of water. Hydration matters for all of these. Fiber and sugar alcohols both work by drawing water into your colon, so if you’re dehydrated, they’ll be less effective. A tall glass of warm water first thing in the morning, followed by coffee or a high-fiber breakfast, is one of the most reliable daily routines for keeping things regular.