Many common foods have a natural laxative effect, helping to soften stool, speed up digestion, or stimulate the bowel. Prunes are the most well-known, but dozens of fruits, vegetables, legumes, and other whole foods can get things moving. Whether you’re dealing with occasional constipation or just want to keep your digestion regular, building these foods into your diet is often enough to make a noticeable difference.
Prunes and Prune Juice
Prunes are the gold standard of natural laxatives, and for good reason. They contain sorbitol, a sugar alcohol that draws water into the intestines and softens stool. A single serving of about five prunes delivers roughly 3 grams of fiber along with a meaningful dose of sorbitol. Prune juice works too, though it has less fiber than whole prunes. Studies have found that eating around 100 grams of prunes daily (about 10 prunes) increases stool frequency and improves consistency more effectively than some over-the-counter fiber supplements.
High-Fiber Fruits
Fiber is the main mechanism behind most foods with laxative effects. It adds bulk to stool and helps it retain water, making it easier to pass. Several fruits are particularly effective:
- Kiwifruit: Eating two kiwifruits a day has been shown to increase bowel movement frequency and reduce straining. Kiwi contains both fiber and an enzyme called actinidin that may help stimulate movement in the gut.
- Apples and pears: Both are rich in a type of soluble fiber called pectin, which speeds up transit time through the colon. Eating them with the skin on maximizes the fiber content.
- Figs: Fresh or dried figs pack around 1.5 grams of fiber per fig. Dried figs, like prunes, also contain sorbitol.
- Berries: Raspberries deliver about 8 grams of fiber per cup, one of the highest amounts of any fruit. Blackberries are similarly fiber-dense.
- Citrus fruits: Oranges, grapefruits, and mandarins contain a fiber called pectin concentrated in the pith and membranes. Eating the whole fruit rather than drinking the juice is what gives the laxative benefit.
Vegetables That Keep Things Moving
Leafy greens like spinach, kale, and Swiss chard provide both insoluble fiber (which adds bulk) and magnesium, a mineral that draws water into the intestines. A cup of cooked spinach contains about 4 grams of fiber and roughly 39% of your daily magnesium needs.
Broccoli, Brussels sprouts, and artichokes are especially high in fiber. One medium artichoke contains about 7 grams. Sweet potatoes are another strong option, delivering around 4 grams of fiber per medium potato when eaten with the skin. The skin matters: peeling a sweet potato cuts its fiber content roughly in half.
Legumes, Beans, and Lentils
Beans and lentils are among the most fiber-dense foods available. A cup of cooked lentils provides about 15 grams of fiber, and a cup of black beans delivers around 15 grams as well. This combination of soluble and insoluble fiber is effective at increasing stool bulk and frequency. Legumes also contain resistant starch, a type of carbohydrate that isn’t digested in the small intestine. When resistant starch reaches the colon, gut bacteria ferment it, producing short-chain fatty acids that stimulate the muscles of the intestinal wall.
If beans tend to cause bloating or gas for you, start with smaller portions and increase gradually over a week or two. Your gut bacteria adjust to the increased fiber, and the gas typically decreases.
Whole Grains and Seeds
Oats, barley, and whole wheat bread all contribute meaningful fiber, but a few specific options stand out for their laxative properties. Wheat bran is one of the most effective. It’s almost entirely insoluble fiber, which means it passes through your system largely intact, adding bulk and speeding transit. Just two tablespoons of raw wheat bran contain about 3 grams of fiber.
Flaxseeds and chia seeds both form a gel when they absorb water, which softens stool and helps it move through the colon. Ground flaxseed is more effective than whole seeds because the outer shell is hard to digest. Two tablespoons of ground flaxseed provide about 4 grams of fiber. Chia seeds are even more absorbent, expanding to many times their size in liquid, which is why they’re often added to smoothies, yogurt, or water.
Foods Containing Natural Sorbitol
Sorbitol deserves its own mention because it works differently from fiber. While fiber adds bulk, sorbitol is osmotic, meaning it pulls water into the intestines. This makes stool softer and easier to pass. Beyond prunes, sorbitol is found naturally in cherries, peaches, apricots, and pears. Dried versions of these fruits concentrate the sorbitol, making them more potent per serving. A handful of dried apricots, for example, can have a noticeable effect within several hours.
Fermented Foods
Yogurt, kefir, sauerkraut, and kimchi contain live bacteria that can influence gut motility. Kefir in particular has been studied for constipation relief. In one trial, people who drank kefir daily for four weeks experienced increased stool frequency and improved stool consistency. The mechanism involves the live cultures altering the balance of bacteria in the colon, which affects how quickly food moves through.
Not all yogurt is equally helpful. Look for products that list live active cultures on the label. Heavily sweetened or heat-treated yogurts may contain few viable bacteria.
Coffee and Water
Coffee stimulates the colon within minutes of drinking it. Research shows that coffee increases contractions in the colon by about 60% compared to water and 23% compared to decaf. This effect is partly due to caffeine but not entirely, since decaf coffee also stimulates the bowel to a lesser degree. The acids in coffee trigger the release of hormones that speed up gut motility.
Water itself isn’t a laxative, but dehydration is one of the most common contributors to constipation. Fiber works by absorbing water, so increasing fiber intake without drinking enough fluid can actually make constipation worse. Most people need at least 8 cups of fluid daily for fiber to do its job effectively.
How Quickly These Foods Work
The timeline varies depending on the food and the person. Osmotic foods like prunes and dried apricots can produce results within 6 to 12 hours. Coffee typically stimulates the bowel within 20 to 30 minutes. High-fiber foods like beans, whole grains, and vegetables work more gradually, usually improving regularity over several days of consistent intake rather than producing an immediate effect.
If you’re adding a lot of fiber to your diet at once, expect some bloating and gas for the first few days. A smoother approach is to add one high-fiber food at a time and increase your water intake alongside it. Most people notice a clear improvement in regularity within a week of consistently eating more fiber-rich foods, especially when combining different types: a serving of fruit, a portion of legumes, and whole grains spread across the day covers both soluble and insoluble fiber and gives you the broadest laxative benefit.