Prunes are the single most effective fruit for constipation, but kiwifruit is a strong runner-up with clinical evidence that may surprise you. The best choice depends on what’s causing your sluggish digestion and how your body handles different sugars. Several fruits work through different mechanisms, so understanding why they help can guide you toward the right one.
Why Fruit Helps With Constipation
Fruits fight constipation through three main tools: soluble fiber, insoluble fiber, and a natural sugar alcohol called sorbitol. Soluble fiber dissolves in water inside your digestive tract, forming a gel that softens stool and makes it easier to pass. Insoluble fiber is the roughage your body can’t break down, so it moves through your system mostly intact, adding bulk that keeps things moving. Both types of fiber also feed the healthy bacteria in your gut and help coordinate the muscle contractions that push food along your intestines.
Sorbitol works differently. Your body can’t break it down during digestion, and when it reaches the colon, your body essentially wants to flush it out. That reaction draws water into the colon and can trigger a bowel movement. Fruits that combine high fiber with high sorbitol tend to be the most effective natural remedies for constipation. The recommended daily fiber intake for adults is 25 to 30 grams from food, and most people fall well short of that target.
Prunes: The Top Performer
Prunes (dried plums) have the highest sorbitol content of any common fruit at 11 grams per 100 grams. That’s nearly double the sorbitol in fresh plums and significantly more than any fresh fruit you’ll find at the grocery store. On top of that, prunes deliver a concentrated dose of fiber and contain a type of soluble fiber called pectin that adds bulk and softness to stool.
Prunes also contain plant compounds called polyphenols that have their own laxative effect. This triple combination of sorbitol, fiber, and polyphenols is why prunes consistently outperform other fruits in constipation studies. A typical serving of five or six prunes is enough for most people to notice a difference, often within 12 to 24 hours. Prune juice works too, though it contains less fiber than whole prunes. Harvard Health has highlighted that prune juice’s effectiveness comes from its high sorbitol, pectin, and polyphenol content working together.
The downside: prunes are calorie-dense compared to fresh fruit, and eating too many can cause cramping or diarrhea. Start with a small serving and adjust from there.
Kiwifruit: Backed by Strong Clinical Evidence
Green kiwifruit has emerged as one of the best-studied fruits for constipation relief. A large international clinical trial published in the American Journal of Gastroenterology found that eating two green kiwifruits daily increased complete bowel movements by roughly 1.5 additional movements per week in people with chronic constipation. Participants also experienced softer stools, less straining, and better quality of life.
What makes this finding notable is that kiwifruit performed better than psyllium (a common fiber supplement) for both stool consistency and straining. Kiwi contains a unique combination of soluble fiber, an enzyme that helps break down protein in the gut, and a high water content that together soften stool without the bloating that fiber supplements sometimes cause. Two medium kiwifruits provide about 4 grams of fiber, and participants in the trial also reported improvements in overall abdominal comfort.
If you find prunes too sweet or too intense, kiwifruit is a gentler option that still delivers measurable results.
Pears and Apples
Pears contain more sorbitol than apples, making them the better choice of the two for constipation. A medium pear with the skin on delivers about 6 grams of fiber, and the combination of sorbitol and fiber gives pears a mild natural laxative effect. Eating the skin is important because that’s where most of the insoluble fiber lives.
Apples are a decent option but work differently depending on how you eat them. Whole apples with the skin provide a good mix of soluble and insoluble fiber, plus some sorbitol. Apple juice, which has a high ratio of fructose to sorbitol, is often recommended for children with constipation. Applesauce, on the other hand, is high in pectin, which actually firms up stool. That makes applesauce better for diarrhea than constipation.
Berries Pack the Most Fiber
If your constipation is mainly a fiber problem, berries are hard to beat. Blackberries deliver 8 grams of fiber per cup, which is roughly a third of your daily recommended intake in a single serving. Raspberries are similarly high, coming in around 8 grams per cup as well. That’s more fiber per calorie than almost any other fruit.
Berries don’t contain much sorbitol, so they won’t have the same direct laxative kick as prunes or pears. Their strength is in adding consistent bulk and softness to your stool over time. Tossing a cup of blackberries or raspberries into your breakfast is one of the easiest ways to close the gap between how much fiber you eat and how much you need. Strawberries and blueberries have less fiber per cup but are still solid choices, and they tend to be well tolerated even by people with sensitive stomachs.
Stone Fruits and Citrus
Fresh plums, peaches, nectarines, and cherries all contain moderate amounts of sorbitol. Fresh plums have about 2 grams of sorbitol per 100 grams, cherries around 2 grams, and peaches and nectarines about 1 to 1.3 grams. None of these match prunes, but they’re helpful as part of a fruit-rich diet. Dried versions are more concentrated: dried peaches contain about 5 grams of sorbitol per 100 grams, and dried apricots about 6 grams.
Citrus fruits like oranges and grapefruits contribute in a different way. They contain a plant compound that has been shown in lab studies to increase muscle contractions throughout the digestive tract, from the stomach through the colon. This compound also appears to boost levels of hormones that stimulate gut movement. Oranges are also a good source of soluble fiber, especially in the white pith between the peel and the fruit. A large orange provides about 4 grams of fiber.
Fruits That May Cause Problems
Not every fruit agrees with every digestive system. Apples, pears, and watermelon are high in fructose, and people who don’t absorb fructose well can experience bloating, gas, stomach pain, or even diarrhea from eating too much of them. This is more common than most people realize. If fruit tends to make you gassy rather than regular, fructose malabsorption could be the reason.
People who are sensitive to fructose often tolerate lower-fructose fruits better. Grapes, blueberries, and strawberries tend to be easier on the stomach when eaten in small amounts with meals. Fruit juice of any kind concentrates the sugars without the fiber, so it’s more likely to cause digestive discomfort than whole fruit. If you have irritable bowel syndrome, be cautious with high-sorbitol fruits like prunes and pears, as sorbitol can trigger symptoms in sensitive individuals.
A Practical Approach
For fast relief, prunes are the most reliable option. Five or six per day, or a small glass of prune juice, is a reasonable starting point. For a gentler, everyday approach, two green kiwifruits daily have strong clinical backing. For long-term regularity, building your diet around high-fiber fruits like blackberries, raspberries, and pears will keep things moving consistently.
Combining fruits that work through different mechanisms is often more effective than relying on one. A breakfast with raspberries for fiber and a couple of kiwis for their stool-softening effect covers multiple bases. Whatever fruit you choose, increasing your water intake at the same time matters. Fiber absorbs water to do its job, and adding fiber without enough fluid can actually make constipation worse.