At a Glance
The foods that relieve constipation work through a few different mechanisms, including adding bulk to stool, holding water in the colon, and gently supporting movement through the gut. Adding them gradually and drinking enough fluid matters just as much as which ones you choose. This is not a “eat more bran and hope for the best” situation. There is a right order, and the wrong starting point can make constipation and bloating worse before it gets better.
If you have ever done everything right and still felt stuck, you are not imagining it. You added fiber, you drank water, you waited. And nothing happened, or things got worse. It is very common for someone to reach for a high-fiber supplement, spend a week more bloated than before, and conclude that fiber just does not work for them. That is not what is happening. The fiber is not the problem. The starting point is.
This post covers the 10 foods that relieve constipation with the most research behind them. The series also covers types of dietary fiber, soluble vs insoluble fiber, 10 best fiber-rich foods for digestion, 7 signs you are not eating enough fiber, and more.
Why not all constipation remedies work the same way
Here is something that surprises a lot of people. Constipation is not always a fiber deficiency. Some people are eating plenty of fiber and still struggling. The reason is that fiber needs water to do its job. Without enough fluid alongside it, fiber can actually make stool harder and more difficult to pass. Think of adding dry concrete mix to a pipe without water. It does not flow. It sets.
There are also two types of fiber, and they behave very differently in your gut. Insoluble fiber adds bulk and speeds things up. Soluble fiber absorbs water and forms a soft gel, which softens the stool and makes it easier to pass without cramping. Most people with constipation do better starting with soluble fiber. And a few foods on this list work through a different mechanism entirely. They contain compounds that draw water directly into the colon, which is why prunes can work even when fiber intake is already solid.
10 foods that relieve constipation naturally
1. Kiwi
Two kiwis a day. That is one of the most well-researched things you can do for constipation, and most people are genuinely surprised by it. Multiple studies, including a large international trial, found that eating two green kiwis daily makes a real difference in how often you go and how comfortable it feels. They work because of a combination of fiber, water, and a digestive enzyme that helps things move along. And unlike a lot of high-fiber options, they tend to sit well even for people who are sensitive to other foods on this list.
2. Prunes
Prunes for constipation are not just old wisdom. The research behind them is genuinely solid. Studies show that eating prunes daily increases how often you go and makes stools easier to pass. They work through two things: fiber, and a naturally occurring compound called sorbitol that draws water into the colon and keeps things soft. That is why prunes can work even when fiber intake is already decent. Five to six is a good starting amount. Too many and things may go further in the other direction than you wanted.
3. Pears
Pears are a quieter version of prunes. They contain a mix of both types of fiber plus a small amount of that same softening compound, sorbitol. Most people find them easier to eat daily than prunes, and they are gentle enough for those who tend to be sensitive. A medium pear with the skin on has around five grams of fiber and a high water content, both of which help keep things moving.
4. Chia seeds
Drop a tablespoon of chia seeds into water and watch what happens. They swell up and form a thick gel. That is exactly what they do in your gut, and it is what makes them useful for constipation. They add bulk and hold water in the stool at the same time. The important thing is that they need enough liquid to do that job. Dry chia seeds without enough fluid can actually slow things down instead. Start with one teaspoon and build up gradually. Stirring them into oats or a smoothie and letting them sit for a few minutes before eating is the easiest approach.
5. Ground flaxseed
Flaxseed for constipation has been tested head-to-head against a placebo in a proper trial, and it came out ahead. The key word is ground. Whole flaxseeds pass through your digestive system largely intact, which means you get very little benefit from them. Ground flaxseed, on the other hand, releases its fiber and gets to work. One tablespoon stirred into oats or yogurt each day is a simple starting point. Like chia, it needs water alongside it to be effective.
6. Oats
If you have ever had a bad experience adding fiber to your diet, oats are the place to start over. The fiber in oats forms a soft gel as it moves through your gut, which gently softens stool without the hard push that causes cramping and urgency. Research supports oats for improving how regularly things move and how easy they are to pass. They are about as low-drama as high-fiber foods get.
7. Lentils
Lentils are a solid source of both types of fiber and tend to be well tolerated when you ease into them. The trick with lentils is not to go from zero to a full serving overnight. Start with a quarter cup of rinsed canned lentils added to a soup or salad. Canned and rinsed tends to be gentler than cooking them from dried. Give your gut a couple of weeks to adjust before increasing.
8. Beans
Beans work similarly to lentils for supporting regularity, but they ferment faster in the gut, which means gas is more likely if you add too much too soon. A few tablespoons of rinsed canned beans added to meals a few times a week is a more forgiving way to start than jumping straight to a full serving. Increase slowly and your gut will adjust.
9. Leafy greens
Spinach, chard, and romaine are not going to move the needle on their own, but they contribute something useful: both fiber and water in one food. A large portion of cooked spinach gives you around four grams of fiber plus a significant amount of fluid, which supports the overall pattern without adding any meaningful risk of gas or discomfort. Think of them as something that quietly adds to the effort rather than the star of the show.
10. Yogurt or kefir
The honest answer here is that the evidence is more mixed than for the whole foods above. Some research suggests that fermented dairy products may support regularity for some people, particularly those with gut bacteria that respond well to probiotics. Studies on probiotic supplements show clearer results than studies on fermented foods alone. So yogurt is not the most powerful option on this list, but if you tolerate dairy, a small amount of plain yogurt with live cultures is low-effort and may help as part of a broader constipation diet plan.
How to add foods that relieve constipation without making bloating worse
This is the part most people skip over, and it is where things tend to go wrong. If your fiber intake has been low and you suddenly add five high-fiber foods in one day, you are almost certainly going to feel worse, with more constipation and more bloating, not because those foods are wrong for you, but because your gut bacteria need time to catch up.
Add one food at a time. Start smaller than you think you need to. Give it a few days before you add anything else. And drink more water as you increase fiber, because what to drink for constipation matters as much as what to eat, and most people underestimate this completely. Water is not optional here. It is what makes the fiber actually work. Think of this as building a constipation diet plan over a few weeks, not a one-day experiment you judge after a single meal.
When constipation should not be self-managed
Most constipation responds to dietary changes over time. But some symptoms need medical attention rather than another dietary experiment. If you are experiencing sudden severe constipation with no clear cause, blood in your stool, significant abdominal pain, vomiting alongside constipation, unexplained weight loss, constipation alternating with diarrhea, or new constipation that persists despite several weeks of dietary changes, those symptoms are worth discussing with a doctor.
Key Takeaways
- Kiwi and prunes have the strongest research support among foods that relieve constipation, with multiple randomized controlled trials behind both.
- Fiber works only when paired with adequate fluid. More fiber without more water often makes constipation worse.
- Soluble fiber sources like oats, chia, ground flaxseed, and pears tend to be the gentlest starting point for people sensitive to digestive side effects.
- Adding multiple high-fiber foods at once is the most common reason people feel worse after trying natural constipation remedies. One at a time works better.
- Yogurt and kefir may help some people, but they are lower-leverage than the whole foods on this list.
This post is for informational purposes only and does not constitute medical advice. If you are experiencing persistent, severe, or unexplained digestive symptoms, please consult your healthcare provider.
This is Post 6 of The Fiber Series. The series also covers types of dietary fiber, soluble vs insoluble fiber, 10 best fiber-rich foods for digestion, 7 signs you are not eating enough fiber, and more.
FAQ
Prunes and kiwi have the strongest research support for immediate constipation relief, with randomized trial evidence showing improved stool frequency within a few days of consistent use. Neither works instantly the way a laxative does, but they are the fastest-acting whole foods on this list.
Start with oats, kiwi, or ground flaxseed. These are the lowest-fermentation options and least likely to cause gas when introduced gradually. Avoid stacking beans, lentils, and raw vegetables all at once. That combination is a reliable way to make constipation and bloating worse before it gets better.
It depends on ripeness. Ripe bananas contain soluble fiber and are generally fine. Unripe bananas contain resistant starch that can slow digestion and worsen constipation in some people. If bananas are part of your routine, make sure they are ripe. The peel should have some brown spots.
Kiwi and oats are your best starting point. Both soften stool without the gas-producing fermentation that comes with beans or cruciferous vegetables. Add one at a time, keep portions modest, and increase fluid intake alongside them. Foods that soften stool without adding aggressive bulk are the right call when you are already bloated.
Usually because fiber was increased too fast, fluid intake did not increase alongside it, or rapidly fermentable foods were added first. High fiber foods for bowel movements only work well when introduced gradually with enough water. The type of fiber and the pace of increase both matter more than the total grams.
Some research suggests probiotic-containing foods may support regularity. The evidence is stronger for concentrated probiotic supplements than for fermented foods alone. Plain yogurt with live cultures is low-risk and may help some people, but it is not the highest-leverage option among the foods that relieve constipation on this list.
Sources
- https://pubmed.ncbi.nlm.nih.gov/37126812/
- https://pubmed.ncbi.nlm.nih.gov/36247043/
- https://pubmed.ncbi.nlm.nih.gov/29398337/
- https://pubmed.ncbi.nlm.nih.gov/30661699/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC7718840/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC4113128/
- https://pubmed.ncbi.nlm.nih.gov/36316826/
