Most constipation responds well to simple changes in diet, hydration, and daily habits. Before reaching for over-the-counter laxatives, a combination of fiber-rich foods, adequate water, and better bathroom positioning can restore regular bowel movements within days to a couple of weeks. Here’s what actually works, based on clinical evidence.
Know When It’s Actually Constipation
Constipation isn’t just about frequency. Clinically, it’s defined as experiencing two or more of the following at least 25% of the time: straining, lumpy or hard stools, or a sensation of incomplete evacuation. Many people assume they’re constipated simply because they don’t go every day, but anywhere from three times a day to three times a week falls within the normal range. The key signals are stool consistency and how much effort it takes.
Eat More Fiber (but the Right Kinds)
Fiber is the single most effective dietary tool for constipation, and most people don’t get enough. Current guidelines recommend 14 grams of fiber for every 1,000 calories you eat daily, which works out to roughly 25 to 30 grams for most adults. The average American gets about half that.
The two types of fiber work differently. Insoluble fiber, found in whole wheat, vegetables, and nuts, speeds the passage of food through your digestive tract and adds bulk to stool. Soluble fiber, found in oats, beans, and fruits, absorbs water and forms a gel that softens stool and makes it easier to pass. You need both, and the easiest way to get them is through whole foods rather than supplements.
If you’re currently eating very little fiber, increase your intake gradually over a week or two. A sudden jump can cause bloating and gas, which discourages people from sticking with the change.
Prunes and Kiwis Outperform Supplements
Two foods have particularly strong evidence behind them. Dried plums (prunes) were tested head-to-head against psyllium husk, a common fiber supplement, in a clinical trial. Participants eating six prunes twice a day increased their complete spontaneous bowel movements from an average of 1.7 per week to 3.5. Psyllium brought that number to 2.8. Prunes won by a meaningful margin, likely because they contain both fiber and sorbitol, a natural sugar alcohol that draws water into the colon.
Green kiwifruit has also shown real results. A trial reviewed by the American College of Gastroenterology found that eating two green kiwifruits per day (without the skin) significantly increased bowel movement frequency in people with mild constipation. Kiwis contain a unique enzyme that helps break down proteins in the gut, along with fiber and water content that soften stool. Both prunes and kiwis are worth trying before more concentrated supplements.
Drink Enough Water
Fiber can only do its job if there’s enough water in your system. Low fluid intake makes stool harder and reduces its overall weight, directly contributing to constipation. A study published in the Current Research in Nutrition and Food Science Journal found a significant association between water intake and both stool frequency and stool consistency. People drinking under 1,000 milliliters per day had notably worse outcomes than those drinking more.
There’s no magic number, but aiming for at least 2,000 milliliters (about eight cups) of water daily is a reasonable baseline. Coffee and tea count toward your fluid intake, though caffeinated drinks can have a mild diuretic effect. If you’re increasing your fiber intake, you should increase your water intake at the same time, or you risk making constipation worse rather than better.
Try Magnesium Citrate
Magnesium draws water into the intestines through osmosis, softening stool and sometimes stimulating bowel contractions. Magnesium citrate is the form most commonly used for this purpose because it’s better absorbed than magnesium oxide, which is cheaper but less efficient. A daily dose of 250 to 500 milligrams is considered safe for most adults with healthy kidney function, according to Mayo Clinic.
Start at the lower end. Magnesium citrate can work quickly, sometimes within hours, and too much will cause loose stools or diarrhea. It’s a useful short-term tool while you build up longer-term habits like dietary fiber, but some people use it regularly without issues. If you have kidney problems, check with your doctor first, since your kidneys are responsible for clearing excess magnesium.
Change Your Bathroom Position
The standard sitting position on a Western toilet isn’t ideal for passing stool. A muscle called the puborectalis loops around your rectum like a sling, pulling it forward to create a tight angle that helps with continence. When you sit upright, this angle only partially opens. Squatting widens it significantly more, creating a straighter path for stool to pass through.
You don’t need to squat on your toilet. A small footstool (about 6 to 9 inches tall) placed in front of the toilet lets you raise your knees above your hips, mimicking a squatting position. This is one of the simplest changes you can make, and many people notice a difference immediately. Leaning forward slightly with your elbows on your knees enhances the effect.
Move Your Body
Physical activity stimulates the muscles in your intestinal walls, helping move stool through the colon. Even moderate exercise like a 20 to 30 minute walk can make a noticeable difference, especially if you’re otherwise sedentary. You don’t need intense workouts. Consistent daily movement matters more than occasional hard exercise. Many people find that a walk after a meal is particularly effective because eating already triggers contractions in the colon (known as the gastrocolic reflex), and movement amplifies that signal.
What About Probiotics?
Probiotics are heavily marketed for digestive health, but the evidence for constipation is mixed. One well-studied strain, Bifidobacterium lactis HN019, had shown promise in earlier small studies. But a rigorous randomized trial published in JAMA Network Open found that eight weeks of daily supplementation did not outperform a placebo in increasing bowel movement frequency. Both groups improved, suggesting a strong placebo effect.
This doesn’t mean probiotics are useless for gut health broadly, but if constipation is your main concern, your money and effort are better spent on fiber, hydration, and the other strategies above. If you still want to try a probiotic, look for products with multiple strains and give it at least four weeks before judging the results.
When Natural Remedies Aren’t Enough
Most occasional constipation resolves with the changes described above. But some symptoms signal something more serious. Go to an emergency room if you haven’t had a bowel movement for a prolonged period and you’re also experiencing severe abdominal pain or major bloating. Vomiting, blood in your stool, or unexplained weight loss alongside constipation are also warning signs that need prompt evaluation. If constipation simply persists for longer than a week despite making changes, it’s worth scheduling an appointment to rule out underlying causes like pelvic floor dysfunction or medication side effects, both of which require different treatment approaches.