Most constipation improves with a combination of dietary changes, more movement, better hydration, and simple habit shifts. Fewer than three bowel movements per week is the standard threshold for constipation, but straining, hard stools, or feeling like you can’t fully empty are just as much a part of the picture. The good news: you can address all of these without medication in many cases.
Eat More Fiber, but the Right Kinds
Fiber is the single most effective dietary tool for constipation, yet most people fall well short of what they need. The recommended daily intake is 25 grams for women and 38 grams for men. The average American gets roughly half that.
Not all fiber works the same way, and understanding the difference helps you choose better foods. Large, coarse insoluble fiber particles (the kind in wheat bran, whole grains, and vegetable skins) physically irritate the gut lining, triggering it to secrete water and mucus. Gel-forming soluble fiber (found in psyllium husk, oats, and flaxseed) holds onto water like a sponge, resisting the dehydration that normally happens as stool moves through the colon. Both types need to survive intact all the way through your digestive tract to do their job. That’s why heavily processed “fiber-enriched” products don’t always deliver the same benefit as whole food sources.
The result of both mechanisms is the same: softer, bulkier stool that’s easier to pass. If your current fiber intake is low, increase it gradually over one to two weeks. Adding too much too fast causes bloating and gas, which discourages people from sticking with it.
Foods With the Strongest Evidence
Three foods have been tested head-to-head in people with chronic constipation: green kiwifruit (two per day), prunes (about 100 grams per day, roughly 10 to 12 prunes), and psyllium husk (12 grams per day). All three significantly increased the number of complete, spontaneous bowel movements after four weeks. Prunes contain sorbitol, a natural sugar alcohol that draws water into the colon, giving them a mild osmotic effect on top of their fiber content. Kiwifruit contains an enzyme that may aid digestion and has a particularly gentle effect, with fewer reports of bloating than psyllium.
Other reliably helpful foods include beans, lentils, chia seeds, pears, and broccoli. Building these into meals consistently matters more than eating a large amount on a single day.
Drink Enough Fluid
When your body is low on water, the colon compensates by pulling more water out of stool to maintain your overall fluid balance. The result is harder, drier stool that’s difficult to pass. A large analysis of U.S. adults found a clear dose-response relationship: people in the lowest quarter of daily fluid intake had significantly higher constipation risk, while those in the highest quarter cut their risk nearly in half compared to that lowest group.
There’s no magic number that works for everyone, but aiming for roughly 2.5 to 3 liters of total daily fluid (from water, coffee, tea, soup, and water-rich foods) puts most adults in the range associated with the lowest constipation risk. Fiber and fluid work as a team. Increasing fiber without adequate hydration can actually make things worse, because dry fiber absorbs water from the colon rather than adding it.
Move Your Body Regularly
Physical activity stimulates the nerve network that runs along the wall of your intestines, increasing the frequency and strength of the muscle contractions that push stool forward. Aerobic exercise in particular, things like walking, cycling, swimming, or jogging, has the most consistent evidence for improving constipation symptoms.
The general recommendation is at least 150 minutes of moderate activity per week, which works out to about 30 minutes on most days. You don’t need intense workouts. A brisk daily walk is enough to make a measurable difference, especially if you’ve been largely sedentary. Even a short walk after meals can take advantage of the natural increase in gut motility that happens when the stomach stretches with food.
Change Your Position on the Toilet
Standard sitting toilets position your body at roughly an 80 to 90 degree angle between your torso and thighs. In this posture, the muscle that wraps around the rectum (the puborectalis) creates a kink that partially blocks the exit path. Squatting opens the anorectal angle to about 100 to 110 degrees, straightening the rectum and making evacuation easier.
You don’t need a squat toilet to get this benefit. A simple footstool placed in front of your toilet raises your knees above your hips and mimics a squatting position. One study found that using a footstool cut average defecation time roughly in half (about 56 seconds versus 113 seconds) and significantly reduced self-reported straining. Leaning your upper body slightly forward while using the stool enhances the effect further, particularly for older adults.
Build a Consistent Bathroom Routine
Your colon is most active in the morning and after meals, driven by a reflex triggered when food enters the stomach. Taking advantage of this natural rhythm by sitting on the toilet at the same time each day, ideally after breakfast, trains your body to expect and respond to the urge. Give yourself five to ten unhurried minutes. Rushing or ignoring the urge to go teaches the rectum to tolerate being full, which dulls the signal over time and makes constipation worse.
Over-the-Counter Laxatives
When lifestyle changes aren’t enough on their own, two main categories of laxatives are available without a prescription. Osmotic laxatives (like polyethylene glycol, sold as MiraLAX, or lactulose) work by drawing water into the bowel, softening stool. They’re generally considered safe for regular use and are the first choice for most adults. Bloating and nausea are the most common side effects. If you have kidney problems, avoid magnesium-based osmotic laxatives, since your kidneys may not be able to clear the extra magnesium efficiently.
Stimulant laxatives (like senna or bisacodyl) work differently. They directly activate the nerve network in the colon wall, increasing contractions and reducing water absorption. They’re effective but more likely to cause cramping. Long-term use has been linked to structural changes in the colon, including loss of the natural folds that help move stool. These are best reserved for occasional use rather than a daily habit.
Probiotics: Modest but Real Benefits
Certain probiotic strains may help, though the effects are smaller than those of fiber or laxatives. One well-studied strain, Bifidobacterium lactis HN019, was tested in people with fewer than three bowel movements per week. Both a high and low dose increased weekly bowel movement frequency by about 1.7 to 2.0 additional movements compared to placebo. That’s a meaningful change if you’re currently going only once or twice a week, but it’s not a dramatic shift. Probiotics are most useful as one piece of a broader strategy rather than a standalone fix.
When Constipation Needs Medical Attention
Most constipation is functional, meaning there’s no underlying disease causing it. But certain patterns warrant a closer look. Constipation that starts suddenly without an obvious cause (like a medication change or travel), unexplained weight loss, blood in the stool, or persistent abdominal pain are all signals that something beyond diet and habits may be going on. These symptoms can overlap with conditions that benefit from early detection, so they’re worth bringing up promptly rather than waiting to see if they resolve.