Most constipation resolves with a few straightforward changes to what you eat, drink, and how you move. The key levers are fiber, fluids, physical activity, and a handful of specific foods that act as gentle, natural laxatives. Here’s what actually works and how to put it into practice.
Eat More Fiber (and the Right Kind)
Fiber is the single most effective dietary tool for constipation, and most people don’t get enough. Current guidelines recommend about 14 grams of fiber for every 1,000 calories you eat per day, which works out to roughly 25 to 30 grams for most adults. The average American gets about half that.
Not all fiber works the same way. Insoluble fiber, the “roughage” in whole grains, vegetables, and wheat bran, passes through your digestive system mostly intact. It adds physical bulk to stool and helps push things along. Soluble fiber, found in oats, beans, apples, and flaxseed, dissolves in water and forms a gel in your gut. That gel softens stool and makes it easier to pass. You want both types, so eating a variety of high-fiber foods matters more than focusing on any single one.
If your current diet is low in fiber, increase your intake gradually over a week or two. Adding too much too fast can cause bloating and gas, which makes the whole experience worse before it gets better.
Specific Foods That Relieve Constipation
Some foods go beyond basic fiber and have compounds that actively draw water into your intestines, creating a natural laxative effect.
Prunes and prune juice: Prunes contain sorbitol, a sugar alcohol that pulls water into the gut and softens stool. A reasonable starting point is about six prunes per day or four to eight ounces of prune juice. Many people notice results within a day or two.
Kiwifruit: Green kiwifruit has performed surprisingly well in clinical testing. In a trial published by the American College of Gastroenterology, people who ate two green kiwifruits daily (without the skin) had significantly more bowel movements per week than those taking psyllium husk, a common fiber supplement. Kiwi also contains an enzyme that may help with digestion beyond its fiber content alone.
Other reliable options: Pears, figs, and beans are all high in both soluble and insoluble fiber. Chia seeds and ground flaxseed absorb water and bulk up stool when you eat them with plenty of liquid.
Drink Enough Water
Fiber works by absorbing water, so eating more fiber without drinking enough fluid can actually make constipation worse. Research has found a significant association between water intake and stool frequency, stool consistency, and the sensation of blockage. People who drink less water tend to have harder, less frequent stools.
There’s no single magic number, but aiming for at least eight cups of water a day is a reasonable baseline for most adults. You may need more if you’re increasing your fiber intake, exercising regularly, or living in a hot climate. Coffee counts toward your fluid intake and can stimulate the colon on its own, though relying on caffeine alone isn’t a long-term strategy.
Move Your Body
Physical activity stimulates the natural contractions of your colon (peristalsis), which is the wave-like motion that moves stool through your intestines. Exercise shortens colon transit time, meaning food waste spends less time sitting in your gut drying out and hardening. Even moderate activity like walking or cycling makes a measurable difference. Research suggests that people who are physically active for four or more hours a week have notably better bowel function than those who are mostly sedentary.
You don’t need intense workouts. A 20- to 30-minute walk after a meal can be enough to get things moving, especially in the morning when your colon is naturally more active.
Change Your Toilet Posture
The standard seated position on a Western toilet creates a kink in your lower bowel. A muscle called the puborectalis wraps around the rectum and keeps it bent at an angle, which is useful for holding stool in but works against you when you’re trying to go. Squatting relaxes that muscle and straightens out the colon, giving stool a more direct path out. X-ray imaging confirms that the rectum straightens significantly in a squatting position compared to sitting upright.
You don’t need to squat on the toilet rim. A small footstool (around 7 to 9 inches tall) placed at the base of the toilet lets you raise your knees above your hips, which mimics the squatting angle. Many people find this makes elimination easier and more complete, sometimes within the first use.
Probiotics: Modest but Real Benefits
Certain probiotic bacteria can help with constipation, though the evidence is less clear-cut than it is for fiber or fluids. A systematic review found that strains of Bifidobacterium lactis improved bowel movement frequency and stool consistency in some studies. However, other trials using different B. lactis products found no effect. The benefits appear to be strain-specific, meaning not every probiotic supplement on the shelf will help.
If you want to try probiotics, look for products that specify the bacterial strain (not just the species) and choose ones that have been tested for digestive health. Fermented foods like yogurt, kefir, sauerkraut, and kimchi are another way to support gut bacteria, though their effects on constipation specifically are less well-studied than supplement forms.
Magnesium as a Natural Osmotic
Magnesium citrate is available over the counter and works by pulling water into the intestines, which softens stool and triggers colon contractions. It’s one of the faster-acting natural options, with results typically arriving within 30 minutes to 6 hours. It’s available as a liquid or tablet at most pharmacies.
Magnesium is effective for occasional use, but it’s not something to rely on daily without guidance. It can interfere with the absorption of certain medications, including some antibiotics and specific antiviral drugs. If you take prescription medications, check for interactions before using it. People with kidney problems should also be cautious, since the kidneys are responsible for clearing excess magnesium from the body.
Build a Routine
Your colon responds to habit. Eating meals at regular times triggers a reflex that pushes stool toward the rectum, and this reflex is strongest in the morning and after meals. Giving yourself unhurried time on the toilet after breakfast, even if you don’t feel an immediate urge, can help retrain your body’s rhythm over a few weeks. Ignoring the urge to go when it does arise teaches your body to suppress the signal, which makes constipation worse over time.
Combining several of these strategies works better than any single change. A practical starting plan: increase fiber-rich foods gradually, drink more water, take a daily walk, and use a footstool at the toilet. Most people with occasional constipation see improvement within a few days to a week. If constipation persists beyond three weeks despite these changes, or if you notice blood in your stool, unexplained weight loss, or sudden changes in bowel habits after age 50, those are signs worth getting evaluated.