Several things reliably help you poop: eating the right types of fiber, drinking enough water, moving your body, and even changing your position on the toilet. Most people who struggle with occasional constipation can fix it with a few targeted changes rather than a single magic bullet. Here’s what actually works and why.
Fiber Matters, but the Type Is Critical
Not all fiber helps you poop. The two types that actually produce a laxative effect work through different mechanisms, but both share one requirement: they have to survive digestion and still be present in your stool to do anything useful.
Large, coarse insoluble fiber particles (the kind found in wheat bran, for example) physically irritate the lining of your large intestine. That irritation triggers your gut to secrete water and mucus, which softens stool and gets things moving. Gel-forming soluble fiber, like psyllium husk, works differently. It absorbs water and holds onto it stubbornly, resisting the colon’s natural tendency to dry stool out. Both mechanisms lead to bulkier, softer, easier-to-pass stools.
Here’s the catch: many popular “fiber-rich” products contain fermentable fibers like inulin, fructooligosaccharides, or wheat dextrin. These get broken down by gut bacteria before they reach the end of your colon, so they contribute nothing to stool bulk. Some, like wheat dextrin and finely ground wheat bran, can actually make constipation worse. If you’ve been adding fiber supplements without results, check the label. Psyllium husk and coarse wheat bran are the best-studied options that consistently work.
Current dietary guidelines recommend about 14 grams of fiber per 1,000 calories you eat. For most adults, that lands somewhere around 25 to 35 grams a day. If you’re well below that number, increasing your intake gradually (to avoid gas and bloating) is one of the most effective long-term fixes.
Foods That Act as Natural Laxatives
Prunes are the classic recommendation for a reason. They contain sorbitol, a sugar that your body doesn’t fully absorb. Sorbitol draws water into your intestines, softening stool and triggering the urge to go. Whole prunes work better than prune juice because they deliver more fiber and more sorbitol per serving with fewer calories. Five or six prunes a day is a reasonable starting point.
Kiwifruit is a less well-known option with strong evidence behind it. A systematic review of clinical trials found that eating two kiwifruits a day improved how often people with chronic constipation had bowel movements. Some studies used up to four per day, and even at that dose, participants didn’t report diarrhea. Kiwi contains both fiber and a protein-digesting enzyme that appears to help move things along the digestive tract. Two per day is a practical starting point; you can increase to four if needed, and the effect typically shows up within a few days to a few weeks.
Why Water Intake Changes Stool Consistency
Your large intestine’s job is to absorb water from digested food. When you’re dehydrated, it absorbs more aggressively, pulling extra water from your stool and leaving it hard, dry, and difficult to pass. Drinking adequate fluids throughout the day keeps stool softer. This is especially important if you’re increasing your fiber intake, since fiber needs water to do its job. Without enough fluid, adding fiber can actually make constipation worse.
There’s no universal number of glasses that works for everyone. Your needs depend on body size, activity level, climate, and diet. A simple check: if your urine is pale yellow, you’re likely drinking enough.
How Coffee Triggers a Bowel Movement
Coffee stimulates the release of a hormone called gastrin from your stomach lining. Gastrin ramps up the muscular contractions of your colon, a process called the gastrocolic reflex. This reflex is strongest in the morning, which is why that first cup of coffee often sends you to the bathroom within minutes. The effect depends partly on how ready your colon already is. If stool is sitting in the lower colon waiting for a push, coffee can trigger a bowel movement before you finish the cup. If the colon isn’t loaded, the effect is less dramatic. Both caffeinated and decaf coffee have this property, though caffeine adds extra stimulation.
Change Your Position on the Toilet
Sitting on a standard toilet puts your body at roughly a 90-degree angle, which partially kinks the pathway stool travels through. A sling-like muscle called the puborectalis wraps around your rectum and keeps it bent to prevent leakage when you’re upright. Sitting relaxes this muscle somewhat, but squatting relaxes it much more, widening the angle and creating a straighter path for stool to exit.
Research confirms that squatting leads to less straining and more complete evacuation compared to sitting. You don’t need to rebuild your bathroom. A small footstool (about 7 to 9 inches tall) placed in front of the toilet raises your knees above your hips, mimicking a squat. Leaning forward slightly with your elbows on your knees enhances the effect.
Exercise Speeds Up Your Colon
Physical activity directly reduces the time it takes food waste to travel through your colon. In one controlled study, participants who did 40 minutes of moderate aerobic exercise three times per week cut their total colon transit time nearly in half over 12 weeks, dropping from about 54 hours to 30 hours. The control group showed no change. The exercise started as simple walking and progressed to moderate-intensity aerobics.
You don’t need to train for a marathon. Walking, cycling, swimming, or any movement that raises your heart rate can help. The mechanical jostling of your intestines during movement, combined with increased blood flow to the gut, stimulates the wave-like contractions that push stool forward. Even a brisk 20-minute walk can help if you’re feeling backed up.
Probiotics That Improve Regularity
Certain probiotic strains have been shown to increase how often people poop and improve stool consistency. The two with the most clinical evidence are Bifidobacterium lactis and Lactobacillus casei Shirota. B. lactis primarily helps with frequency, meaning you go more often. L. casei Shirota appears to do more: studies found it reduced straining, pain during bowel movements, abdominal discomfort, and gas, on top of increasing frequency and improving stool texture.
Look for these specific strain names on probiotic labels. Many probiotic products contain strains with little or no evidence for constipation. Fermented foods like yogurt and kefir can contribute beneficial bacteria, but the strains and doses vary widely. A targeted supplement with one of these well-studied strains is a more reliable option if constipation is your primary concern.
Signs That Need Medical Attention
Most constipation responds to the strategies above. But certain symptoms signal something beyond a dietary fix. Blood in your stool, unintentional weight loss of 10 pounds or more, a sudden change in stool shape or size, or constipation that appears out of nowhere in someone over 50 all warrant a medical evaluation. Iron deficiency anemia alongside constipation is another red flag. These don’t necessarily mean something serious is wrong, but they need to be checked rather than managed at home.