Despite what your doctor, another healthcare provider, or a well-meaning person in your life may have told you, having a bowel movement less than once a day is not healthy. Notice I said not healthy, not “not normal”. Plenty of things are common and considered normal without being good for us. And when it comes to bowel frequency, common and healthy are not the same thing.

If that statement surprised you, keep reading. Because understanding why you need to poop every single day is one of the most practical things you can do for your long-term health, and it’s especially relevant if you’re a woman navigating the hormonal shifts of perimenopause or beyond.

Why regular bowel movements matter

Your body has four ways to eliminate what it no longer needs: bowel movements, urine, sweat, and breath. Each serves a different purpose, and none of them are optional. Bowel movements in particular are the primary route for eliminating:

• Undigested food material, including fiber and any other components your body doesn’t digest well or tolerate
• Sloughed-off intestinal cells (the cells lining your intestinal wall live only about seven days before being replaced)
• Remnants of the bacteria that lived and died in your digestive tract
• Fat-soluble substances the body has finished with, including bilirubin, metabolized hormones like estrogen, and the byproducts of medication metabolism

That last point deserves some emphasis. Every other elimination pathway, including urine, sweat, and breath, is water-based. Fat-soluble substances cannot travel through a water-based medium efficiently. The bowel, via bile, is essentially the only reliable exit route for fat-soluble waste. When bowel movements are infrequent, those substances have nowhere to go.

Think of it this way: what would your kitchen look like if you only took out the garbage every few days? The mess doesn’t disappear. It just sits there. The same principle applies in your colon, and the consequences are more than just uncomfortable.

When waste sits in the colon for too long, it can alter the microbial environment there and allow substances to be reabsorbed back into the body. Research has linked infrequent bowel movements and chronic constipation to urinary tract infections, urinary and fecal incontinence, diverticulitis, rectal prolapse, hemorrhoids, anal fissures, and colorectal cancer. A 2023 systematic review and meta-analysis found that constipation is associated with more than double the risk of developing Parkinson’s disease, with constipation sometimes preceding the motor symptoms of the disease by decades. And beyond the clinical consequences, irregular bowel movements simply reduce quality of life. I mean, have you ever noticed how a good poop makes you feel lighter and cleaner?

(A note for anyone considering a detox or cleanse: your bowel is the primary elimination pathway for detoxification. If you’re not moving your bowels daily before you begin, the main exit route isn’t working properly, and any detox protocol will be working against itself. Get your bowels moving first.)

How hormones affect your bowel habits

This section is for the women reading this, because the connection between hormones and bowel function is one of the most underappreciated aspects of digestive health in women, and it starts well before menopause.

Across the menstrual cycle

If you’ve ever noticed that your bowel habits shift across your cycle, you’re not imagining it. Many women experience constipation and bloating in the week or so before their period, followed by looser stools or diarrhea in the first day or two of bleeding. Research suggests that up to 73% of menstruating women report gastrointestinal symptoms that vary by cycle phase, though individual experiences vary considerably.

The mechanism follows the hormonal rhythm of the cycle. After ovulation, progesterone rises. Progesterone relaxes smooth muscle throughout the body, including the smooth muscle of the intestinal wall, which slows gut motility and can lead to constipation and bloating. When progesterone drops sharply at the onset of menstruation, prostaglandins rise to trigger uterine contractions. Because the uterus sits in close proximity to the intestinal tract, those prostaglandins affect the gut as well, speeding up motility and often causing loose stools or cramping in the first day or two of bleeding.

Your own experience across your cycle is the most reliable data you have about how your body specifically responds to these shifts. Research can tell us what many women notice. Only you can know what your body does.

In perimenopause and beyond

The same progesterone that fluctuates across your monthly cycle begins to decline more persistently in perimenopause, and it declines first, before estrogen. This matters for gut health because the gut-slowing effect of progesterone, which used to come and go with your cycle, can become more sustained as progesterone levels drop and hormone fluctuations become less predictable. Many women in perimenopause notice that their bowel habits become more erratic or that constipation becomes more frequent, even when nothing else in their diet or routine has changed. This is a real, physiologically supported phenomenon, and it’s worth paying attention to.

The estrogen connection

There is another layer to this that is specific to constipation in women: the relationship between bowel regularity and estrogen clearance. The liver processes excess estrogen and packages it into bile, which is then released into the intestines for elimination via the stool. This is one of the body’s primary mechanisms for keeping estrogen levels in balance.

Here’s where bowel frequency becomes directly relevant to hormonal health. Certain gut bacteria produce an enzyme called beta-glucuronidase, which can deconjugate estrogen in the intestine, converting it from its inactivated form back into active estrogen that can be reabsorbed into circulation. The collection of gut bacteria involved in this process is now known as the estrobolome. The longer estrogen-containing waste sits in the colon, the more opportunity this reactivation process has to occur. Regular, daily bowel movements support timely estrogen clearance and limit the window for reabsorption. This is one concrete reason why constipation in women is not just a comfort issue, particularly in perimenopause and menopause. It has upstream hormonal implications.

How is constipation defined?

Constipation is defined based on a combination of frequency, stool consistency, and the effort required to eliminate. According to the Rome IV Diagnostic Criteria, updated in 2016, a person meets the criteria for functional constipation when two or more of the following are present for at least the last three months, with symptom onset at least six months prior:

• Straining during at least 25% of bowel movements
• Lumpy or hard stools (types 1 or 2 on the Bristol Stool Scale, as shown below) during at least 25% of bowel movements
• Sensation of incomplete evacuation during at least 25% of bowel movements
• Sensation of anorectal obstruction or blockage during at least 25% of bowel movements
• Need for manual assistance (such as digital evacuation or pelvic floor support) to facilitate at least 25% of bowel movements
• Fewer than three spontaneous bowel movements per week

I want to be transparent about that last criterion, because I disagree with it. Three bowel movements per week is not sufficient for the kind of daily elimination your body needs to manage toxin clearance, hormone balance, and general digestive health. The Rome IV criteria are a clinical diagnostic framework, not a wellness standard. If you are having fewer than one bowel movement per day and you don’t meet the other criteria listed above, you may not qualify for a clinical diagnosis of constipation, but your bowel habits are still worth addressing.

If you notice constipation symptoms alongside abdominal pain occurring at least one day per week, your provider may consider a diagnosis of IBS with constipation (IBS-C) rather than functional constipation alone. The distinction matters for treatment, which is one more reason to work with a practitioner rather than self-diagnosing. As well, if your constipation is a result of opioid use, opioid-induced constipation is its own diagnosis.

What causes constipation in women?

As with most symptoms, constipation is rarely caused by just one thing and certainly the cause can vary from person to person. Here are the most common contributors, many of which interact with each other:

1. Diet and digestion

Insufficient fiber and water are the most common culprits. Insoluble fiber adds bulk to stool and helps it move through the intestine efficiently, while adequate hydration keeps stool soft enough to pass. Food sensitivities or intolerances, particularly to dairy, are another common factor. When the gut is reacting to a food, motility can slow as part of the inflammatory response.

Inadequate digestive function can also contribute. Insufficient stomach acid means protein isn’t broken down properly before reaching the colon, where a larger undigested load can slow transit. Insufficient bile output from the gallbladder means fat isn’t being digested efficiently, and excess undigested fat reaching the colon can also slow motility.

Finally, excessive intake of red meat, refined grains, and alcohol can slow transit for some people.

2. Magnesium status

Magnesium deficiency is one of the most common and most overlooked contributors to constipation. Magnesium supports the relaxation of smooth muscle throughout the body. When magnesium is low, intestinal muscles can remain in a state of low-grade tension that impairs the rhythmic contractions needed for regular bowel movements. Many women, particularly in midlife, are not getting adequate magnesium from diet alone.

It’s also worth noting that stress increases magnesium excretion through the kidneys, meaning that chronically stressed women, a description that fits many of us in midlife, are using up magnesium faster than they might realize. If your stress load is high and your bowels are sluggish, low magnesium levels may be part of the picture.

3. Medications and supplements

Opioids, certain antidepressants, antacids containing calcium or aluminum, and excessive use of laxatives can all slow bowel function. High-dose iron or calcium supplementation is also a common but frequently unrecognized cause, particularly relevant for women who supplement these nutrients for bone health.

4. Hormonal and physiological factors

As described above, progesterone slows gut motility, which is why constipation is common in the luteal phase of the menstrual cycle, during pregnancy, and in perimenopause. Hypothyroidism slows metabolic processes throughout the body, including digestion, and is more common in women than men. Pelvic floor dysfunction, which can result from pregnancy, childbirth, diabetic neuropathy, or simply from habitually ignoring the urge to defecate, can also impair the mechanics of elimination.

5. Lifestyle factors

Lack of movement is one of the clearest lifestyle contributors. Physical activity stimulates gut motility through mechanisms that aren’t fully understood, but the relationship is consistent and well-documented. Chronic stress activates the sympathetic nervous system, which diverts resources away from digestive function, and contributes to a magnesium deficient state as discussed above.

6. Microbial factors

Overgrowth of bacteria or yeast in the small intestine (sometimes called SIBO) can impair motility and may actually worsen constipation with increased fiber intake, which is one reason that “just eat more fiber” isn’t always the right first step. If you find that adding fiber makes your constipation worse rather than better, this is worth investigating with a healthcare provider.

7. Neurological conditions

Neuromuscular disorders including ALS, multiple sclerosis, muscular dystrophy, cerebral palsy, and paraplegia can affect the nerve signals that drive gut motility. Constipation is also now recognized as an early, but non-specific symptom of Parkinson’s disease, sometimes appearing years or even decades before motor symptoms develop.

What can you do about it?

The most important thing I can tell you here is this: the goal is to identify and address the underlying cause, not just to manage the symptom. Laxatives can provide temporary relief, but they don’t resolve why your bowels are slow in the first place. With that framing in mind, here are the categories of intervention that are worth exploring:

1. Start with the foundations.

Fiber and water come first, because without them nothing else works optimally. If you’re not sure whether you’re getting enough of either, that’s where to begin.

2. Look at your diet for potential contributors.

Dairy is the most common dietary trigger for constipation, and eliminating it for three to four weeks is a reasonable first experiment if you’re not sure whether it’s a factor for you. Reducing red meat, refined wheat, and alcohol may also be worth exploring.

3. Support your microbiome.

A healthy, diverse gut microbiome supports regular bowel function in multiple ways, including producing the short-chain fatty acids that stimulate colonic motility. Certain probiotic strains have been studied specifically for constipation and IBS-C. If you’d like to explore probiotic supplementation, my Fullscript dispensary includes a curated constipation support collection with the products I recommend.

4. Consider your magnesium status.

Given how common magnesium deficiency is and how directly it affects smooth muscle function, this is one of the first nutrients worth evaluating. Food sources include leafy greens, nuts, seeds, and legumes. Whether supplementation makes sense for you depends on your individual situation. My Fullscript collection includes options here as well.

5. Add flaxseed.

Flaxseed has good clinical evidence behind it for constipation relief. Both the fiber (which adds bulk and feeds beneficial gut bacteria) and the oil fraction (which has a direct stimulatory effect on gut smooth muscle via cholinergic pathways) contribute to its effect. Ground flaxseeds or flaxseed oil can be added to smoothies, oatmeal, or yogurt.

6. Try prunes or kiwi.

The evidence for prunes as a constipation remedy is genuinely strong. Multiple randomized controlled trials have found whole prunes to be at least as effective as psyllium for improving stool frequency and consistency, and the effect appears to come from a combination of fiber, sorbitol, and polyphenols working together. If you’ve avoided them because you thought they’d taste like medicine, try one. They taste like dried fruit (which makes sense, because they are dried fruit).

If prunes aren’t your thing, green or golden kiwifruit is worth trying. Research comparing kiwifruit, prunes, and psyllium found all three effective for improving constipation symptoms, with kiwifruit producing the fewest side effects and the highest satisfaction among participants. Two kiwifruit per day is the amount used in most studies. Like prunes, kiwifruit works through a combination of fiber and other bioactive compounds, not fiber alone.

7. Establish a consistent toileting routine.

Your bowel has a rhythm, and it responds to consistency. Going to the bathroom at the same time each day, particularly in the morning after waking and drinking water, but before eating, can help train that rhythm over time. This is sometimes called bowel retraining, and it takes patience, but it works.

8. Adjust your position on the toilet.

The squatting position creates a more favorable anorectal angle for elimination than the standard seated position on a Western toilet. Elevating your feet on a small stool, or even leaning forward with your elbows on your knees, can make a meaningful difference for some people.

9. Move your body.

Regular physical activity supports gut motility. This doesn’t need to be intense exercise… consistent daily movement of any kind is beneficial.

10. Don’t ignore the urge.

When your body signals that it’s time to go, go. Repeatedly suppressing that urge teaches the colon and rectum that it isn’t safe to release, which over time can contribute to pelvic floor dysfunction and worsen constipation.

11. Address food sensitivities.

If you suspect a food sensitivity is contributing to your constipation, working with a practitioner to identify it properly is more effective than guessing.

If you’ve worked through the foundational steps and are still struggling, please don’t just keep adding more fiber and hoping for the best. There are underlying causes, including SIBO, pelvic floor dysfunction, hypothyroidism, and others, that require proper identification and targeted support. That’s exactly the kind of work worth doing with a knowledgeable practitioner. If you would like to see if I am the best practitioner for you, you can schedule a free 15-minute discussion here.

Frequently Asked Questions

Is it really necessary to poop every day?

From a functional health perspective, yes. Daily bowel movements support your body’s primary route for eliminating fat-soluble waste, including metabolized hormones and toxins processed by the liver. Less frequent elimination means that waste spends more time in the colon, with more opportunity for reabsorption and microbial disruption. Three bowel movements per week may be the clinical threshold for a constipation diagnosis, but it is not a wellness standard.

Can menopause cause constipation?

It can, and perimenopause is often where the shift begins. Progesterone, which slows gut motility, declines first and most significantly in perimenopause. As hormone levels become less predictable and progesterone drops overall, many women find that their bowel habits change even without any changes to their diet or lifestyle. This is a real physiological phenomenon, not something to simply accept as inevitable.

How do I know if my constipation is hormonal or something else?

In practice, it’s often both. Hormonal changes can slow motility, but diet, hydration, magnesium status, microbiome health, stress, and activity level all interact with that hormonal backdrop. Tracking your symptoms in relation to your cycle, your stress levels, and your diet over a few weeks can reveal patterns that are worth bringing to a healthcare provider. A practitioner trained in integrative or functional nutrition can help you sort out which factors are most relevant for you specifically.

What’s the difference between constipation and IBS-C?

Both involve constipation, but IBS with constipation (IBS-C) also includes recurrent abdominal pain occurring at least one day per week, associated with bowel habit changes. If your constipation is accompanied by significant ongoing abdominal pain, IBS-C may be a more accurate diagnosis and may require a somewhat different approach to treatment.

Are laxatives safe to use regularly?

Occasional use of certain laxatives can be appropriate, but regular reliance on laxatives, particularly stimulant laxatives, can reduce the bowel’s ability to function independently over time. If you find yourself needing a laxative regularly to have a bowel movement, that’s a signal worth paying attention to rather than managing indefinitely with a product.

Conclusion

Regular bowel movements are not a minor detail of digestive health. They are the primary mechanism by which your body removes fat-soluble waste, clears metabolized hormones, and keeps the microbial environment of your colon in balance. For women navigating the hormonal shifts of perimenopause and beyond, that connection between bowel regularity and hormonal health is especially direct.

If your bowels aren’t moving daily, your body is asking for attention, not necessarily a laxative. The cause is almost always findable, and addressing it is almost always worth the effort.

If you are constipated, your body is not broken. It is communicating. Stay curious about what it’s telling you.

Image by Gabor Monori via Unsplash.

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