Stimulating bowel movements: what options are available and how strong the evidence is
ca. 23 Minuten
Key points
The most reliable way to stimulate bowel movements is to focus on three measures also recommended by official bodies: get more fiber from food, drink enough, and exercise regularly. The German Nutrition Society (DGE) recommends at least 30 grams of fiber per day for adults. Psyllium husks can be an addition; supplements do not replace dietary changes.
This article assesses each common approach individually: what it aims to achieve, what evidence supports it, what to watch out for, and who it may not be suitable for. Whenever the sources reviewed do not provide an answer, that is stated explicitly in the text — rather than giving an estimated figure.
Chapter 1 explains how to recognize a change. Chapter 2 presents the three evidence-based target values, and Chapter 3 covers warning signs. From Chapter 4 onward, each option is discussed in turn; Chapter 5 provides a direct comparison of the three ways to increase fiber.
What to expect in this article
1. What does “stimulating bowel movements” actually mean?
2. Which target values are supported by evidence?
3. What do official bodies recommend — and when should you see a doctor?
4. Option 1: Fiber from food
5. Options 2 and 3: Psyllium husks and fiber supplements compared
6. Options 4 and 5: Fluid intake and physical activity
7. Options 6 and 7: Probiotics and laxatives
8. Option 8: Microbiome analysis — what it can and cannot show
9. What none of these options can do
10. Conclusion
Frequently asked questions
Sources
Fiber from food
Fruit, grains, vegetables, and legumes soften stool. The DGE guideline is at least 30 grams per day.
Fluid intake
IQWiG recommends 1.5 to 2 liters per day. Without fluids, fiber cannot swell.
Physical activity and daily routine
The WHO recommends 150 to 300 minutes of moderate physical activity per week. A consistent daily routine also helps.
Psyllium husks and bulking agents
Bulk-forming fiber supplements — only with enough fluids.
What does “stimulating bowel movements” actually mean?
Stimulating bowel movements means two things: making stool softer and getting bowel transit into a rhythm that feels normal to you.
The sources reviewed do not establish a universal number of bowel movements a person should have, so none is given here. What matters is not a target number, but a change from your own normal pattern.
Why consistency is more informative than frequency
Stool consistency describes how much water it contains. Dietary fiber binds water in the intestines, making stool softer and easier to pass.
According to the German Nutrition Society (DGE, 2021), dietary fiber affects both the transit time of food through the stomach and intestines and the amount and consistency of stool, as well as how often the bowels are emptied. That is exactly why diet comes first on this topic.
Hard stool leads to a second problem: excessive straining. According to IQWiG (2025), straining can worsen symptoms and cause pain when hemorrhoids are enlarged.
Key point: To determine whether your bowel movements are normal, what matters is not a specific frequency, but how they differ from your own previous pattern.
How this article differs from related topics
This article deals exclusively with stool frequency and stool consistency. For how to support your digestion overall—including bloating, gas, and eating patterns—see the guide Stimulating digestion. You can find a structured weekly meal plan in the article Gut reset: meal plan.
Which target values are supported by evidence?
Three figures keep coming up on this topic, all from identifiable institutions. They are not guarantees of effectiveness, but guidelines and recommendations.
Source: DGE 2021, IQWiG 2025, WHO 2020
30 grams of fiber: the DGE recommendation
The German Nutrition Society (DGE) recommends that adults consume at least 30 grams of fiber per day (DGE, 2021). This figure refers to total daily intake from food, not to a single product. The DGE (2021) also considers increased fiber intake to have a protective effect against cardiovascular disease, type 2 diabetes, obesity, high blood pressure, colon and breast cancer, and the risk of death.
1.5 to 2 liters: the fluid intake from the IQWiG guide
The Institute for Quality and Efficiency in Health Care (IQWiG) lists 1.5 to 2 liters per day as the recommended fluid intake when it comes to avoiding constipation and excessive straining (IQWiG, 2025). This figure is mentioned in connection with dietary changes and exercise, not on its own.
150 to 300 minutes: the WHO physical activity recommendation
The World Health Organization (WHO) recommends that adults do 150 to 300 minutes of moderate-intensity aerobic activity or 75 to 150 minutes of vigorous-intensity aerobic activity per week, as well as muscle-strengthening activities on at least two days (WHO, 2020). This recommendation applies to health in general and is not a specific treatment for constipation.
What do official bodies recommend—and when should you see a doctor?
The most concise summary of self-help measures comes from IQWiG and lists exactly the three approaches discussed here.
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“To prevent constipation and excessive straining during bowel movements, people are often advised to change their diet, drink enough fluids (1.5 to 2 liters per day), and exercise regularly.”
Institute for Quality and Efficiency in Health Care (IQWiG)
“What can you do yourself to treat hemorrhoids?”, gesundheitsinformation.de, 2025
Important context: This information comes from the IQWiG guide to hemorrhoids. The recommendation specifically refers to avoiding constipation and straining—it is not a general treatment recommendation for every form of constipation.
Even so, it’s the right reference for this article because it describes exactly what the phrase “stimulate a bowel movement” is about: softer stools without straining. IQWiG (2025) also often recommends a high-fiber diet with fruit, grains, vegetables, and legumes to soften stools.
Warning signs that call for more than a home remedy
Certain accompanying signs suggest that something more than a low-fiber diet is behind the change.
These signs call for a doctor’s visit, not a self-treatment experiment
- → Significant weight loss, blood in the stool, fever, or paleness—according to IQWiG (2023), these symptoms are more likely to indicate another intestinal condition.
- → Any amount of blood in the stool—according to IQWiG (2023), blood in the stool should always be examined by a doctor to determine the cause.
- → Severe abdominal pain, a hard abdomen, fever, nausea, a racing heart, and general weakness—according to IQWiG (2026), it’s important to seek medical help promptly if you have these signs.
- → A sudden, persistent change in bowel habits—if there’s no obvious cause, it should be checked by a doctor rather than self-treated for weeks.
Constipation can also be a symptom of another condition. According to IQWiG (2026), diverticular disease usually causes pain in the lower left abdomen and can also cause bloating, constipation, or diarrhea.
Option 1: Fiber from food—how strong is the evidence for this approach?
Best for: anyone who wants to make a lasting change
Fiber from regular foods is the basic option—and the only one mentioned by both the DGE and IQWiG in the sources reviewed. It works by binding water in the intestines, which affects stool consistency. IQWiG (2025) lists fruit, grains, vegetables, and legumes for this purpose.
The most common mistake is increasing too quickly: doubling your fiber intake in one day often causes bloating. Gradually increasing it over two to three weeks is easier to tolerate, and your fluid intake needs to increase too.
How to tell you're having a high-fiber week
- ✓ Whole grains are the rule, not the exception - whole-grain bread, pasta, rice, and oats provide most of your daily amount.
- ✓ Legumes are on the menu several times a week - according to IQWiG (2025), lentils, chickpeas, and beans are among the recommended groups.
- ✓ Vegetables are a main ingredient, not a garnish - one-third to half of the meal.
- ✓ Increase your fluid intake accordingly - fiber binds water and needs it.
Arguments for
✓ Recommended consistently by DGE (2021) and IQWiG (2025).
✓ No additional product or ongoing costs required.
✓ According to DGE (2021), the benefits extend beyond bowel movements.
Arguments against
✗ Requires real changes to your shopping and cooking routine.
✗ Increasing the amount too quickly often causes bloating and a feeling of fullness.
✗ Doesn't work without sufficient fluid intake.
Assessment: Getting fiber from ordinary foods has the broadest evidence base and costs nothing extra - but it requires the biggest changes to your daily routine.
Options 2 and 3: Psyllium and fiber supplements compared
When your diet doesn't provide enough fiber, reaching for a product seems like the obvious choice. Two options are often confused, even though the evidence supporting them is very different.
Option 2: Psyllium and psyllium husks
Best for: anyone who can reliably drink enough fluids
Psyllium is a plant-based, water-swelling fiber. It binds water and thereby increases stool volume - the same mechanism as fiber from foods, just more concentrated.
According to IQWiG (2025), studies suggest that plant-based fiber products such as psyllium may reduce the frequency of bleeding from enlarged hemorrhoids. This is evidence of a benefit in a clearly defined context, not general proof of effectiveness for every type of constipation.
One condition is non-negotiable: According to IQWiG (2025), anyone taking psyllium must be especially careful to drink enough fluids. Bulk-forming agents without fluids are not a partial solution, but the wrong approach.
Arguments for
✓ According to IQWiG (2025), studies suggest they may help with hemorrhoid symptoms.
✓ Easy to dose and use without changing your entire diet.
✓ Plant-based and neutral enough in taste for muesli, yogurt, or water.
Arguments against
✗ Not appropriate to use without sufficient fluid intake, according to IQWiG (2025).
✗ The study evidence is from the context of hemorrhoids.
✗ Does not replace a high-fiber diet, but complements it.
Assessment: Psyllium is the best-supported supplement — but only for people who can actually drink enough fluids.
Option 3: Fiber supplements
Best for: no one expecting an effect, based on current evidence
Fiber supplements promise the recommended amount in capsule or powder form. The idea is obvious, but the evidence does not support it.
According to IQWiG (2023), it has not been proven that additional fiber supplements help. This is inconvenient because supplements would be the easiest option. Lack of evidence is not proof that they are ineffective — but it is also no basis for a recommendation.
Arguments for
✓ Does not require changes to shopping or cooking habits.
✓ The amount can be measured precisely.
✓ Practical to use on the go and during shift work.
Arguments against
✗ According to IQWiG (2023), it has not been proven that they help.
✗ Ongoing costs without proven benefit.
✗ Does not provide the other components of high-fiber foods.
Assessment: This option has the weakest evidence base — anyone looking to spend money would be better off investing in high-fiber foods.
The three fiber approaches side by side
The following table compares the three approaches using the same five criteria. Where the sources reviewed make no statement, this is explicitly noted in the cell rather than estimating a figure.
| Criterion | Fiber from food | Psyllium | Fiber supplements |
|---|---|---|---|
| What is the goal? | Soften stools through your daily diet | Specifically add bulking fiber | Get concentrated fiber without changing your diet |
| What is proven? | DGE (2021): Recommended amount 30 g per day · IQWiG (2025): A high-fiber diet makes stools softer | IQWiG (2025): Studies suggest less bleeding from hemorrhoids | IQWiG (2023): It has not been proven that they help |
| What should you keep in mind? | Increase the amount gradually and increase your fluid intake accordingly | IQWiG (2025): Take particular care to drink enough | Does not replace dietary changes; you pay the ongoing costs yourself |
| How quickly does it work? | No proven timeframe in the sources used | No proven timeframe in the sources used | No proven timeframe in the sources used |
| Who is it unsuitable for? | Blood in the stool or a persistent change in bowel habits should first be assessed by a doctor | For anyone who cannot reliably drink enough fluids | For anyone expecting a proven effect |
The line about speed of effect is not an oversight: Neither the DGE nor IQWiG specify a timeframe for when a change should occur in the cited sources.
Options 4 and 5: Fluid intake and exercise
These two options cost nothing and, in the IQWiG quote from Chapter 3, are given equal standing alongside dietary changes.
Option 4: Drink enough
Best for: anyone who is currently increasing their fiber intake
Fiber absorbs water. Without enough fluid, it does not swell properly—and a higher-fiber diet can then feel even more uncomfortable than before.
IQWiG (2025) recommends 1.5 to 2 liters per day in connection with avoiding constipation and excessive straining. This amount is no magic formula, but the general range on which the other recommendations are based.
Arguments for
✓ Costs nothing and can be started right away.
✓ IQWiG (2025) specifies a concrete amount.
✓ A prerequisite for fiber and psyllium husks to work.
Arguments against
✗ Drinking alone generally does not resolve the issue.
✗ Follow any fluid intake amount prescribed by a doctor.
✗ Difficult to keep up in everyday life without an established routine.
Assessment: Drinking enough is not a solution on its own, but it is a condition for the other options to work.
Option 5: Exercise and a regular daily routine
Best for: anyone who spends most of the day sitting
Regular exercise is the third way to help in the IQWiG recommendation—and the only one with an international guideline on how much to do. The WHO (2020) recommends 150 to 300 minutes of moderate or 75 to 150 minutes of vigorous aerobic activity per week, along with muscle-strengthening activity on at least two days.
A daily routine includes fixed meal times, setting aside enough time to use the toilet, and avoiding excessive straining. According to IQWiG (2025), straining can worsen symptoms and cause pain when hemorrhoids are enlarged.
Arguments for
✓ Explicitly named by IQWiG (2025) as one of three ways to help.
✓ The WHO (2020) specifies a concrete weekly amount.
✓ A regular daily routine costs nothing.
Arguments against
✗ The WHO recommendation is general and does not specify an effect on bowel movements.
✗ Difficult to put into practice for shift workers or people with limited mobility.
✗ Takes weeks of consistency for a routine to become established.
Assessment: Exercise and a daily routine offer the best balance of effort and overall benefit—even though the reviewed sources do not quantify their effect on bowel movements.
In brief
Fluid intake and exercise are the two options that cost nothing yet appear alongside dietary changes in the same recommendation. IQWiG (2025) recommends 1.5 to 2 liters per day, while the WHO (2020) recommends 150 to 300 minutes of moderate exercise per week. Neither figure is a dosage for treating constipation—they describe the framework in which dietary changes can have an effect.
Options 6 and 7: Probiotics and laxatives
Two other approaches are often mentioned — and point in very different directions.
Option 6: Probiotics from foods or supplements
Best for: anyone who wants to try them without firm expectations
Probiotics are living microorganisms such as lactic acid bacteria or certain yeasts. They are found in foods such as plain yogurt and in dietary supplements; they are often believed to have health-promoting effects (IQWiG, glossary entry on probiotics).
There is a clear statement about tolerability: According to IQWiG (2023), probiotics are generally well tolerated; mild side effects such as bloating occur only rarely. However, good tolerability is not the same as proven effectiveness. The reviewed source material contains no evidence-based claim about probiotics for the specific purpose of “stimulating bowel movements” — so none is made here.
Arguments for
✓ According to IQWiG (2023), generally well tolerated.
✓ Possible through foods such as plain yogurt, at no extra cost.
✓ Easy to try alongside the basic measures.
Arguments against
✗ No evidence-based claim about bowel movements in the reviewed source material.
✗ According to IQWiG (2023), mild side effects such as bloating can occur rarely.
✗ Products incur ongoing costs without guaranteed benefits.
Assessment: Probiotics are well tolerated, but they are not an option you can count on.
Option 7: Laxatives
Best for: use only after consulting a doctor or pharmacist
Laxatives directly affect bowel activity. That's why this article will neither recommend nor provide dosages for them. Choosing a laxative, its dosage and how long to use it are matters for your doctor's office or pharmacy — a blog article doesn't know your medical history or what medications you take.
Key point: Laxatives are not a home remedy, and this article deliberately does not provide dosages — ask your doctor or pharmacist for advice.
Arguments for
✓ An established medical treatment in certain situations.
✓ Pharmacists can offer personalized advice on selection and use.
✓ Can be a useful addition to treatment under medical supervision.
Arguments against
✗ Not intended for long-term self-use without advice.
✗ May mask an underlying cause that needs to be investigated.
✗ Existing conditions and other medications are not taken into account here.
Assessment: Laxatives are the only option here for which this article deliberately gives no instructions.
Option 8: Microbiome analysis — what it shows and what it doesn't
Best for: anyone who wants a written record of their gut microbiome composition
A microbiome analysis examines which bacteria are present in the gut and in what proportions—a snapshot, not an intervention.
A microbiome test measures the composition of the gut flora, not bowel movement frequency. Anyone expecting a lab report to explain why they have not had a bowel movement for three weeks will be disappointed.
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Price: €189.00 (instead of €219.00) · Sample type: Stool sample · Processing time: approx. 20–25 working days · Laboratory: ISO-certified laboratory analysis, ISO 27001
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The entry-level option shows the composition of the gut flora, the ratio of protective to harmful bacteria, the gut environment based on pH, fungal colonization, and signs of dysbiosis—also in a report of around 15 pages. It does not include the FODMAP index or enterotype determination. Like the Complete version, the test is not a diagnostic procedure and does not provide information about bowel movement frequency.
Price: €139.00 · Sample type: Stool sample · Processing time: approx. 20–25 working days · Laboratory: ISO-certified laboratory analysis, ISO 27001
To the Basic Microbiome TestAll prices and product details are current as of July 28, 2026. Prices and processing times may change; the relevant information is always on the respective product page.
Is a microbiome analysis worthwhile for this issue?
The following comparison also lists cases where a test is the wrong answer.
Makes sense for you if …
… you have already implemented the basic measures and want to know what your gut flora is made up of.
… you’re interested in bacterial diversity, enterotype, and FODMAP index as a basis for discussion with a specialist.
… you prefer a written lab report to simply monitoring yourself.
Not recommended if …
… you have blood in your stool or your bowel habits have suddenly and persistently changed—those are reasons to see a doctor.
… you expect a test result to replace dietary changes—it does not.
… you expect an assessment of your bowel movement frequency—a microbiome analysis does not provide that.
Assessment: A microbiome analysis is a snapshot, not an intervention—it complements the basic options but replaces neither them nor medical evaluation.
What none of these options can do
All eight options address diet, fluids, exercise, or taking stock. None of them investigates the underlying cause.
No test or home remedy replaces medical evaluation if warning signs occur. This applies to blood in the stool as well as significant weight loss, fever, or paleness.
No test or home remedy replaces medical evaluation if warning signs occur.
A second limitation concerns expectations about how quickly results will appear. The sources reviewed do not specify how long it should take for a change to occur. Anyone expecting results after three days is measuring against a figure that does not exist.
A third limitation is individual variation: According to IQWiG (2023), people’s reactions to foods vary greatly.
Finally, constipation can be a symptom of an underlying condition. Diverticula, for example, are common—according to IQWiG (2026), around 13% of people under 50 have diverticula, compared with about 50% of people over 70. Irritable bowel syndrome is also common: IQWiG (2023) estimates that around 10 to 20 out of every 100 people have irritable bowel syndrome.
Conclusion
If you want to stimulate bowel movements, the three options with the strongest evidence are increasing fiber from food, drinking enough fluids, and getting regular exercise. IQWiG (2025) recommends these same three.
Psyllium is the best-supported supplement, but only if you drink enough fluids. According to IQWiG (2023), fiber supplements have no proven effect, while probiotics are merely well tolerated. Laxatives should be discussed with a doctor or pharmacist.
Specifically, this means starting with your diet, gradually increasing your fiber intake over two to three weeks toward the DGE guideline of 30 grams per day, drinking 1.5 to 2 liters daily, and incorporating physical activity into your week at the level recommended by the WHO (2020). If you’d like to take a look at the composition of your gut flora after that, a microbiome analysis is a sensible next step—as a snapshot, not a substitute for making changes.
Frequently asked questions
How can I naturally stimulate my bowel movements?
Through three approaches cited together by IQWiG (2025): changing your diet to include more fiber, drinking enough—1.5 to 2 liters a day—and exercising regularly. The DGE (2021) recommends that adults consume at least 30 grams of fiber per day.
Does psyllium help with bowel movements?
According to IQWiG (2025), studies suggest that plant-based remedies containing fiber, such as psyllium, may reduce the frequency of bleeding from enlarged hemorrhoids. Important: According to IQWiG (2025), anyone taking psyllium should make sure to drink enough.
Do fiber supplements help?
According to IQWiG (2023), it has not been proven that additional fiber supplements help. Lack of evidence does not automatically mean they are ineffective, but it is also not a basis for recommending them.
When should I seek medical advice for constipation?
According to IQWiG (2023), additional symptoms such as significant weight loss, blood in the stool, fever, or paleness are more likely to indicate another intestinal disease; blood in the stool should always be examined by a doctor. According to IQWiG (2026), it is important to seek medical help promptly if you have severe abdominal pain, a hard abdominal wall, fever, nausea, a racing heart, and general weakness.
Can a microbiome test show why my bowel movements are irregular?
No. A microbiome test measures the composition of gut flora, not bowel movement frequency. It provides a snapshot of bacterial diversity and proportions, but does not provide a diagnosis. Warning signs should be assessed by a doctor.
Would you like to know what your gut flora is made up of?
The mybody® gut flora MICROBIOME test analyzes a stool sample in an ISO-certified laboratory. It complements the basic measures in this article—it does not replace them or provide a diagnosis.
View the Complete Microbiome Test All gut tests at a glanceYou might also be interested in
→ Abdominal pressure: identifying and understanding the causes
When a feeling of pressure or tightness in your abdomen accompanies changes in bowel movements.
→ The most reliable microbiome tests for your gut flora
What to consider before deciding on a gut flora analysis.
→ Gut glossary: all bacteria and markers in your gut flora
Reference work with over 6,000 microbiome biomarkers—from protective bacteria and fiber metabolizers to the figures in your test results.
Sources
- IQWiG / gesundheitsinformation.de: What can you do yourself to treat hemorrhoids? (2025) — gesundheitsinformation.de
- German Nutrition Society (DGE): Dietary Reference Values for Fiber (2021) — dge.de
- World Health Organization: Guidelines on Physical Activity and Sedentary Behaviour (2020) — ncbi.nlm.nih.gov
- IQWiG / gesundheitsinformation.de: What helps with irritable bowel syndrome—and what doesn’t? (2023) — gesundheitsinformation.de
- IQWiG / gesundheitsinformation.de: Irritable bowel syndrome (2023) — gesundheitsinformation.de
- IQWiG / gesundheitsinformation.de: Diverticular disease and diverticulitis (2026) — gesundheitsinformation.de
The verbatim quote in Chapter 3, the recommended fluid intake of 1.5 to 2 liters, the recommendation to eat high-fiber foods, the study reference on psyllium, and the statement about straining come from [1]. The recommended fiber intake of 30 grams per day and the information on transit time, stool consistency, and protective effects come from [2]. The exercise recommendation comes from [3]. The statements about fiber supplements, probiotic tolerability, and individual responses to foods come from [4]. Warning signs, the evaluation of blood in the stool, and the prevalence of irritable bowel syndrome come from [5]. Additional warning signs and information about diverticula come from [6]. The definition of probiotics comes from the “Probiotics” glossary entry on gesundheitsinformation.de, which has no date and is therefore cited in the text rather than listed. Product details are from the mybody® product pages, accessed on July 28, 2026. All other sources mentioned in the text are cited at the relevant point with the institution and year.
mybody® Editorial & Expert Team
Gut Health Microbiome Fiber Nutritional Science
This article was written and reviewed by the mybody® Editorial and Expert Team. The team brings together expertise in nutrigenetics, microbiome and gut science, blood test interpretation, nutritional science, and laboratory diagnostics.
Published on July 28, 2026 · Last updated on July 28, 2026
Medical disclaimer: This article is for general information and does not replace medical advice, diagnosis, or treatment. Persistent or sudden changes in bowel habits, blood in the stool, significant weight loss, fever, or severe abdominal pain should be evaluated by a doctor. A microbiome test is not a diagnostic procedure.
