The Ultimate Guide to Managing IBS: Natural Remedies, Diet and Lifestyle Changes

Written by Karly Raven, BHSc - Naturopath and SIBO Specialist, Nourished Gut Clinic
Last updated: August 2026

Irritable bowel syndrome affects around one in five Australians at some point, and for many of them it is not a passing inconvenience. It is bloating that builds through the day, pain that arrives without warning, and a bowel pattern that never quite settles. IBS does not damage the bowel and it is not dangerous, but that framing can feel dismissive when your symptoms are shaping what you eat, where you go and how you feel in your own body.

This guide covers what actually helps: the evidence behind the common natural remedies, how to use diet without ending up more restricted than when you started, and the question worth asking if nothing has worked so far.

At a glance

IBS is a real, diagnosable condition, but it is a description of symptoms rather than an explanation of them. Managing it well means reducing symptoms in the short term while working out what is driving them underneath.

In this post you will learn which natural remedies have evidence behind them, how to use the low FODMAP diet without damaging your microbiome, why a meaningful proportion of IBS cases turn out to be SIBO, and what to do when standard advice has not held.

Jump to a section

1. Understanding IBS and its symptoms
2. Natural remedies with evidence behind them
3. Diet: what helps, and what quietly makes things worse
4. Could it be SIBO? The overlap between IBS and bacterial overgrowth
5. Lifestyle changes that genuinely shift symptoms
6. Supplements worth considering
7. Frequently asked questions

1. Understanding IBS and its symptoms

IBS is a disorder of gut-brain interaction. That means the structure of the bowel is normal on investigation, but the way it functions, and the way it communicates with the nervous system, is not. Motility can be too fast or too slow, the gut can become hypersensitive to normal amounts of gas and stretch, and the signalling between gut and brain amplifies rather than settles the signal.

Common symptoms include:

• Abdominal pain or cramping. Often relieved, at least partly, by a bowel motion.
• Bloating and distension. Frequently worse as the day goes on and after meals.
• Altered bowel habit. Constipation, diarrhoea, or an alternating pattern between the two.
• Mucus in the stool. Common and not usually a sign of anything sinister.
• A sense of incomplete evacuation. The feeling of never quite finishing.

IBS is diagnosed clinically, using the Rome IV criteria, once conditions such as coeliac disease and inflammatory bowel disease have been excluded. That exclusion step matters. If you have not had coeliac serology, a faecal calprotectin, or a full blood count and iron studies, those are worth doing before settling on an IBS label.

Symptoms that need medical review rather than management: blood in the stool, unintended weight loss, symptoms that wake you at night, a family history of bowel cancer or IBD, or new onset symptoms after age 50. None of these belong in an IBS bucket.

2. Natural remedies with evidence behind them

Not everything marketed for IBS has research behind it. These four do, and they are the ones I use most in clinic.

• Peppermint oil. One of the better studied options for IBS pain and cramping. It relaxes intestinal smooth muscle, which reduces spasm. Enteric coated capsules matter here, because uncoated peppermint releases in the stomach and commonly causes reflux. It is worth noting that peppermint can worsen reflux in people who already have it.
• Probiotics. Useful, but strain specific rather than generic. Bifidobacterium infantis 35624 and certain Lactobacillus plantarum strains have the most support for bloating and global IBS symptoms. Generic multi-strain products are far less predictable, and in some people with an overgrowth they make bloating worse rather than better. Strain, dose and timing all matter.
• Slippery elm. A demulcent that forms a soothing film over the gut lining. Most useful where there is irritation, urgency or a reactive bowel. It also adds soluble fibre, which is why it can help both constipation and loose stools.
• Ginger. Supports gastric emptying and reduces nausea. Genuinely helpful where symptoms sit high in the abdomen, and where meals feel like they sit for hours.

These reduce symptoms. They do not, on their own, change why the symptoms are there. That distinction is the whole reason people cycle through remedies for years without lasting change.

3. Diet: what helps, and what quietly makes things worse

Diet is the most powerful lever in IBS and the one most often used badly. Restriction works quickly, which is exactly why it becomes a trap.

The low FODMAP diet

The low FODMAP diet, developed at Monash University, reduces fermentable carbohydrates that draw water into the bowel and ferment rapidly. It helps a substantial proportion of people with IBS, and the symptom improvement can be dramatic.

It is also designed as a short term therapeutic and diagnostic phase, not a way of eating. Monash themselves recommend the elimination phase runs for two to six weeks, followed by a structured reintroduction. Staying in restriction long term reduces intake of the fermentable fibres that feed beneficial bacteria, and the microbiome shifts accordingly. The diet that helped in month one can be part of the problem by month twelve.

The pattern I see constantly is someone two years into a low FODMAP diet, with a food list that has only ever got shorter, reacting to more things than when they started.

This is why I developed the SIBO Restore Diet, a staged approach built around reintroduction and microbiome support rather than open ended restriction. The principle is restoration over restriction, and the aim is a wider diet at the end than at the beginning.

Fibre, carefully

Fibre is not one thing. Soluble fibre, found in oats, psyllium, chia and linseed, is generally well tolerated and helps both constipation and loose stools. Insoluble fibre, the coarse structural fibre in wheat bran and raw vegetables, commonly aggravates pain and bloating in a sensitive gut. If fibre has made you worse, it is usually a question of type and pacing rather than a reason to avoid it.

Meal spacing

This is underrated. The migrating motor complex, the cleansing wave that sweeps the small intestine between meals, only runs when you are not eating. Constant grazing suppresses it. Leaving three to four hours between meals, and an overnight fast, does more for bloating in some people than any supplement.

Hydration and common triggers

Dehydration worsens constipation, and inadequate fluid alongside added fibre reliably makes things worse. Caffeine stimulates colonic motility, alcohol irritates the gut lining and impairs the barrier, and lactose is a genuine trigger for a meaningful proportion of adults. A two week food and symptom diary tells you more about your own triggers than any list.

4. Could it be SIBO? The overlap between IBS and bacterial overgrowth

This is the question worth asking if you have done everything above and still have symptoms.

Small intestinal bacterial overgrowth is an excess of bacteria in the small intestine. Two things happen: bacteria that normally live further down in the colon migrate upward, and bacteria that legitimately belong in the small intestine proliferate beyond what that stretch of bowel is designed to hold. Either way, fermentation happens in the wrong place, and the gas produced causes exactly the bloating, pain and altered bowel habit that define IBS.

The overlap is well documented, though you will see wildly varying numbers quoted. Prevalence estimates for SIBO in IBS range from under 10 per cent to over 70 per cent across studies, and that range reflects genuine differences in testing method, substrate and diagnostic thresholds rather than uncertainty about whether the association is real. A 2026 meta-analysis in Frontiers in Microbiology found people with IBS were substantially more likely to test positive for SIBO than controls, with a pooled odds ratio of 5.71. The honest summary is that SIBO is a common and frequently missed driver of IBS symptoms, not that it explains most cases.

SIBO is worth investigating if:

• Bloating is your dominant symptom and worsens through the day
• Symptoms began after food poisoning, a course of antibiotics, or abdominal surgery
• You react to an increasing number of foods over time
• Probiotics or fibre reliably make you worse
• You have low iron, low B12 or other unexplained deficiencies
• Standard IBS management has not held

Testing is done by breath test, measuring hydrogen and methane. Hydrogen sulphide cannot be measured by breath testing in Australia, and its proposed diagnostic criteria have not been validated, so there is no three gas test to ask for here. The hydrogen sulphide pattern is recognised and treated clinically on presentation rather than by a test result. In my own practice I also use fructose as a testing substrate, because it identifies fructose malabsorption that is either primary or secondary to an overgrowth. That distinction changes the treatment plan considerably.

If this section sounds like your situation, these three posts go into the detail:

• The three types of SIBO: hydrogen, methane and hydrogen sulphide
• SIBO breath testing: how it works and how to read your results
• SIBO treatment: what actually works and why it keeps coming back

5. Lifestyle changes that genuinely shift symptoms

The gut-brain axis is not a soft add-on in IBS. It is central to the mechanism, which means these are clinical interventions rather than general wellness advice.

• Nervous system regulation. Stress alters motility, increases visceral sensitivity and changes barrier function directly. Gut directed hypnotherapy has research support comparable to dietary intervention for IBS. Diaphragmatic breathing before meals is smaller but free, and it shifts you into the state where digestion actually happens.
• Movement. Regular moderate exercise improves transit and reduces symptom severity. Walking after meals is particularly useful for bloating. High intensity training on an empty tank tends to be counterproductive when someone is already depleted.
• Sleep. Poor sleep increases pain sensitivity and worsens symptoms the following day. This is a measurable effect, not a vague one. A consistent wake time does more than a perfect bedtime routine.

6. Supplements worth considering

These sit underneath diet and lifestyle rather than replacing them, and they should be matched to your symptom pattern rather than taken as a set.

• Digestive enzymes. Useful where meals feel heavy and slow, or where symptoms begin within the first hour after eating.
• Magnesium. Magnesium citrate or oxide draws water into the bowel and helps constipation predominant IBS. Magnesium glycinate does not do this and is better suited where the goal is nervous system support.
• L-glutamine. An amino acid used by the cells lining the small intestine. Most relevant where barrier integrity is compromised, such as after infection or a course of antimicrobials.
• Soluble fibre. Psyllium has reasonable evidence in IBS, but it needs adequate water and a slow build. Starting at a full dose is the usual reason people conclude it does not suit them.

If you are taking more than four or five things and cannot say what each one is for, that is worth reviewing. A large supplement stack is often a sign that the underlying driver has not been identified.

Frequently Asked Questions

Can IBS be cured, or only managed?

It depends on what is driving it. Where there is an identifiable and treatable cause, such as SIBO, an unresolved post-infectious change, bile acid malabsorption or a specific carbohydrate intolerance, treating that cause can resolve symptoms rather than just manage them. Where symptoms are driven mainly by gut-brain hypersensitivity, the realistic goal is substantial and durable improvement rather than cure. Either way, an IBS diagnosis is a starting point for investigation, not the end of one.

How long should I stay on a low FODMAP diet?

Two to six weeks for the elimination phase, then structured reintroduction. That is the protocol as Monash designed it. Staying in restriction beyond that reduces the fermentable fibre your beneficial bacteria depend on, and the microbiome changes in response. If you have been low FODMAP for months or years and your tolerance has narrowed rather than widened, the diet has stopped being a tool and become part of the problem.

Why do probiotics make my bloating worse?

Usually because you have an overgrowth. If there are already too many bacteria in the small intestine, adding more organisms and the prebiotic fibres many products contain increases fermentation in the exact place it is already excessive. It is a useful clinical signal. Reacting badly to probiotics or to added fibre is one of the patterns that makes me want a breath test.

Do I need testing, or can I just treat the symptoms?

If symptoms are mild and respond well to diet and lifestyle, symptom management is entirely reasonable. Testing earns its place when symptoms are persistent, when they have relapsed after previous treatment, when you are reacting to a growing list of foods, or when there are nutrient deficiencies. The purpose of a test is to answer a question that changes what you do next. If the result would not change the plan, it is not worth running.

Is IBS caused by stress?

Stress is a genuine modulator of IBS, not usually its cause. It alters motility, increases visceral sensitivity and affects gut barrier function, so it reliably makes symptoms worse. But being told your symptoms are "just stress" without any investigation is a common and frustrating experience, and it leaves treatable drivers unfound. Both things are true: stress matters, and it is rarely the whole explanation.

Ready to get support for your gut health?

If you have worked through the standard advice and your symptoms are still shaping your week, the next step is not another elimination diet. It is working out what is actually driving them.

If you want a practical starting point, the free 3-Day Bloat Fix is a short plan you can begin this week.

The Nourished Gut Program is our six month process for identifying the drivers of IBS and rebuilding digestive function properly. Testing and supplements are not included in the program fee. It is application only and we take five new clients each month. Apply for a free Digestive Strategy Session, a 20 minute telehealth call, and we will tell you honestly whether it suits your case.

Karly Raven, BHSc is a naturopath, microbiome restoration specialist, and SIBO expert. She is the founder of the Nourished Gut Clinic and creator of the Feed Forward methodology and the SIBO Restore Diet. Karly works with people with IBS, SIBO, IBD and chronic gut conditions, and mentors health practitioners through karlyraven.com.

References

healthdirect Australia. Irritable bowel syndrome (IBS). healthdirect.gov.au

Monash University. Starting the low FODMAP diet. monashfodmap.com

Lu, H. (2026). Relationship between small intestinal bacterial overgrowth and irritable bowel syndrome: a systematic review and meta-analysis. Frontiers in Microbiology, 17.

This blog is for educational purposes only and does not constitute medical advice. Please consult a qualified health practitioner before making changes to your treatment plan.