Table of Contents
- What is functional medicine for gut health issues?
- What is ruled out before any functional testing?
- Which tests help, and how strong is the evidence?
- IBS management strategies that work alongside your GP
- Low FODMAP diet guidance: doing it properly
- What is included in a structured gut plan?
- When do you need a gastroenterologist?
- Conclusion
- Frequently Asked Questions
Last Updated: September 29, 2026
What is functional medicine for gut health issues?
Functional medicine for gut health issues is a doctor-led approach that looks at your whole story, not just your bowel. It means a longer history, a look at how diet, sleep, stress, medicines and other conditions interact, and validated tests where they are likely to change what we do. At Mojo Klinik, functional medicine means exactly that. Two AHPRA-registered medical doctors run the clinic, with more than 60 years of combined practice between them.
You have probably already been told your tests are normal. That is a common and frustrating place to sit. Many people with gut symptoms have standard bloods and a colonoscopy that come back clear, yet they still feel unwell. Functional medicine for gut health issues starts from that point and asks a different question: what else is going on?
Healthdirect on irritable bowel syndrome notes IBS affects about 1 in 5 people, so you are far from alone.

A doctor in a bright consultation room sitting with a patient, taking notes on a clipboard
What is ruled out before any functional testing?
Before any advanced testing, we rule out the conditions that must not be missed. This is the same first step your GP takes, and it matters more than any stool panel.
Coeliac disease is the clearest example. Coeliac Australia reports it affects about 1 in 70 Australians, and around 80% remain undiagnosed. Testing only works if you are still eating gluten beforehand. If you have already cut it out, the result can look normal when it is not.
We also check for anaemia and iron deficiency, thyroid function, inflammatory markers, and bowel screening where it is due. Free bowel screening is available every two years for eligible people aged 45 to 74 through the National Bowel Cancer Screening Program. People aged 45 to 49 need to request their first kit.
Red flags that need urgent attention
Some symptoms need a doctor soon, not a gut plan. These include blood in your stool, unexplained weight loss, symptoms that wake you at night, vomiting, trouble swallowing, iron deficiency, new symptoms after age 50, or a family history of bowel cancer or coeliac disease. If any of these apply to you, book with your GP promptly. A structured gut plan can wait. These signs cannot.
Which tests help, and how strong is the evidence?
Honesty matters here. Some tests change what we do. Others add cost without changing the plan.
|
Test |
What it shows |
Strength of evidence |
|---|---|---|
|
Coeliac serology |
Immune response to gluten |
Strong, if eating gluten |
|
Faecal calprotectin |
Gut inflammation |
Strong for IBD screening |
|
SIBO breath test |
Bacterial overgrowth |
Mixed, often false results |
|
Microbiome stool test |
Bacterial balance |
Limited, evidence scarce |
|
IgG food panel |
IgG antibodies to foods |
Not recommended |
The evidence is mixed for several popular tests. A 2024 clinical practice update in Neurogastroenterology and Motility, endorsed by European and American neurogastroenterology societies, found that the lactulose breath test has very low sensitivity and specificity for SIBO, and that the glucose breath test has a high false-positive rate in functional gut disorders, so results need careful interpretation. An international consensus statement in The Lancet Gastroenterology and Hepatology found that evidence supporting the clinical usefulness of microbiome testing is scarce, and that direct-to-consumer tests have no proven value in clinical practice. And ASCIA does not recommend IgG food antibody testing, which it describes as ineffective and unreliable. IgG to a food usually reflects exposure to that food, not harm from it.
IBS management strategies that work alongside your GP
IBS management works best as a partnership. Your GP continues to lead your care. We work in parallel, never instead of them.
A common mistake is looking for a single answer. In practice, symptoms usually respond to several small changes layered together. Regular meals, adequate sleep, gentle movement, and treating stress as a real trigger all help. So does reviewing medicines and supplements that can loosen the bowel or cause bloating. If you have IBS, our gut assessment service looks at these contributors together rather than one at a time.
Why stress shows up in your gut
The gut and the brain talk constantly along the vagus nerve, a direct line running from the base of your brain to your digestive tract. This is the gut-brain axis. When your nervous system stays switched on, digestion slows or speeds up, gut sensitivity rises, and normal amounts of gas feel like a lot more. That is why two people can eat the same meal and only one feels bloated.
Think of it like a kitchen with several appliances on one power board. One appliance is fine. Switch them all on and the board trips. Gut symptoms often work the same way.
You may recognise this pattern: a stressful week, and your gut is the first thing to notice. That is not imagination. It is physiology.
What actually helps
Breathing exercises that slow your heart rate, done for a few minutes before meals, can settle the nervous system before food arrives. Regular sleep and wake times matter more than most people expect. Gentle movement, such as a daily walk, supports normal gut motility. Psychological approaches such as gut-directed hypnotherapy and cognitive behavioural therapy have the strongest evidence in IBS, and your GP can discuss referral options.
Caffeine, alcohol and eating late at night are common aggravators. So is eating while rushed or distracted. Small changes here often take pressure off everything else in the plan.
What Happens at My First Appointment? →
Medicines and supplements worth reviewing
Some common medicines can loosen the bowel or cause bloating. Iron tablets, some pain relievers, and certain antidepressants are examples. Do not stop anything on your own. Bring your full list to your appointment, including supplements, and we can review it together with your GP. Transitioning away from harsh additives often requires replacing them with clean label gut supplements that support digestive harmony without triggering further irritation.
Probiotics are often asked about. The evidence is mixed and strain-specific, so we treat them as a trial with a clear start and review date rather than a permanent addition.
Low FODMAP diet guidance: doing it properly
The low FODMAP diet is a structured elimination and reintroduction process, not a permanent way of eating. FODMAPs are short-chain carbohydrates that ferment in the gut and draw in water. For some people, they trigger bloating, wind and cramping.
Done properly, it has three phases: strict elimination for a few weeks, planned reintroduction to find your triggers, then personalisation. Monash University research showed IBS symptoms improve in about 3 out of 4 people who follow a low FODMAP diet, and Monash recommends following it with guidance from an experienced dietitian.
What is included in a structured gut plan?
A structured plan starts with a detailed history. We ask about your symptoms, your diet, your sleep, your stress, your medicines and any other conditions. Then we review the results you already have, so nothing is repeated unnecessarily.
The part most plans leave out: maintenance
Most gut plans stop when symptoms settle. That is where the harder question starts. How do you keep the gains without living on a restricted diet forever? Maintenance means reintroducing foods where possible, keeping the changes that helped, and reviewing at set intervals.
What a written plan looks like
Your plan is a short document, not a textbook. It lists your main drivers, the changes we agreed on, any tests ordered, and the date we will review. It also names the red flags that mean you contact a doctor sooner. You keep a copy, and so does your GP if you ask us to send one.
When do you need a gastroenterologist?
You need a gastroenterologist when symptoms suggest something structural or inflammatory, or when a procedure is required. That includes persistent bleeding, unexplained weight loss, suspected inflammatory bowel disease, or symptoms that do not respond to a well-run plan.
The strongest gut plans combine three things: a doctor who takes a full history, tests chosen for a reason, and changes you can actually sustain.
Conclusion
Gut symptoms that persist despite normal tests are common, and they are worth a proper look. If that sounds like you, a doctor-led assessment can help you understand what is driving your symptoms and what to do next. Mojo Klinik offers longer consultations, functional pathology that goes beyond standard panels, and care that works in parallel with your GP. Get started with Mojo Klinik and a plan built around your history, your results and your goals.
Reviewed by Dr Maria Mackey, MBChB, FRACGP, FAARM.
Frequently Asked Questions
What is the functional medicine approach to gut health?
At Mojo Klinik, functional medicine means doctor-led care that looks at your full history, diet, sleep, stress and medicines. It uses validated tests to check for conditions like coeliac disease and inflammatory bowel disease, supports a diagnosis of IBS once other causes are excluded, then builds a structured plan. It works in parallel with your GP or gastroenterologist, never instead of them.
Are microbiome stool tests reliable for diagnosis?
The evidence for microbiome stool tests is scarce. An international consensus statement in The Lancet Gastroenterology and Hepatology found that evidence supporting the clinical usefulness of microbiome testing is scarce. They may provide some information, but they are not a substitute for validated tests such as coeliac serology or faecal calprotectin.
How does diet affect chronic gut symptoms?
Diet can play a significant role in managing conditions like IBS. A low FODMAP diet, guided by a dietitian, improves symptoms in about 3 out of 4 people with IBS, according to Monash University research. Other food sensitivities may also contribute. A doctor can help identify which dietary changes are worth trying and which are not supported by evidence.
When should I see a gastroenterologist for gut issues?
If you have red flags such as blood in your stool, unexplained weight loss, night symptoms, vomiting, trouble swallowing, iron deficiency, new symptoms after age 50, or a family history of bowel cancer, see a doctor promptly. These signs need investigation by a gastroenterologist. For persistent symptoms without red flags, a GP or functional medicine doctor can start the assessment.
What tests are used in functional medicine for digestion?
Common tests include coeliac serology, faecal calprotectin, complete blood count, iron studies, and breath tests for SIBO. However, SIBO breath tests often give false results. IgG food tests are not recommended by ASCIA. A doctor will choose tests based on your history and symptoms, and explain the strength of evidence for each.