Gut Health and Mental Health: Understanding the Gut-Brain Connection
Have you ever felt nervous and suddenly needed to run to the bathroom? Lost your appetite when you’re stressed? Or noticed that your stomach seems to know you’re anxious before your brain has quite caught up?
That’s not just in your head.
Your brain and digestive system are constantly communicating with each other through what’s known as the gut-brain axis.
It’s one of the reasons gut health and mental health are increasingly being discussed together — and why supporting one can sometimes form part of supporting the other.
But before you start buying “gut healing” powders from Instagram, let’s look at what the gut-brain connection actually means.
What is the gut-brain axis?
The gut-brain axis describes the two-way communication system between your gastrointestinal tract and your brain.
Your gut and brain communicate through several pathways involving the nervous system, hormones, immune system and the microorganisms living within your digestive tract — collectively known as the gut microbiome.
And importantly, this communication goes both ways.
Your digestive health may influence how you feel, while your emotional state can also influence how your digestive system behaves.
That’s why stress can sometimes show up physically as:
Bloating
Abdominal discomfort
Nausea
Diarrhoea
Constipation
Changes in appetite
Feeling like you suddenly need to use the bathroom
For some people, stressful periods can significantly worsen existing gastrointestinal symptoms.
Why does anxiety affect your stomach?
When we’re anxious or stressed, our nervous system responds to what it perceives as a threat.
You’ve probably heard of the fight-or-flight response.
When this system activates, the body prioritises dealing with the perceived threat rather than calmly digesting lunch. This can change digestive activity and contribute to uncomfortable gastrointestinal symptoms.
This doesn’t mean digestive symptoms are “just anxiety.”
Conditions such as IBS, IBD, Coeliac disease, food intolerances and other gastrointestinal concerns deserve appropriate assessment and management.
But it does mean that stress and digestive health can interact with each other.
Someone might experience gut symptoms, become anxious about those symptoms, and then find that the increased anxiety makes their digestive symptoms even more noticeable.
It can become a frustrating cycle.
IBS and mental health
Irritable Bowel Syndrome (IBS) is a common gastrointestinal condition involving symptoms such as abdominal pain, bloating and changes in bowel habits.
For some people with IBS, stress and anxiety can be significant triggers.
And living with unpredictable digestive symptoms can itself become stressful.
You might start worrying about where the nearest bathroom is, avoiding certain foods, declining social events or feeling anxious about eating away from home.
Over time, food can start to feel like something you need to control rather than enjoy.
This is one area where dietetics and psychological support can work particularly well alongside each other.
A dietitian can help identify dietary triggers and ensure you’re meeting your nutritional needs, while psychological support can help with stress, anxiety and the emotional impact of living with ongoing symptoms.
What role does the gut microbiome play?
Your gut contains trillions of microorganisms, including different types of bacteria.
Collectively, these microorganisms make up your gut microbiome.
Researchers are increasingly interested in how the microbiome may interact with the immune system, metabolism, nervous system and brain.
You’ve probably also seen some pretty big claims online about “fixing your microbiome” to cure everything from anxiety to fatigue.
The reality is more nuanced.
The gut microbiome is an exciting and rapidly developing area of research, but we still have a lot to learn. There isn’t currently one perfect microbiome or one magical combination of foods and supplements that everyone needs.
That’s why individualised, evidence-based nutrition advice matters.
Do you need probiotics for good gut health?
Not necessarily.
Probiotics can be useful in particular situations, but taking a random probiotic because the packaging says “gut health” doesn’t automatically mean it’s going to help your symptoms.
Different probiotic strains can have different effects, and whether one is appropriate depends on the individual and what you’re trying to manage.
The same goes for the growing number of powders, supplements, detoxes and “gut reset” programs available online.
More isn’t always better.
Sometimes the most useful place to start is much less exciting: understanding your symptoms, eating adequately, increasing dietary variety where appropriate and identifying whether particular foods are genuinely contributing to symptoms.
Should you cut foods out if your stomach is sensitive?
This is another area where getting professional guidance can make a big difference.
When someone regularly experiences bloating, pain or unpredictable bowel movements, it’s understandable to start blaming food.
One food gets removed. Then another. Then dairy. Then gluten. Then half the supermarket.
Before long, your diet can become unnecessarily restrictive — and you still might not know what’s actually causing the problem.
Elimination approaches such as a low-FODMAP diet can be useful for some people with IBS, but they’re generally intended to be used strategically rather than becoming a permanent restrictive diet.
Working with a dietitian can help you investigate symptoms while maintaining as much variety and nutritional adequacy as possible.
How can you support your gut health?
There isn’t one perfect “gut health diet.”
For many people, supporting gut health involves looking at their overall eating pattern rather than chasing individual superfoods.
Depending on your individual needs, this might involve:
Eating a varied range of foods
Including fibre-rich foods where tolerated
Eating enough throughout the day
Drinking adequate fluids
Including fruits, vegetables, wholegrains and legumes
Gradually increasing dietary variety
Identifying genuine food triggers rather than unnecessarily restricting foods
And importantly, what’s considered helpful for one person’s gut may be completely inappropriate for another.
Someone managing IBD, Coeliac disease, IBS or food allergies may need very different nutrition support from someone simply wanting to improve their general gut health.
When should you see a dietitian about gut health?
It may be worth speaking with a dietitian if you’re experiencing ongoing digestive symptoms or finding that food is becoming increasingly confusing or restrictive.
This could include:
Frequent bloating
Abdominal pain or discomfort
Diarrhoea or constipation
IBS
IBD
Coeliac disease
Food allergies or intolerances
Difficulty identifying food triggers
An increasingly restricted diet
Anxiety or uncertainty around what you can eat
Persistent or concerning gastrointestinal symptoms should also be discussed with your GP so appropriate medical investigation can occur.
Gut Health Dietitian on the Sunshine Coast
At My Wellness Mindset, our Accredited Practising Dietitian, Ingrid, has a particular interest in gastroenterology and gut health.
She supports clients with concerns including IBS, IBD, Coeliac disease, food allergies and intolerances, Eosinophilic Oesophagitis (EoE), metabolic liver conditions and stomal care, alongside general nutrition and women’s and family health.
Having dietetics available alongside psychology and counselling also means we can take a more connected approach when stress, anxiety, eating patterns and digestive symptoms are overlapping.
Initial Dietetics Consultation: $189
Ongoing Dietetics Consultation: $89.50
Medicare rebates may be available for eligible clients with a GP referral under a Chronic Condition Management Plan. Private health rebates may also be available depending on your provider and level of cover.
If your gut has been running the show lately, you don’t have to keep trying to figure it out through Google, food restriction and guesswork.
Book an appointment with Ingrid at My Wellness Mindset in Caloundra and get personalised, evidence-based support for your gut health.
