The Gut-Brain Axis: Could Your Gut Be Affecting How You Feel?
Have you ever felt “butterflies” in your stomach before an important event?
Lost your appetite when you were stressed?
Or noticed that your digestion goes haywire when life feels particularly overwhelming?
These experiences aren't a coincidence. Your gut and your brain are in constant communication through something known as the gut-brain axis — a two-way communication network connecting your digestive system and nervous system. Increasingly, research is showing just how important this relationship may be for digestion, mood, stress, appetite and overall wellbeing.
Your gut and brain are constantly talking
We often think of the brain as being in charge and the gut simply as the place where we digest our food. But the relationship is much more complicated than that.
Your gut contains millions of nerve cells and is closely connected to your nervous system. Communication between the gut and brain happens through several pathways, including the nervous system, hormones, immune signalling and the trillions of microorganisms living within your digestive tract — collectively known as the gut microbiome.
One particularly important communication route is the vagus nerve, which carries information between the gut and brain. This communication goes in both directions: your brain can influence your gut which helps explain why stress can cause nausea, diarrhoea, constipation or abdominal discomfort. But your gut can also influence your brain. Signals from the gut and its microbiome can affect processes involved in mood, appetite, stress responses and nervous-system function.
So when we're talking about gut health, we're not simply talking about digestion. We're talking about a system that may have far-reaching effects throughout the body.
When the gut-brain connection isn't working well
The gut-brain axis is particularly interesting when we look at some of the health problems people commonly struggle with.
1. Bloating, IBS and digestive problems
If you've ever experienced persistent bloating, abdominal pain, constipation or diarrhoea, you'll know that digestion can have a huge impact on everyday life.
Conditions such as irritable bowel syndrome (IBS) are now understood as disorders of gut-brain interaction. We know that the brain can influence gut movement, sensitivity and pain perception, while signals coming from the gut can influence the brain. Stress can therefore change how the digestive system functions and can amplify the way gut sensations are experienced.
This is one reason why simply focusing on food isn't always enough when someone is struggling with digestive symptoms. The nervous system matters too.
2. Stress and anxiety
Stress can alter gut movement and sensitivity via the body's stress-response system which, of course, goes both ways and the gut can send signals back to the brain.
Research has found a strong relationship between gastrointestinal problems and psychological symptoms, although the relationship is complex and doesn't mean that one is always the cause of the other.
In other words, it isn't necessarily:
Stress → bad digestion
or
Bad digestion → stress
It can be a cycle:
Stress ↔ gut symptoms ↔ altered gut-brain signalling
Breaking that cycle may require attention to both sides.
3. Low mood and depression
The gut-brain relationship is also being studied in relation to depression and other mood disorders.
The gut microbiome interacts with the immune, nervous and endocrine systems, and researchers are investigating how changes in these systems may influence mood and emotional wellbeing. It's important not to oversimplify this. Depression is a complex condition with many contributing factors, and improving gut health isn't a replacement for appropriate medical or psychological support.
This highlights an important point: Mental wellbeing isn't completely separate from physical health.
4. Inflammatory bowel disease
The gut-brain relationship is also relevant to inflammatory bowel diseases such as Crohn's disease and ulcerative colitis.
Research suggests the relationship between psychological wellbeing and inflammatory bowel disease can work in both directions. For example, psychological symptoms may be associated with worse disease outcomes, while active intestinal inflammation may increase the likelihood of developing anxiety or depressive symptoms.
Again, this doesn't mean stress causes IBD. These are complex medical conditions involving genetics, the immune system, environment and other factors. But supporting psychological wellbeing alongside appropriate medical treatment may be an important part of the bigger picture.
5. Brain fog, concentration and mental energy
“Brain fog” isn't a medical diagnosis, but it's a very real experience that many people describe as difficulty concentrating, poor memory, mental fatigue or feeling unable to think clearly.
There is growing interest in how gut-brain signalling, inflammation, sleep, stress and nutrition may interact with cognitive function. This is an area where research is still developing, so it's worth being cautious about claims that particular foods or supplements can “cure” brain fog. If you're interested in this, I've found a fascinating article here.
So, how can you support your gut-brain axis?
The good news is that you don't need to completely overhaul your diet or buy a cupboard full of supplements. Some of the most useful strategies are surprisingly simple.
1. Feed your gut microbes
Your gut bacteria thrive on a diverse range of plant foods.
Vegetables
Fruit
Beans and lentils
Wholegrains
Nuts and seeds
Herbs and spices
Different plants provide different types of fibre and plant compounds, helping support a diverse microbiome. Rather than becoming obsessed with eating the “perfect” diet, aim for variety. A simple goal is to gradually increase the number of different plant foods you eat across the week.
2. Don't forget prebiotic foods
Prebiotics are types of dietary fibre that can be used by beneficial gut microorganisms. Examples include foods such as onions, garlic, leeks, asparagus, oats, beans, lentils and some slightly less-ripe bananas.
If you're not used to eating much fibre, increase it gradually and drink enough fluid. Suddenly adding large quantities of fibre can actually make bloating worse for some people. More isn't always better!
3. Include fermented foods if you tolerate them
Foods such as natural yoghurt, kefir, sauerkraut, kimchi and other fermented foods can introduce live microorganisms or fermentation-derived compounds into the diet. However, fermented foods aren't a magic solution and not everyone tolerates them well. Start small and see how your body responds.
4. Slow down when you eat
Your digestive system doesn't operate independently of your nervous system.
Eating while rushing, working, driving or scrolling through your phone can make it harder to pay attention to your meal and your body's signals.
Try creating a calmer eating environment.
Put your phone down.
Take a few breaths.
Chew your food thoroughly.
Notice the smell, taste and texture.
It's simply giving your body a chance to switch gears from doing and rushing to resting and digesting.
5. Manage your stress — not just your food
This is one of the biggest pieces of the gut-brain puzzle. If you're constantly operating in a high-stress state, changing your breakfast alone isn't going to address the whole picture.
Consider what genuinely helps your nervous system settle:
Walking outdoors
Breathing exercises
Yoga or stretching
Meditation
Time away from screens
Spending time with people you enjoy
Exercise
Getting enough sleep
Having boundaries around work
Making time for activities that you find enjoyable
There isn't one perfect stress-management technique. The best one is usually the one you will actually do!
6. Prioritise sleep
Poor sleep can influence appetite, stress regulation and overall wellbeing, while stress and digestive discomfort can make good-quality sleep harder to achieve.
So if you're working on your gut health, don't overlook your bedtime routine. Check out some ideas in my blog here, but to summarise, schedule a consistent sleep and wake time, exposure to natural daylight during the day, regular movement and reducing stimulating activities close to bedtime can all help support healthy sleep habits.
7. Move your body regularly
Regular physical activity can influence the gut microbiome, digestive function, mood and stress regulation. You don't need to spend hours in the gym, a simple walk, strength training, cycle, swim, pilates, or dance in the kitchen will get your body moving! Choose movement that you enjoy and can do consistently.
8. Be careful with restrictive diets
When people experience digestive symptoms, it's tempting to start cutting out food after food.
Gluten.
Dairy.
Sugar.
Fruit.
Grains.
FODMAPs.
Before long, you can end up with a very restricted diet — and potentially a lot of anxiety around food.
Some dietary approaches can be useful for particular conditions and may be appropriate under professional guidance. But removing large numbers of foods isn't automatically the answer to digestive problems. If symptoms are persistent, severe or affecting your quality of life, it's important to speak to an appropriately qualified healthcare professional rather than trying to diagnose and treat the problem yourself.
Think beyond the gut
Digestion, stress, sleep, mood, nutrition, movement and brain health are interconnected.
That doesn't mean that improving your gut will magically solve every health problem.
It means that when you're trying to understand why you don't feel your best, it can be helpful to look at the bigger picture.
Switch your questioning from: “What one food or supplement can fix this?” to “What does my body need right now?”
Are you eating enough fibre and variety?
Are you moving regularly?
Are you sleeping well?
Are you constantly stressed?
Are you eating in a rush?
Are you giving yourself time to recover?
Are there digestive symptoms you've been ignoring?
Sometimes the most powerful changes aren't the complicated ones.
They're the small, consistent habits that support your body from multiple directions.
Your gut-brain reset: 5 simple things to try this week
If you want to start supporting your gut-brain connection, try this:
1. Eat 5 different plant foods each day - Build variety gradually rather than aiming for perfection.
2. Take a 10-minute walk after one meal - A simple way to add movement to your day.
3. Eat one meal without your phone - Slow down and actually pay attention to your food.
4. Create a 20-minute wind-down before bed - Give your brain and nervous system a chance to transition into sleep.
5. Do something every day that helps you switch off - A walk, breathing exercise, reading, stretching, music, time outside — whatever genuinely helps you feel calmer.
Small changes, repeated consistently, can be much more valuable than trying to change everything at once.
Ultimately
Your gut and brain are in constant conversation and research increasingly supports the importance of this gut-brain-microbiome connection in digestive health, stress, psychological wellbeing and conditions such as IBS and inflammatory bowel disease.
So perhaps it's time to stop thinking about gut health as simply “having good digestion.”
Your gut is part of a much bigger conversation happening throughout your body.
Support your brain and gut health with the basics:
Eat well.
Feed your gut microbes.
Move your body.
Sleep.
Manage stress.
Slow down.
Pay attention to what your body is telling you.
In a world of quick fixes and wellness trends, good health starts with simple, sustainable habits. If you'd like support in building a healthier relationship with food and discovering what truly works for your body, I'd love to work with you."
Check out my private programmes here, or book a free exploratory chat to find out more.
Disclaimer: The information in this article is for general education and isn't intended to diagnose, treat or replace medical advice for any health condition. If you have persistent digestive symptoms, unexplained weight loss, blood in your stool, significant pain or other concerning symptoms, speak to your GP or an appropriately qualified healthcare professional.
Comments