Why Am I So Bloated? A Naturopath Explains the Real Reasons
Most people who come to see me about bloating have already tried something. They have cut out gluten, taken a probiotic from the health food store, or followed a low FODMAP diet for six weeks. Some of those things helped a little. None of them fixed it.
That is usually because bloating is not a single problem with a single solution. It is a symptom, and the cause sitting underneath it matters enormously when it comes to treatment.
But bloating is one of the most clinically informative symptoms I see. It opens a window into the whole picture, not just what you are eating, but how you are eating it, whether that is standing up, at your desk, or on the run, how well your digestion is actually functioning, what your stress is doing in the background, and how your hormones are sitting. All of those things shape what happens in your gut after every single meal. And it is exactly why cutting out more and more foods rarely solves it for good.
In nine years of clinical practice, the most common drivers I see are low stomach acid, an imbalanced gut microbiome, bacterial overgrowth in the small intestine, food sensitivities, hormonal shifts, and a gut that is stuck in a stress response. Each one of those produces a similar outcome on the surface, but the way you address each one is quite different.
Here is how to start telling them apart.
Low Stomach Acid
This one surprises a lot of people. We tend to assume that digestive discomfort means too much acid, so we reach for antacids or try to cut out acidic foods. But in many cases, the opposite is true.
When stomach acid is too low, food sits in your stomach longer than it should. It starts to ferment rather than digest properly. Gas builds up, and bloating follows. Low stomach acid can also allow bacteria to travel further up the digestive tract than they should, which creates its own set of problems further down the line.
If you find you bloat very soon after eating, notice a lot of belching, or feel uncomfortably full after even a small meal, this could be part of what is happening for you.
I have written more about this in my post on low stomach acid and acid reflux. If this section resonated, that is a good next read.
An Imbalanced Gut Microbiome
Your gut is home to trillions of bacteria, and the balance of those bacteria matters enormously for how you feel day to day. When the wrong bacteria are overgrowing, or when the beneficial species are depleted, gas production increases significantly. Certain bacteria ferment carbohydrates and produce hydrogen and methane gas as a byproduct. That gas has to go somewhere, and where it often ends up is making your belly feel tight, distended, and uncomfortable by the afternoon.
This is called dysbiosis, and the tricky thing is that you cannot know exactly what is happening in your microbiome without testing. Symptoms alone point us in a direction, but a comprehensive gut microbiome test, like a Microba Insight or a GI-MAP stool test, gives us the full picture of what is actually living in your gut, what is missing, and what needs to shift.
SIBO: Small Intestinal Bacterial Overgrowth
SIBO is a condition where bacteria that should be living in the large intestine migrate upward into the small intestine, where they do not belong. When those bacteria encounter your food much earlier in the digestive process, they start fermenting it straight away.
The result is often significant bloating, sometimes within 30 to 90 minutes of eating. You might also notice cramping, unpredictable bowel habits, and that distended belly feeling that builds across the day and is at its worst by evening.
SIBO is very frequently missed. Many people who have been told they have IBS actually have undiagnosed bacterial overgrowth sitting underneath it. If your bloating is severe, fast-onset, or has not responded to dietary changes, this is absolutely worth investigating.
Food Sensitivities and Intolerances
A food sensitivity is different from a food allergy. The reaction is delayed, often appearing hours or even a day or two after eating the trigger food, which makes it genuinely difficult to identify without proper guidance.
Common drivers include gluten, dairy, eggs, and certain fermentable carbohydrates known as FODMAPs, foods like onion, garlic, legumes, apples, and wheat. When someone struggles to process these foods, they ferment in the large intestine and produce a significant amount of gas.
The problem with elimination diets is not that they do not work in the short term. It is that they do not address the underlying reason you are reacting to those foods in the first place. We use them as a short-term tool while we work on what is actually driving the sensitivity. You can read more about how food intolerances work in my post on food intolerances and what happens inside your body.
Stress, How You Are Eating, and the Gut-Brain Connection
Your gut and your brain are in constant communication. When you are stressed, rushed, or eating on the run, your digestive system registers that and responds accordingly.
Digestion is a rest-and-digest function. When you are eating at your desk, standing at the kitchen bench, or squeezing lunch into a 10-minute window between tasks, your body is not prioritising digestion. Stomach acid production drops, gut motility changes, and food moves through the system differently than it would if you were sitting down, relaxed, and actually present for the meal.
Over time, chronic stress also changes the composition of your gut microbiome, increases intestinal permeability, and makes food reactions more likely. Clients frequently mention that they eat well and still feel bloated, and this is often a significant part of why.
Hormones and Your Cycle
Bloating is not always a gut problem in isolation. Oestrogen and progesterone both influence how the gut moves and how it responds to food, which is why many women notice their bloating shifts across their menstrual cycle. In the days before a period, when progesterone drops, gut motility slows and bloating tends to worsen. During perimenopause, as oestrogen becomes more erratic, the gut microbiome shifts as well, and digestive symptoms that were never an issue before can start to appear.
The gut microbiome also plays a direct role in how the body processes and clears oestrogen, which means the relationship between hormones and gut health runs in both directions. If your bloating is cyclical or has changed alongside other hormonal shifts, that pattern tells us a great deal about where to start.
You can read more about the connection between hormones and gut health on my conditions treated page.
Constipation
If things are not moving through your bowel regularly and efficiently, bloating is almost inevitable. Stool that sits in the large intestine continues to be fermented by bacteria, gas accumulates, and pressure builds. Constipation itself has many different causes, from low fibre and dehydration to dysbiosis, thyroid dysfunction, and hormonal imbalances, which is why treating it properly means understanding why it is happening rather than reaching for a laxative.
What Actually Helps
The simple things you can layer in now
A few shifts that support better digestion day to day, regardless of the underlying cause, include sitting down to eat without a screen or a to-do list in front of you, chewing thoroughly, having coffee after food rather than on an empty stomach, and including bitter foods like rocket, lemon juice, or a small amount of apple cider vinegar before meals to support stomach acid production. Building a wide variety of plant foods into your diet over time also feeds the beneficial bacteria your microbiome depends on.
These are not the whole answer, but they create better conditions for everything else to work.
Test, do not guess
This is where clients tend to waste the most time before they find their way to me. A probiotic a friend recommended, gluten cut out for two weeks, a digestive enzyme that helped for a month. Incremental improvements that never quite resolve the problem. Without understanding what is actually happening in your gut, treatment will always be incomplete.
At my Spotswood clinic I use comprehensive functional testing to take the guesswork out of it. A gut microbiome test shows us which bacteria are present, which are missing, markers of inflammation and intestinal permeability, digestive enzyme function, and whether any pathogens are contributing to the picture. From there we can build a plan that is targeted to what your body actually needs rather than what worked for someone else.
Address the whole picture
Bloating rarely has a single cause. The most effective treatment addresses all of the contributing factors together, in the right order. That might mean supporting stomach acid, clearing a bacterial overgrowth, reintroducing beneficial species, supporting the nervous system, and making some nutritional shifts, all as part of a phased protocol built around your specific results and history.
That is the work we do together in a consultation, and it looks quite different from trying to piece it together alone.
Working Together
If you have been bloated for months or years, have tried elimination diets that only got you so far, or have been told it is just IBS without anyone really looking into why, we can work together to get a much clearer picture.
I see clients in person at my clinic in Spotswood, Melbourne, and via telehealth for those across Australia.
Or if you would like to learn more first, you can explore what conditions I work with, find out more about functional testing and what it involves, or learn more about me and how I work.
Kylie Sartori is a degree-qualified naturopath based in Spotswood, Melbourne, specialising in gut health, microbiome restoration, hormonal health, and family wellbeing. She offers in-person consultations at her Spotswood clinic and telehealth appointments for clients across Australia.
Book an appointment | Learn more about Kylie | Conditions treated | Functional testing
