What Is Gut Dysbiosis? Let’s talk about it.
The Hidden Gut Imbalance Linked to Bloating, Food Intolerances, Leaky Gut, Skin Problems and Hormone Symptoms
Struggling to lose weight despite doing everything ‘right’?
"I eat well, but I'm still bloated."
"I've cut out half my diet and still don't feel right."
"Every test comes back normal, yet I know something isn't."
If any of these sound familiar, you're not alone.
One of the most overlooked drivers of digestive complaints and seemingly unrelated health symptoms is gut dysbiosis – an imbalance within the gut microbiome that can affect everything from digestion and immunity to hormones, skin health and blood sugar balance.
In clinic, I often see clients who have spent years chasing symptoms, having unsuccessful medical investigations, including cameras stuck in unmentionable places, yet still without ever exploring what may be happening within their gut microbiome.
The good news?
Once you understand what's happening beneath the surface, it becomes much easier to make informed decisions about diet, lifestyle and testing.
Let's dive in.
What Is Gut Dysbiosis?
Gut dysbiosis refers to an imbalance in the community of bacteria, fungi and other microorganisms that live within your digestive tract.
Your gut microbiome contains trillions of microbes that help regulate:
Digestion
Nutrient absorption
Immune function
Hormone metabolism
Inflammation
Blood sugar regulation
Brain and mood health
In a healthy gut, beneficial and opportunistic microbes exist in balance.
With gut dysbiosis, that balance becomes disrupted.
This may involve:
Reduced beneficial bacteria
Lower microbial diversity
Overgrowth of less desirable bacteria
Increased yeast activity
Altered production of beneficial compounds such as short-chain fatty acids
Think of your gut microbiome as a garden.
When the right plants are thriving, everything works beautifully.
When weeds begin taking over and diversity decreases, problems often follow.
What Causes Gut Dysbiosis?
There is rarely one single cause.
Instead, gut dysbiosis often develops over time through a combination of factors.
Antibiotics
While antibiotics can be essential, they don't distinguish between beneficial and harmful bacteria.
Research shows antibiotic use can significantly alter microbial diversity, sometimes for months afterwards.
Chronic Stress
Your gut and brain are in constant communication through the gut-brain axis.
Long-term stress can alter gut motility, digestive secretions and microbiome composition.
Ultra-Processed Foods
Diets high in refined sugars, emulsifiers, additives and ultra-processed foods have been associated with less favourable microbial patterns.
Low Fibre Intake
Beneficial bacteria rely on dietary fibre as fuel.
Without enough fibre, many important bacterial species struggle to flourish.
Poor Sleep
Emerging evidence suggests sleep deprivation may negatively impact microbial diversity and inflammatory pathways.
Excess Alcohol
Frequent alcohol consumption may alter gut barrier function and microbial balance.
Hormonal Changes
Perimenopause, menopause and hormonal fluctuations can all influence both the gut and vaginal microbiome.
Common Gut Dysbiosis Symptoms
One reason gut dysbiosis often goes undetected is because symptoms can show up almost anywhere in the body.
Digestive Symptoms
Bloating
Excess wind
Abdominal discomfort
Constipation
Diarrhoea
IBS-type symptoms
Reflux
Nausea
Food Intolerance Symptoms
Digestive reactions after eating
Increased sensitivity to certain foods
Unpredictable symptoms
Worsening tolerance over time
Energy and Brain Function
Fatigue
Brain fog
Poor concentration
Low motivation – read more on the gut brain axis here: Gut-Brain Axis: How Your Gut Affects Mood, Anxiety & Energy
When we talk about the microbiome, most people immediately think of the gut, but it's important to remember that microbes live throughout the body. We each have distinct microbiomes in areas including the skin, mouth, lungs and vaginal tract, all of which interact with our immune system and play important roles in overall health. This helps explain why microbial imbalances can sometimes show up as symptoms far beyond the digestive system.
Can Gut Dysbiosis Cause Bloating?
Absolutely.
Bloating is one of the most common symptoms associated with gut dysbiosis.
When certain microbes become overrepresented, fermentation patterns can change, leading to increased gas production and digestive discomfort.
Many clients tell me:
"I wake up with a flat stomach and look six months pregnant by evening."
While bloating isn't always caused by dysbiosis, it is certainly one of the most common patterns we investigate when symptoms are ongoing.
Gut Dysbiosis, Food Intolerances and Leaky Gut
This is where things get particularly interesting.
Many people assume that food is always the problem.
Often, food is simply exposing an underlying issue.
Research suggests gut dysbiosis may contribute to increased intestinal permeability, often referred to as "leaky gut".
When the gut barrier becomes compromised:
Larger food particles may cross the gut lining
The immune system may become more reactive
Food intolerances may become more noticeable
Inflammation may increase
This creates a cycle where gut dysfunction drives food reactions, which then further aggravate symptoms.
This is one reason I always encourage people to look beyond simply eliminating foods and ask:
Why am I reacting in the first place?
Read my blog on Leaky Gut to learn more: Could you have a ‘gut leak’ or ‘leaky gut’?
Gut Dysbiosis and Skin Problems
Your skin and gut are more connected than most people realise.
Researchers often refer to this relationship as the gut-skin axis.
Studies have identified associations between gut dysbiosis and conditions including:
Acne
Rosacea
Eczema
Psoriasis
An imbalanced microbiome may influence:
Systemic inflammation
Immune function
Skin barrier integrity
Nutrient absorption
If you've tried every cream, cleanser and skincare routine without success, your gut may be worth investigating.
Read more here: The Gut-Skin Axis: How your Diet and Digestive Health are Affecting your Skin
Gut Dysbiosis and Female Health
The gut microbiome doesn't just influence digestion.
It also plays a role in female health.
Beneficial bacteria help support:
Oestrogen metabolism
Vaginal microbiome balance
Immune function
Inflammatory regulation
Emerging research suggests microbial imbalances may contribute to:
Recurrent UTIs
Thrush
Bacterial vaginosis
Hormonal symptoms
Many women are surprised to learn that ongoing urinary or vaginal symptoms may have roots extending far beyond the urinary tract itself.
Read my blog: Recurrent UTIs: The Vaginal Microbiome Link You Need to Know
Gut Dysbiosis, Candida and Yeast Overgrowth
While the internet often oversimplifies Candida discussions, yeast overgrowth can sometimes play a role in gut dysbiosis.
Potential signs may include:
Bloating
Sugar cravings
Brain fog
Digestive discomfort
Recurrent thrush
Certain lifestyle factors may encourage yeast overgrowth, including:
Frequent antibiotic use
High sugar diets
Chronic stress
Poor blood sugar control
This doesn't mean everyone with bloating has Candida.
But it can be one piece of the puzzle for some individuals.
Gut Dysbiosis and Blood Sugar Balance
One of the most exciting areas of microbiome research is the relationship between gut bacteria and blood sugar regulation.
Research suggests certain microbial patterns may be associated with:
Insulin resistance
Increased appetite
Blood sugar instability
Metabolic dysfunction
Meanwhile, unstable blood sugar levels may further disrupt the microbiome.
This creates a two-way relationship that can become difficult to break without addressing both sides.
Can Gut Dysbiosis Be Reversed?
The microbiome is remarkably adaptable.
Positive changes can often begin within days of changing diet and lifestyle habits.
Some evidence-based strategies include:
Increase Plant Diversity
Aim for 30g of fibre per day and 30 or more different plant foods each week.
Greater diversity is associated with greater microbial diversity.
Prioritise Fibre
Focus on:
Vegetables
Fruit
Beans
Lentils
Nuts
Seeds
Oats
Include Fermented Foods
If tolerated:
Kefir
Live yoghurt
Sauerkraut
Kimchi
Kombucha
Support Sleep
Quality sleep helps regulate inflammation, immunity and microbial health.
Manage Stress
Even the perfect diet cannot fully compensate for chronic stress.
Balance Blood Sugar
Including protein, fibre and healthy fats which each meal and snack and avoid ‘naked carbs’ to help support both metabolic and microbial health.
Read more on blood sugar regulation here: How to Stop Energy Crashes After Eating | Blood Sugar
How Do You Test for Gut Dysbiosis?
Sometimes general dietary improvements are enough.
However, if symptoms are persistent, testing can provide valuable insights.
At FIT Nutrition & Testing Clinic, we offer:
Advanced Food Intolerance Assessment + Personalised Nutrition Consultation
Useful for identifying potential food triggers associated with:
Bloating
Fatigue
Digestive symptoms
Skin concerns
Headaches
Gut Microbiome Assessment: Gut Health & Dysbiosis Test + Personalised Nutrition and Gut Consultation
Provides detailed information on:
Beneficial bacteria
Opportunistic bacteria
Microbial diversity
Yeast markers
Gut inflammation
Digestive function
Rather than guessing, testing allows us to understand what's actually happening inside your gut and create a personalised plan accordingly.
The Bottom Line
Gut dysbiosis is increasingly recognised as a potential contributor to bloating, food intolerances, digestive discomfort, skin conditions, hormone symptoms, recurrent UTIs, yeast overgrowth and blood sugar imbalance.
If you're constantly reacting to foods, struggling with bloating or simply don't feel like yourself despite eating well, it may be time to stop guessing and start investigating.
Because sometimes the symptoms aren't the problem.
They're the clue. Your gut has a story to tell. Let's find out what it's trying to say.
References
Cryan JF et al. Physiological Reviews. 2019.
Valdes AM et al. BMJ. 2018.
Gilbert JA et al. Nature Medicine. 2018.
Marco ML et al. Nature Reviews Gastroenterology & Hepatology. 2021.
Zmora N et al. Nature Reviews Gastroenterology & Hepatology. 2019.
Byrd AL et al. Nature Reviews Microbiology. 2018.
De Vos WM et al. Nature Reviews Gastroenterology & Hepatology. 2022.
Muhleisen AL & Herbst-Kralovetz MM. Maturitas. 2016.
Frequently Asked Questions About Gut Dysbiosis
What is gut dysbiosis?
Gut dysbiosis is an imbalance within the gut microbiome where beneficial bacteria become depleted and less favourable bacteria or yeast may become more dominant.
What are the symptoms of gut dysbiosis?
Common symptoms include bloating, digestive discomfort, food intolerances, fatigue, brain fog, skin issues, recurrent UTIs, thrush and sugar cravings.
Can gut dysbiosis cause food intolerances?
Research suggests gut dysbiosis may contribute to immune activation and increased intestinal permeability, potentially making food reactions more likely.
Can gut dysbiosis cause bloating?
Yes. Bloating is one of the most common symptoms associated with gut dysbiosis and microbial imbalance.
Can gut dysbiosis affect hormones?
Yes. The gut microbiome plays an important role in hormone metabolism, particularly oestrogen regulation.
How do you test for gut dysbiosis?
Comprehensive gut microbiome testing can assess microbial diversity, beneficial bacteria, opportunistic microbes, digestive markers, inflammation and yeast activity.
Can gut dysbiosis be reversed?
In many cases, positive dietary and lifestyle changes can significantly improve microbial balance and support a healthier gut environment.
If anything in this article sounds familiar, your body may be trying to tell you something. The good news is, you don't have to figure it out alone.
Take the free Find Your FIT Quiz to discover which test or programme suits your symptoms, or book a free 15-minute Personalised FIT Health Review with Becki for a direct, no-obligation conversation about where to start.
About Becki Hawkins
Becki Hawkins, BSc (Hons), mBANT, CNHC, is the founder of FIT Nutrition & Testing Clinic and a Registered Nutritional Therapist with over 20 years of experience. She specialises in evidence-based personalised nutrition and functional testing, helping clients uncover the root causes of digestive issues, hormonal imbalances, and unexplained symptoms. Becki combines clinical expertise with culinary creativity, translating complex test results into practical, delicious nutrition plans that work in real life. Her approach is simple: test, don't guess. Because guessing doesn't heal. Knowing does.