Why Diversity on Your Plate = Diversity in Your Gut

Food sensitivities, reflux, bloating, fatigue, brain fog, mood changes and skin flare-ups are becoming the norm — not the exception. Many people are told to avoid foods, blame their genes, or accept that this is just how their body works.

But there’s a deeper truth:

Symptoms don’t come from food alone — they come from how your body and your gut respond to the world you live in.

This blog brings together gut science, genetics, environment and lived experience to show how real healing happens.

Your gut: the immune, metabolic and signalling super-organ

Your gut isn’t just where food is digested — it is a communication hub that integrates immunity, metabolism, hormones and brain signalling.

Inside a healthy gut you will find:

• A diverse microbiome of bacteria, viruses and fungi — not all “good”, but a wide range of microbes.
  
• A protective mucosal barrier that regulates what enters your bloodstream.
  
• A large immune network — representing around 70–80% of your immune system.
  
• A neural network, often called the “second brain”.
  
• Chemical signalling systems that influence inflammation, mood, appetite, stress responses and your ability to gain or lose weight.
  

Around 90% of the body’s serotonin is produced in the gut, with your microbiome playing a major role in how it is regulated — which is why digestion, mood, motivation, anxiety and sleep are so closely linked.

When the gut barrier breaks down: intestinal permeability

Damage to the gut lining — known as intestinal permeability — allows food particles and microbes to cross into the bloodstream, activating immune responses that can present as:

• Bloating, reflux and food reactions
  
• Fatigue and brain fog
  
• Skin conditions
  
• Mood disturbance
  
• Autoimmune flares
  

When the gut lining is damaged (often called “leaky gut”) or microbial diversity is lost, immune tolerance and the skin barrier break down — and the body begins reacting to foods, microbes and even its own tissues.

When the body speaks loudly — my own gut health journey

I haven’t just studied gut health — I’ve lived it.

Before being diagnosed with Graves’ disease, I experienced a long period where my body was clearly in trouble, but I didn’t yet have answers. I developed extreme food sensitivities. Some days were so severe that even water triggered dry retching. I was vomiting bile. I felt poisoned. It was frightening — especially not knowing why.

But, I did recover. However, years later, after my second child, I experienced another flare — this time I paid attention to my symptoms much earlier, went on medication but I developed psoriasis. I returned to whole foods, identified gluten as a trigger, and finally had to pull back on stress and work. Thankfully this time I chose to reduce my work load, whereas the first time I was forced to stop work all together. 

The common thread in both experiences was this:

My gut, immune system and overall health were shaped by how I was living, eating and caring for myself — not just by genetics or bad luck.

And yes, I do carry genetic susceptibilities. I have:

• HLA variants associated with increased susceptibility to gluten sensitivity and coeliac disease,
  
• a FUT2 variant linked with lower bifidobacteria and reduced microbial diversity,
  
• several variations in antioxidant and detoxification enzymes that influence how efficiently I manage my chemicals, toxins and oxidative stress.
  

But it wasn’t my genes that made me unwell — it was the interaction between those genes and my environment.

Stress, sleep deprivation, immune triggers, food quality and the cumulative load I was carrying were the real drivers.

It is never just one thing.

The inherited component: genes that influence gut health and food responses

Your genes don’t determine your destiny — but they do shape how your gut interacts with food, microbes and inflammation.

FUT2 — shaping your microbiome from the inside out

The FUT2 gene controls whether specialised sugar-protein complexes (called fucosylated glycans) are expressed on the gut lining.

These structures act as attachment points and fuel for beneficial bacteria such as Bifidobacterium.

People with FUT2 variants often have:

• Lower bifidobacteria levels
  
• Reduced microbial diversity
  
• Therefore greater vulnerability to dysbiosis, and gut-immune related disorders such as Inflammatory Bowel Disease (IBD). 

These individuals usually need greater gut support prebiotic fibre intake and plant diversity to maintain gut resilience.

HLA genes — immune-driven reactions to gluten

Certain HLA gene variants shape how the immune system recognises gluten. In susceptible individuals, gluten exposure can activate inflammatory pathways that damage the gut lining and drive intestinal permeability, autoimmune activation and coeliac disease.

MCM6 — lactose (milk sugar) tolerance

The MCM6 gene regulates production of lactase — the enzyme that breaks down lactose.

Those with the adult-non-persistence variant cannot digest lactose effectively, meaning milk sugar ferments in the gut, causing:

• Bloating
  
• Gas
  
• Diarrhoea
  
• Abdominal discomfort
  

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Genes, infections and environment: where health is shaped

Serious gut dysfunction often follows a trigger event — a viral infection, gut pathogen, intense stress or burnout — particularly when fibre intake is low and the microbiome is under-resourced.

A nourished gut tolerates these exposures. A depleted gut does not.

What you are exposed to daily shapes how your gut actually behaves:

• Low fibre and poor plant food diversity
  
• Ultra-processed foods and additives
  
• Refined sugar and high-gluten diets
  
• Pesticides, preservatives and chemicals
  
• Chronic stress, burnout and sleep deprivation
  

Rebuilding your gut from the inside out

Prebiotics — feeding your microbes

Prebiotics are specific plant fibres that feed beneficial bacteria. They are found in onions, garlic, leeks, asparagus, oats, legumes, bananas and resistant starch (cooked-and-cooled rice or potatoes).

Why do I feel worse when I start eating healthy?

This is one of the most common questions I hear.

When the gut is fragile, inflamed or imbalanced (dysbiosis), introducing fibre-rich foods can initially cause:

• Bloating
  
• Gas
  
• Abdominal discomfort
  
• Changes in bowel habits
  

This happens because pathogenic or imbalanced microbes ferment these fibres differently, producing excess gas and inflammatory by-products.

It does not mean that whole foods are harming you — it means your gut ecosystem is not yet equipped to handle them.

This is why some people feel worse before they feel better when they begin eating “healthy”.

Probiotics — introducing beneficial microbes

Probiotics are beneficial bacteria that can be introduced through fermented foods and supplements.

Fermented foods include yoghurt, kefir, sauerkraut, kimchi, kombucha, miso and tempeh.

These foods are naturally high in histamine. If they trigger headaches, flushing, rashes or digestive upset, they should be avoided temporarily while the gut lining heals.

Postbiotics — where healing happens

Postbiotics are compounds your microbes produce when fermenting fibre — especially short-chain fatty acids like butyrate, which directly support gut lining integrity and immune balance.

Phytonutrients & polyphenols — a gentle first step

Berries, cacao, herbs, spices, olive oil and green tea increase beneficial bacteria and suppress pathogens.

For people who react to fibre or fermented foods, polyphenols are often the safest place to start — gently shifting the microbiome before adding prebiotics and probiotics.

Should I remove gluten and dairy?

The Whole Food Challenge began as part of my autoimmune recovery protocol.

We trial removing gluten and dairy — not because they are bad foods, but because they are common immune and gut triggers.

Some reintroduce them easily (generally these people do not have the genetic susceptibility to react to these foods) . Others discover they are key drivers of symptoms.

This process is about listening and understanding your body — not following rules.

Whole foods rebuild trust with your body

Whole foods don’t just nourish — they deliver information to your gut, your microbes and your genes.

Not as a trend.
Not as a rigid rule.
But as a way to restore communication between your gut and your body — and support healing from the inside out.

Your body isn’t broken.
It’s communicating.

If you need extra support

Changing how you eat is not always easy — especially when your gut is already reactive.

The Whole Food Challenge was originally part of my thyroid autoimmune recovery program and is now offered as a standalone way to gently rebuild your relationship with food.

In the fourth week, we focus specifically on:

• Nourishing the gut lining
  
• Increasing microbial diversity
  
• Supporting immune balance
  
• Reconnecting with your body
  

If the Challenge is currently open, you can find details here:

If it’s not running, this link will take you to the waitlist for the next round.