Table of Contents
- Introduction
- Understanding the Gut Microbiome
- The Blue Horizon Method: Step One – Consult Your GP
- Step Two: The Structured Self-Check
- How to Increase the Good Gut Bacteria Through Diet
- Factors That Can Harm Your Gut Bacteria
- The Connection Between Gut Health and the Thyroid
- Step Three: Targeted Testing with Blue Horizon
- Moving Forward: A Calm, Practical Journey
- FAQ
Introduction
Have you ever experienced that persistent, heavy feeling of bloating after a meal, or a bout of "brain fog" that makes a simple workday feel like trekking through treacle? Perhaps you’ve noticed your energy levels dipping unexpectedly, or your skin flaring up despite a consistent routine. For many people in the UK, these "mystery symptoms" are a daily reality. While we often look at these issues in isolation, the root cause frequently resides in a complex, bustling ecosystem known as the gut microbiome.
The gut microbiome is a collection of trillions of microorganisms—including bacteria, viruses, and fungi—living in your digestive tract. Far from being "germs" to be avoided, these microbes are essential partners in your health. They help digest your food, produce vital vitamins, train your immune system, and even influence your mood. When we talk about how to increase the good gut bacteria, we are really talking about "cultivating" a garden. Like any garden, your gut requires the right soil, the right seeds, and consistent care to thrive.
In this article, we will explore the science of the gut microbiome and provide practical, evidence-based steps to help you support your beneficial bacteria. We will cover the role of prebiotics and probiotics, the impact of lifestyle factors like stress and sleep, and how your gut health interacts with other systems, such as your thyroid. If you want a closer look at the gut-focused testing we offer, our Gut Health collection is a useful place to start.
At Blue Horizon, we believe that health is a journey, not a quick fix. Our approach—the Blue Horizon Method—is built on a phased, clinically responsible path. This starts with consulting your GP to rule out underlying conditions, moves through structured lifestyle tracking, and finally considers targeted blood testing if you need a clearer "snapshot" of your health to guide your next steps.
Understanding the Gut Microbiome
To understand how to increase the good gut bacteria, we first need to understand what they are and why they matter. The majority of these microbes live in your large intestine (the colon). In a healthy gut, there is a high degree of "diversity," meaning many different species of bacteria are present.
Scientists often categorise these bacteria into "good" (commensal or beneficial) and "bad" (pathogenic) groups. However, it is more about balance than a simple binary. Beneficial bacteria, such as Lactobacillus and Bifidobacterium, produce substances called short-chain fatty acids (SCFAs). These SCFAs, like butyrate, provide energy for the cells lining your gut, reduce inflammation, and may even play a role in preventing chronic diseases. For a broader explainer on why this ecosystem matters, see our guide on how important the gut microbiome is for your health.
When the balance is thrown off—a state known as dysbiosis—the "bad" bacteria or yeasts can overgrow. This can lead to the classic symptoms of digestive distress: gas, diarrhoea, constipation, and bloating. However, because the gut is so intrinsically linked to the rest of the body via the "gut-brain axis" and the immune system, dysbiosis can also manifest as fatigue, irritability, and even a weakened immune response to common seasonal bugs.
The Blue Horizon Method: Step One – Consult Your GP
Before you begin any new health regime or significantly alter your diet to target gut bacteria, the most responsible first step is to consult your GP. It is essential to rule out clinical conditions that may mimic general "gut health" issues.
Persistent changes in bowel habits, unexplained weight loss, or abdominal pain should always be investigated by a medical professional. Your GP can perform standard NHS screenings to rule out conditions such as Celiac disease, Inflammatory Bowel Disease (IBD), or more serious gastrointestinal concerns.
Safety Note: If you experience sudden or severe symptoms, such as intense abdominal pain, blood in your stool, high fever, or difficulty breathing, please seek urgent medical attention by calling 999 or visiting your nearest A&E department.
Once your GP has confirmed that there are no acute medical issues, you can then begin to look at "optimising" your gut health through lifestyle and dietary changes.
Step Two: The Structured Self-Check
Before jumping into supplements or complex dietary protocols, we recommend a period of structured observation. This helps you identify patterns that may be contributing to your symptoms. If you’re unsure what the testing journey looks like, our guide on how to fix your gut bacteria for better health walks through the phased approach.
Keep a Food and Symptom Diary
For at least two weeks, track what you eat and when your symptoms occur. Do you feel bloated specifically after eating certain grains? Does your "brain fog" worsen after a high-sugar snack? Note down your energy levels, your mood, and your bowel movements (using the Bristol Stool Chart can be a helpful way to provide objective data to your GP later).
Monitor Lifestyle Factors
Gut bacteria are highly sensitive to your environment. In your diary, also track:
- Sleep: Are you getting 7–9 hours of quality rest? Lack of sleep can alter the composition of gut flora.
- Stress: High levels of cortisol (the stress hormone) can "leak" through the gut lining and disrupt bacterial balance.
- Movement: Moderate exercise has been shown to increase the diversity of beneficial microbes.
How to Increase the Good Gut Bacteria Through Diet
Diet is the most powerful tool we have for shaping the microbiome. The bacteria in your gut eat what you eat. If you provide them with the right fuel, the "good" strains will flourish and naturally crowd out the less desirable ones.
The Power of Prebiotics: Feeding the Fleet
Think of prebiotics as "fertility treatment" for your good bacteria. Prebiotics are types of fibre that humans cannot digest, but our gut bacteria love. When bacteria ferment these fibres, they produce the beneficial SCFAs mentioned earlier.
Excellent sources of prebiotic fibre include:
- Garlic and Onions: These contain inulin, a favourite food for Bifidobacteria.
- Leeks and Asparagus: High in fibre that supports gut lining health.
- Slightly Under-ripe Bananas: These contain resistant starch, which travels all the way to the colon to feed your microbes.
- Legumes: Lentils, chickpeas, and beans are fantastic "slow-burn" fuels for the gut.
Probiotics: Inviting New Guests
While prebiotics feed the bacteria you already have, probiotics are live beneficial bacteria found in certain foods that can help bolster your internal population.
To increase your intake of probiotics, consider incorporating traditional fermented foods:
- Live Yogurt: Ensure it says "live and active cultures" on the label.
- Kefir: A fermented milk drink (or water-based alternative) that often contains a wider variety of bacterial strains than yogurt.
- Sauerkraut and Kimchi: Fermented cabbage dishes that provide a "crunchy" hit of beneficial bacteria.
- Miso: A fermented soybean paste that adds "umami" flavour and gut-friendly microbes to soups and dressings.
- Kombucha: A fermented tea that can be a refreshing alternative to sugary soft drinks.
Eating the Rainbow: Polyphenols
Polyphenols are plant compounds found in brightly coloured fruits and vegetables, as well as in green tea, cocoa, and olive oil. Most polyphenols aren’t absorbed in the small intestine; instead, they make it down to the colon, where gut bacteria break them down. This process promotes the growth of beneficial species and can help lower inflammation. Aim for a "rainbow" on your plate—blueberries, red cabbage, spinach, and orange carrots all provide different types of "microbe food."
Factors That Can Harm Your Gut Bacteria
Increasing the good bacteria is only half the battle; you must also protect the ones you have. Several common aspects of modern life can act as "weedkillers" in your internal garden.
Overuse of Antibiotics
While antibiotics are life-saving medications that should always be taken when prescribed by a GP, they are not "smart" bombs. They kill both the harmful bacteria causing an infection and the beneficial bacteria in your gut. If you have recently completed a course of antibiotics, focusing on the prebiotic and probiotic strategies above is crucial for helping your microbiome recover.
Ultra-Processed Foods and Added Sugars
Diets high in refined sugars and artificial additives can encourage the growth of "bad" bacteria and yeasts, such as Candida. These microbes often thrive on simple sugars, and an overgrowth can lead to further cravings, creating a vicious cycle. Try to swap processed snacks for whole-food alternatives like nuts, seeds, or fresh fruit.
Alcohol
Excessive alcohol consumption can irritate the gut lining and lead to an imbalance in gut flora. Moderation is key to maintaining a resilient microbiome.
The Connection Between Gut Health and the Thyroid
At Blue Horizon, we often see patients who are concerned about "mystery fatigue" or weight changes that haven't been resolved by standard checks. In many cases, there is a fascinating link between the gut and the thyroid gland.
The thyroid produces hormones (primarily T4) that regulate your metabolism. However, T4 is largely inactive. For your body to use it, it must be converted into the active form, T3. A significant portion of this conversion (around 20%) happens in the gut, facilitated by an enzyme produced by healthy gut bacteria.
If your gut microbiome is out of balance, this conversion may be less efficient. This is why some people might have "normal" TSH (Thyroid Stimulating Hormone) levels on a standard NHS test but still feel the symptoms of an underactive thyroid, such as lethargy or feeling cold.
Step Three: Targeted Testing with Blue Horizon
If you have consulted your GP, tracked your lifestyle, and improved your diet but still feel "stuck," a private blood test can provide a more detailed "snapshot" to help you and your healthcare professional see the bigger picture. Our thyroid blood tests collection is designed for people who want a structured way to investigate thyroid-related symptoms.
Our thyroid testing range is particularly relevant here because we include "Blue Horizon Extras"—markers that many other providers overlook but which are deeply connected to gut and metabolic health.
Why Our Tests Are Different
Most standard thyroid checks only look at TSH and perhaps Free T4. At Blue Horizon, we believe in a more comprehensive view.
- Magnesium: Included in all our thyroid tiers. Magnesium is a vital cofactor for hundreds of enzymes. It is also essential for gut motility (keeping things moving) and is often depleted by stress or poor absorption in the gut.
- Cortisol: Also included in our base tiers. Since the "gut-brain axis" means stress directly impacts your bacteria, knowing your morning cortisol level can help you understand if "adrenal fatigue" or chronic stress is a factor in your gut issues.
Choosing the Right Tier
We offer four clear tiers to help you find the right level of detail:
- Bronze: A focused starting point. It includes the base thyroid markers (TSH, Free T4, Free T3) plus our Blue Horizon Extras (Magnesium and Cortisol). This is ideal for those wanting to see if their "active" T3 levels are being affected.
- Silver: Everything in Bronze, plus thyroid antibodies (TPOAb and TgAb). This helps rule out autoimmune involvement, which often goes hand-in-hand with gut permeability issues.
- Gold: Everything in Silver, plus a broader health snapshot including Vitamin D, B12, Folate, Ferritin, and CRP (a marker of inflammation). Since the gut is responsible for absorbing these vitamins, low levels can often point back to gut health issues. If you want the detailed panel, see the Thyroid Premium Gold test.
- Platinum: Our most comprehensive metabolic profile. It includes everything in Gold plus Reverse T3, HbA1c (for blood sugar), and a full iron panel. This is for those who want the most complete picture possible of their metabolic and thyroid health. You can explore the Thyroid Premium Platinum test for the full profile.
Sample Collection and Timing
For all thyroid-related tests, we recommend a 9am sample. This ensures consistency, as hormone levels naturally fluctuate throughout the day.
- Bronze, Silver, and Gold: These can be collected via a simple home fingerprick kit, a Tasso device, or by visiting a professional clinic.
- Platinum: Because this test is so comprehensive, it requires a larger volume of blood and must be collected via a professional venous blood draw at a clinic or via a nurse home visit.
You can view current pricing and more details on the relevant product pages.
Moving Forward: A Calm, Practical Journey
Increasing your good gut bacteria is not something that happens overnight. It is a process of consistent, small changes that add up to a significant shift in your internal environment.
Key Takeaway: Treat your gut like a garden. Pull the "weeds" (reduce sugar and processed foods), plant the "seeds" (eat probiotic fermented foods), and provide the "fertiliser" (eat plenty of prebiotic fibre).
By following the Blue Horizon Method—starting with your GP, tracking your unique patterns, and using targeted testing only when needed—you move away from guesswork and towards a more informed, productive conversation about your health. If you’d like more ideas for practical next steps, our article on how to get good gut bacteria back for long-term health is a helpful companion read.
Whether you are struggling with bloating, fatigue, or simply want to optimise your long-term wellbeing, supporting your gut bacteria is one of the most impactful steps you can take. Be patient with your body, stay curious about your symptoms, and remember that we are here to provide the structured data you need to find your way back to balance.
FAQ
Can I increase my gut bacteria just by taking a supplement?
While probiotic supplements can be helpful, especially after antibiotics, they are not a "magic pill." Supplements usually contain only a few specific strains of bacteria. To truly increase diversity and health, you must provide the right "soil" and "fuel" through a varied diet rich in fibre and whole foods. Supplements should complement, not replace, a healthy lifestyle. If you want a broader overview of what supports the microbiome, our guide on how to improve the gut microbiome for better vitality is worth a look.
How long does it take to see changes in gut health?
Your microbiome is remarkably dynamic. Studies have shown that gut bacteria can begin to shift within just 24 to 48 hours of a major dietary change. however, for these changes to translate into fewer symptoms like less bloating or better energy, it usually takes 2 to 4 weeks of consistent habits. Long-term "restoration" of a severely imbalanced gut can take several months.
Why does Blue Horizon include Magnesium in thyroid tests?
Magnesium is one of our "Blue Horizon Extras" because it is a crucial "spark plug" for the body. It helps convert thyroid hormones, supports the nervous system, and helps the muscles in your digestive tract relax and contract properly. Many people with gut issues have low magnesium levels due to poor absorption, so including it provides a much more useful health "snapshot." For a deeper explanation, read our article on why magnesium is good for thyroid health.
Should I change my diet if I have "normal" blood test results?
"Normal" results from a GP mean you do not have a diagnosed disease, which is good news. However, you can still have "sub-optimal" health. If you still feel unwell despite normal results, using a diary to track how different foods affect your symptoms is a great way to identify personal triggers. Small, healthy changes like increasing vegetable intake and reducing sugar are beneficial for almost everyone, regardless of test results. If you want to understand the testing approach in more depth, our guide to what tests are required for thyroid explains the broader picture.
Gut Health
Food Intolerance Test - now with 260 foods and drinks.
SIBO Breath Test
