If you’ve ever felt confused, overwhelmed, or just plain misled by gut health advice online, this guide is for you.
It covers everything from what gut health actually means, to the real reasons yours might be suffering, to the practical steps you can take to genuinely improve it, all backed by science, with no supplements to sell you at the end.
Here are all the topics we’re going to go through:
- What gut health actually means
- Signs that your gut might be struggling
- What causes poor gut health
- Practical ways to improve it
What Even Is Gut Health?
“Gut” is the common way of referring to your gastrointestinal tract, the system that runs all the way from your mouth to your bottom. Its primary job is to digest food, absorb nutrients, and eliminate waste.
There are over 4,500 different types of bacteria living within your gut, and that make up what’s known as your gut microbiome.
And if that makes your skin crawl, it may make you feel a little bit better that the bug community growing inside of you is completely unique to you.
Bacteria are generally seen as a bad thing when it comes to infections. But in the gut, bacteria isn’t the problem.
It’s the imbalance of good bacteria and bad bacteria. And a well evidenced indicator of good gut health is diversity of bacteria within your gut.
Signs You Have Bad Gut Health
Now this is where I start to have some very serious issues with the misinformation that we find on social media.
The symptoms I’m about to list are not just associated with bad gut health. They’re also associated with some really serious health conditions that should not be dismissed as something trendy like “bad gut health.”
Please, if you experience any of these symptoms, keep a diary. And if they continue to concern you, go and see a doctor.
1. Excessive bloating and gas
Bloating and gas are a natural part of human digestion.
However, excessive amounts can be due to an imbalance in your microbiome.
Or if it doesn’t go away, it could be something as serious as ovarian cancer, which is exactly why it’s so important to keep track of it, not dismiss it, and go and see your GP.
If you frequently experience discomfort, this post may help you understand the common causes of bloating and gas and how they relate to digestive health.
2. Food intolerances
Food intolerances can also be a sign of bad gut health.
However, this is not the same as food allergies. And if you have a food allergy that makes your throat close up, please do not listen to social media advice telling you that you can reverse your allergy through gut health. This is incredibly dangerous.
3. Skin concerns
Research suggests that gut bacteria may influence skin issues such as:
- eczema
- acne
- rosacea
This is often referred to as the gut–skin connection.
4. Autoimmune conditions
There is some research to suggest that whatever bacteria are living within your gut can reduce or increase your risk of certain autoimmune conditions.
5. Unintentional weight fluctuations
Your gut microbiome can influence metabolism and weight. However, unintentional fluctuations can also be caused by issues with your thyroid or cancer.
So we should not be automatically dismissing sudden unexplained weight changes as just poor gut health.
What Causes Bad Gut Health?
Diet plays a role, but it’s far from the only factor. Several lifestyle habits influence the balance of bacteria in your gut.
1. Diet high in processed foods
I know they’re delicious, but if you eat a lot of processed foods with a lot of salt, fats, or sugars added to them, these foods often not only lack the essential nutrients and fibers that are beneficial for good bacteria, but they may also promote the growth of the bad bacteria.
And it’s not just about what we shouldn’t be eating. It’s also about what we should be eating, and that is enough fiber.
Fiber is like rocket fuel for our good bacteria. When we don’t give it enough, it gives bad bacteria an environment where it can flourish and cause an imbalance.
And over time, this leads to:
- Inflammation
- Reduced nutrient absorption
- A weakened immune system
2. Stress
It is no coincidence that we have phrases like “butterflies in your tummy.” Our emotions have a direct impact on our digestion.
The brain definitely affects the gut, but there’s also evidence that suggests that the gut affects the brain right back.
Stress and depression can reshape our gut microbiome negatively through:
- Stress hormones like cortisol
- Inflammation
- Changes to our nervous system
And if that wasn’t enough, some gut bacteria imbalances may also increase the stress response and your risk of depression.
3. Antibiotics
To understand why antibiotics can have a bad effect on our gut microbiome, we need to understand a little bit more about how they work.
Broad-spectrum vs. narrow-spectrum antibiotics
| Broad-spectrum | Narrow-spectrum | |
|---|---|---|
| What it does | Kills the infection but also wipes out a lot of good bacteria | Targets only the bacteria causing the infection |
| When it’s used | Given immediately, no time to wait for lab results | Given after lab cultures identify the specific bacteria (takes days) |
So how do you know which one you’ve been given? Most of the time, doctors will start you on broad-spectrum antibiotics because identifying the exact bacteria requires lab cultures that take a couple of days.
And treating an infection quickly matters enormously. You don’t want to be waiting around while something progresses.
But this doesn’t mean antibiotics should be avoided when necessary. It simply means they should be used responsibly and only when prescribed.
It’s also worth knowing that other medications can alter your gut microbiome too.
So if you start a new medication and notice a change in your gut health, go and see your doctor and have a conversation with them. They may be able to offer some appropriate alternatives.
4. Lack of sleep
Research has shown that sleep and gut health are closely connected.
So not only does the bacteria within your gut affect the regulation of your sleep, but disturbances in your sleep may also imbalance the bacteria within your gut.
5. A sedentary lifestyle
I bet you are living your busiest, most productive life. And when you get home from your really taxing day, you just want to plonk yourself in front of a Netflix series, not go for a walk, not go to the gym, not move in any way. You just want to sit and be in your hovel. And I can relate to that.
But none of us can escape the science.
Not moving your body regularly can contribute to poor gut health.
Regular movement benefits gut health in several ways:
- increases microbial diversity
- improves digestion
- reduces inflammation
On the other hand, prolonged sitting can slow digestion and contribute to issues like constipation.
If constipation is a frequent issue, here are the causes and simple ways to relieve constipation to help support better gut health.
How to Fix Your Gut Health?
Some evidence has suggested that only days after you change your diet, your gut microbiome begins to alter.
Which is exciting, because it means you have the potential to quickly improve your gut microbiome. But it also means you can quite quickly backtrack on that improvement too.
This isn’t a quick fix.
So step away from the food intolerance tests. Step away from the apple cider vinegar. Step away from the colon cleanses.
Here are the practical, evidence-based steps to actually improve your gut health over the course of your life.
1. Eat fiber
Fiber feeds beneficial gut bacteria.
Good sources include:
- fruits
- vegetables
- legumes
- nuts
- seeds
- whole grains
Also note that fiber has the potential to feed the bad bacteria. So avoid eating too much of it.
2. Eat less processed food, but do it gradually
Big, drastic changes are not the way to build good long-term habits.
Foods with added salts, sugars, and fats are not good. There’s no getting around that.
However, they are part of 21st century life. They are everywhere we look. They are being shoved in our faces by intelligent marketing companies.
And completely cutting them out is very difficult, especially once you’ve had a sweet, sweet taste of smoked paprika Pringles.
So here are a couple of suggestions to reduce processed food whilst maintaining a good relationship with your body:
- If you currently eat two processed snacks a day, try cutting it down to one.
- If you’re obsessed with something like Reese’s Pieces, try making a homemade version during the week and having the real thing on weekends.
It’s not about being perfect. It’s about improving.
3. Eat a wide variety of fiber-rich foods
Eat as many different variations of fruits, vegetables, nuts, seeds, legumes, and whole grains as possible within your budget and time constraints.
I understand that sounds expensive, especially if you live alone and don’t want to buy a whole load of fresh produce just for it to go to waste because you’ve only had a mouthful of each. Which is where the next step comes in.
4. Build a diversity jar
Basically, you take the plant fibers that are great for gut bacteria but have a longer shelf life and a more neutral flavour, mainly things like seeds and nuts.
You mix them all together in a big jar, and then add one or two tablespoons to your porridge, pasta, desserts, or smoothies to easily inject diversity into almost every meal of your day.
And I get it, nuts and seeds are also quite expensive. But you don’t have to start all at once. Pick up one or two new varieties each week and build from there to spread the cost.
5. Probiotics and prebiotics
Probiotics
Probiotics are live bacteria marketed as being good for your gut.
They can come in food form or as supplements. I am not going to recommend probiotic supplements for everyone, every single day.
Research is emerging around probiotics contributing to something called antibiotic resistance, essentially the fear that one day there will be no antibiotics left to treat our diseases because the bacteria has outsmarted us.
That is terrifying. It could mean that within this century, people could be dying from common infections that were previously incredibly treatable.
On top of that, probiotic supplementation may not be suitable if you have a weakened immune system or a severe illness.
They can be a good option if you’ve just finished a course of antibiotics or you have IBS, but please have that conversation with your doctor or pharmacist rather than just grabbing something off a shelf.
What I recommend? Fermented foods. Yogurt, sauerkraut, kimchi are all brilliant natural sources of probiotics.
Prebiotics
Prebiotics aren’t live bacteria, but they act as food for the bacteria in your gut, promoting the growth of the good kind.
It’s foods high in fiber. Fruits, veggies, legumes, nuts, seeds, whole grains.
6. Use antibiotics responsibly
Some people believe that all the illnesses in the world could be cured by food and lifestyle changes, and that medications are the devil and just a product of big pharma.
And yes, some medications can have really bad side effects. But modern medicine is also the reason we’re all more likely to live to see our 70th birthday and be happier and healthier when we get there.
So what’s the actual bottom line?
Antibiotics can disrupt the gut microbiome by killing good bacteria. So:
- Only take antibiotics following a doctor’s advice
- Do not take antibiotics sitting in your cupboard from a previous illness
- Do not take antibiotics prescribed for anyone other than yourself
- If you do take a course, ask your doctor whether a probiotic afterwards would be appropriate for you
- And look after your gut health year-round so your immune system is strong enough to fight things off in the first place
7. Manage your stress
You might think that breathing exercises are a load of rubbish. And I get it, because I was exactly the same.
But breathing exercises aren’t just about calming down and taking a moment for yourself. They are a way to hijack your nervous system.
Sympathetic vs parasympathetic nervous system
Think back thousands of years to our cavemen and women ancestors. Imagine running away from a lion. Your breathing is fast and shallow. Adrenaline is racing through your body. You’ve activated fight or flight mode, otherwise known as your sympathetic nervous system.
Now. You’ve run away from the lion. It’s evening. You’ve eaten a nice big meal. You’re safe, hydrated, well fed. Your breathing is slow and deep. Your body is relaxing because you’ve activated your parasympathetic nervous system.
And that shift, from fast and shallow to slow and deep, is something you can deliberately trigger just by changing how you breathe. That’s the biological hack.
Slow, deep breathing is the biological code to activate relaxation in your body.
Helpful practices that help reduce stress levels and promote a healthier gut environment:
- breathing exercises
- meditation
- yoga
- mindfulness
8. Exercise regularly, in whatever way works for you
There is evidence to suggest that high-intensity, low-intensity, and long-duration exercises all have benefits for gut health.
So don’t let anyone tell you what exercise is best. Move your body in a way that feels right for you.
Regular physical activity promotes gut health by:
- Increasing the diversity of gut bacteria
- Improving digestion
- Reducing inflammation
9. Get enough sleep
Aim for 7 to 9 hours of quality sleep every single night.
Good sleep, stress management, and consistent routines can positively influence your gut health. Building healthy morning habits can be a simple way to support both your digestion and mental wellbeing.
Bottom Line
Improving gut health isn’t about quick fixes, detoxes, or trendy supplements. It’s not about being perfect.
It’s about building sustainable habits — eating diverse whole foods, managing stress, moving your body, and getting enough sleep.
Over time, these small changes can create a healthier environment for your gut microbiome and support your overall well-being.
This post is based on insights shared by Dr. Faye Bate, a medical doctor who regularly discusses health topics and breaks down complex medical research into practical, easy-to-understand advice.
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