We’ve all had those days when our stomachs just feels unsettled – whether it’s the unexpected bloating after a “safe” meal or that sluggish feeling coffee can’t shake. It’s tempting to blame stress or a busy week, but often our gut is sending a clear signal that it needs attention.

Our digestive system is far more than a food processor. It affects immunity, mood, energy, and even our skin texture. Over the past decade, research has revealed just how central gut health is to our overall wellbeing – and why it’s worth looking after it. Yet with shelves full of gut-friendly, gut-boosting, gut-supporting (you name it!) supplements and endless conflicting advice, it’s easy to feel overwhelmed and overspend.

So, what do you really need to keep your gut happy and thriving? And can probiotic-rich food alone be enough? We’ve sifted through the research so you don’t have to.

What really is your gut microbiome?

The human digestive system is home to trillions of microbes, collectively known as the gut microbiome, which play a key role in digestion, nutrient absorption, and immune function. When this ecosystem is balanced, it helps your body function smoothly; when it’s disrupted, it can contribute to digestive issues, fatigue, and even changes in mood.

A healthy gut isn’t just about avoiding bloating after a heavy meal – it’s central to your overall health. To highlight just how far-reaching the microbiome’s influence is, studies have found links between gut bacteria and immune system regulation, mental health, and even metabolic conditions such as obesity and diabetes.

The challenge is that this ecosystem is highly sensitive. A diet high in processed food, ongoing stress, repeated courses of antibiotics, and even something as routine as travel can disrupt the balance of microbes in your gut. But probiotics are here to help us.

What are probiotics, and how can they help your gut?

Probiotics are essentially live, gut-friendly bacteria that help maintain or restore a healthy gut environment. Research shows that specific probiotic strains can support digestive health, helping to regulate bowel movements and reduce symptoms of conditions such as constipation, diarrhoea, and irritable bowel syndrome (IBS).

In addition to their digestive benefits, certain probiotics can help support immune health, as more than 70% of the body’s immune system is located in the gut. By contributing to microbial balance, probiotics may improve the body’s ability to respond to infections and maintain overall wellbeing.

Multiple studies suggest probiotics support digestion (reducing bloating, constipation, diarrhoea), aid recovery after antibiotics, and even support immunity. For example, a 2020 review noted probiotics can reduce antibiotic-associated diarrhoea by about 40%.

Do you really need to take probiotic supplements?

If you can ingest probiotics and support your gut health naturally, why wouldn’t you? Fermented foods like yoghurt, kefir, kimchi, sauerkraut, miso and kombucha, for example, are all fantastic natural sources of probiotics, and some functional drinks contain these too. If you eat plenty of fibre-rich foods and fermented foods, your microbiome might be doing just fine.

But there’s a significant problem with these products: you just don’t know which strains you’re taking or how many bacteria actually survive the journey through your stomach.

Plus, life often gets in the way. General stress, falling ill, taking too many antibiotics, eating highly processed diets, and even just natural ageing can reduce the diversity of gut bacteria. In these cases, probiotics can help restore balance.

Supplements give you more control. You know the bacteria strain, the dose, and can choose a high-quality product that is scientifically proven to make a difference. You should still try and incorporate fermented foods (and others – more on that below!) into your daily diet. Still, most people would benefit from a combination of probiotic-rich foods and a well-formulated supplement, depending on their needs.

Which probiotics should you take?

Different strains of probiotics perform different roles, and not every supplement available has the research behind it to show it survives the stomach’s acidic environment and makes it to the gut alive. That journey is crucial; otherwise, you’re swallowing bacteria that never reach the place they’re supposed to support.

Scientists often point out that the most reliable probiotics are those that have been tested in real people, not just in a lab. One such example is the Lab4 group of bacteria, which has been the subject of multiple UK and international studies on digestion and immune health. These strains are known to survive stomach and bile acids and successfully colonise the gut, which is exactly what you want from a probiotic.

Beyond supplements: what you can do for your gut health

While probiotics can be helpful, they’re only one part of a much bigger picture – how you eat and manage stress in your day-to-day are just (if not more) important. Here are some things to consider adding to your daily routine and diet:

1. Feed the right bacteria with fibre

Beneficial gut bacteria thrive on dietary fibre, especially types known as prebiotics, which act like fertiliser for the microbiome. Foods such as oats, beans, lentils, bananas, and onions contain fibres that your body can’t digest – but your bacteria can. When broken down, these fibres release short-chain fatty acids (like butyrate) that reduce inflammation and strengthen the gut lining. This is one reason why studies consistently link high-fibre diets with lower rates of chronic disease.

2. Eat a rainbow of foods

You shouldn’t just be too concerned with eating “healthy foods”. Instead, simply try to diversify the foods on your plate. Research from the American Gut Project, one of the largest microbiome studies to date, found that people who ate more than 30 different plant-based foods a week had more diverse gut bacteria than those who ate fewer than 10. More diversity generally means more resilience, which may protect against imbalances that lead to digestive issues or weakened immunity.

3. Eat fermented foods

Fermented foods like yoghurt, kefir, kimchi, miso, and sauerkraut don’t just taste good (at least for some) – they contain live cultures that can introduce beneficial bacteria into the gut. A 2021 study from Stanford University showed that a diet high in fermented foods increased overall microbiome diversity and reduced markers of inflammation in adults. These foods aren’t a replacement for probiotics, but they’re an easy (and tasty) way to add more beneficial microbes into your diet.

4. Less stress and more sleep

The gut and brain communicate through a two-way system called the gut–brain axis. Stress hormones like cortisol can alter gut bacteria, and disrupted microbiota can, in turn, affect mood. Studies have found that chronic stress reduces microbial diversity, while good-quality sleep helps restore balance. Practices like mindfulness, yoga, or simply clocking in your seven hours of sleep can therefore directly support your gut’s health.

5. Get moving

We all know we need to exercise to improve blood flow and maintain muscle and bone density, but getting our heart rate up also improves our microbiome. Regular physical activity has been linked to higher levels of beneficial bacteria, particularly those associated with improved metabolic and immune function. You don’t need to run marathons every week (though running is brilliant cardio, especially in summer). Even moderate exercise, like walking or cycling, can help your microbial community become richer and more stable.