Gut Enterotypes Explained: What Your Microbiome Type Means for Your Health

Key takeaways

• Gut enterotypes group people by the bacteria that dominate their gut. Most research describes three, named after Bacteroides, Prevotella and Ruminococcus (Arumugam et al., 2011).
• Your long-term diet is one of the strongest factors linked to your enterotype. Fibre and plant foods tend to favour Prevotella; animal protein and fat tend to favour Bacteroides (Wu et al., 2011).
• Enterotypes are not fixed boxes. Scientists now see them as points along a spectrum rather than strict categories (Arumugam et al., 2014; Costea et al., 2018).
• The “Bacteroides 2” (Bact2) pattern has been linked with lower diversity and inflammation. It was identified through quantitative profiling (Vandeputte et al., 2017) and later associated with inflammation (Vieira-Silva et al., 2019) — an association, not proof of cause.
• A stool-based gut microbiome test is the only way to see your own gut community and get personalised support.

If you have spent months or years dealing with bloating, irregular bowel habits or discomfort, you may have come across the term “gut enterotypes”. It sounds technical, but the idea is simpler than it first appears. Below, we cover what the science actually says, why your enterotype might matter, and what you can practically do about it.

What are gut enterotypes?

Gut enterotypes are a way of grouping people by the bacteria that dominate their gut. Most research describes three broad types, each named after its leading bacteria (Arumugam et al., 2011). The concept comes from a 2011 study that grouped people by the microbes in their stool and found that most fell into one of three clusters.

Each type is named after the bacteria that tends to lead it:

• Bacteroides — often linked with diets high in animal protein and fat.
• Prevotella — often linked with diets high in fibre and plant foods.
• Ruminococcus — a more mixed group, less clearly tied to one diet.

Two bacterial families dominate the adult gut overall: the Bacteroidetes (now formally Bacteroidota) and the Firmicutes (now Bacillota). Enterotypes are essentially a shorthand for which of these community patterns is in the driving seat. Strikingly, the original researchers found the types did not depend on a person’s age, sex, weight or country (Arumugam et al., 2011) — suggesting gut communities settle into a few recurring states rather than looking completely random.

How does your diet shape your gut enterotype?

Your long-term diet is one of the strongest factors linked to your enterotype. People who eat more animal protein and fat tend to have a Bacteroides-led gut, while those who eat more fibre and plant foods tend to have a Prevotella-led gut (Wu et al., 2011). This is a pattern set over months and years, not by yesterday’s dinner.

Short-term changes matter too, but less than you might expect. In the same research, switching diets shifted the balance of gut bacteria within a day, yet a person’s overall enterotype stayed the same across the controlled ten-day study (Wu et al., 2011). In other words, the balance within your type can move quickly, but the type itself is sticky.

What is the Prevotella-to-Bacteroides (P/B) ratio?

The Prevotella-to-Bacteroides (P/B) ratio is a simple measure of how much Prevotella your gut carries relative to Bacteroides, and it may predict how you respond to certain diets. In one randomised controlled trial, people with a high P/B ratio (more Prevotella) lost significantly more body fat on a high-fibre diet than people with a low P/B ratio — a difference of around 3 kg more fat loss on the fibre-rich diet (Hjorth et al., 2018). This is early, evolving science, but it hints that your gut community may influence which eating pattern works best for you.

Are enterotypes fixed types, or a spectrum?

Enterotypes are best understood as points along a spectrum, not fixed boxes. The original idea of three neat groups was useful but was quickly debated, and the original authors later clarified that enterotypes were never meant to be seen as strict, separate categories (Arumugam et al., 2014).

A larger follow-up review reached the same conclusion: enterotypes are real and useful, but they sit along a gradient (Costea et al., 2018). Think of it less like blood types, which are fixed, and more like a range of colours that blend into one another. So your enterotype is best read as a general leaning, not a permanent label — a distinction worth remembering when you meet bold claims online.

What does the Bacteroides 2 (Bact2) enterotype mean for gut health?

The Bacteroides 2 (Bact2) enterotype is a pattern marked by low bacterial diversity and low microbial load, and it has been associated — but not causally — with inflammation and some long-term conditions. It was first identified through quantitative microbiome profiling (Vandeputte et al., 2017) and later linked to inflammatory conditions, including inflammatory bowel disease (Vieira-Silva et al., 2019).

Bact2 at a glance:

The low level of Faecalibacterium is notable, because it is one of the gut’s main producers of butyrate, a compound linked with a calmer, better-nourished gut lining.

It is important to be careful here: these are associations, not proof that Bact2 causes disease. It may be a marker that travels alongside other things rather than a cause in itself, and researchers are still working out what it means in everyday practice. Even so, it shows why looking at your gut community as a whole is more useful than fixating on a single “good” or “bad” bacterium.

Can you change your gut enterotype, and should you try?

You can shift the balance within your enterotype, but slowly, and diet is the main lever. Your enterotype reflects long-term habits, so it does not flip overnight — but steady changes, particularly to fibre, can move the community over time.

Rather than chasing a particular “type”, a more practical goal is to support a diverse, resilient gut. That usually means:

• Eating a wide range of plants — vegetables, fruit, pulses, nuts and seeds.
• Getting plenty of fibre from whole foods.
• Limiting ultra-processed foods where you can.

Certain beneficial microbes, such as Akkermansia muciniphila, tend to thrive on this kind of varied, plant-rich pattern. These steps will not force your gut into a new category, but over time they help build the kind of community that many studies associate with better gut health.

A caveat if you have IBS: increasing fibre — especially fermentable fibres such as inulin (found in chicory root, onion, garlic and Jerusalem artichoke) — can trigger or worsen bloating, wind and abdominal pain in some people. Increase fibre gradually, and if you have IBS consider working with a registered dietitian or your GP, who may recommend a structured approach such as a supervised low-FODMAP diet rather than simply adding more fibre.

When should you see a GP?

See your GP before making major dietary changes if you have any “red flag” symptoms, as these need proper assessment rather than self-management. Enterotype patterns and gut testing are not a substitute for medical review. Contact your GP if you notice:

• Blood in your stool or bleeding from your bottom.
• A persistent change in bowel habit (looser or more frequent stools) lasting three weeks or more.
• Unexplained weight loss.
• Persistent tiredness or symptoms that could suggest iron-deficiency anaemia.
• A lump or persistent pain in your tummy.
• New bowel symptoms if you are over 50.

These signs do not mean anything serious is wrong, but they should always be checked by a healthcare professional first.

How can you learn about your own gut microbiome?

You cannot know your enterotype by guessing — it takes a stool test that analyses the bacteria in your gut. A gut microbiome test maps your community and, ideally, pairs the results with expert interpretation so they translate into action. You may like to check our our blog around what the microbiome actually is for a deep dive.

At Healthpath, the Ultimate Gut Health Test uses an advanced stool test to map your gut microbiome. A qualified practitioner then reviews your results alongside your symptoms, and you receive a personalised plan covering food, lifestyle and, where helpful, supplements — plus a recorded video walking you through your results in plain language.

If your symptoms point to something more specific, such as bloating that builds through the day, a different test may suit you better. The SIBO Test uses a breath test to explore whether small intestinal bacterial overgrowth could be playing a part. Your practitioner can help you choose the right starting point.

Understanding your own gut turns a general idea — like enterotypes — into something personal you can act on, which is far more useful than reading about averages.

Conclusion

Gut enterotypes are a helpful way to think about your microbiome: they remind us that gut health is about the whole community, not one bacterium, and that your gut is closely tied to what you eat over the long term. Just remember your enterotype is a general leaning, not a life sentence. With steady, plant-rich eating and the right support, you can work towards a more diverse and resilient gut.

Frequently asked questions

How many gut enterotypes are there?

Most research describes three main enterotypes: Bacteroides, Prevotella and Ruminococcus (Arumugam et al., 2011). More recent work has described further patterns, such as Bacteroides 2 (Vandeputte et al., 2017). Scientists now view these as points along a spectrum rather than fixed groups.

Is one enterotype healthier than another?

No single enterotype is simply “good” or “bad”. Each is linked with different diets and traits. Some patterns, such as Bacteroides 2, have been associated with inflammation in certain studies (Vieira-Silva et al., 2019) — but association is not the same as cause. Overall diversity and diet quality matter more than a label.

Can I change my gut enterotype with diet?

Your enterotype is fairly stable and reflects long-term habits. Diet — and fibre in particular — is the main factor linked with the balance of your gut bacteria (Wu et al., 2011). Lasting change tends to come from steady habits over time rather than short bursts.

How do I find out my enterotype?

A stool-based gut microbiome test is the most reliable way to see your gut community. The Ultimate Gut Health Test offers this, along with a practitioner review and a personalised plan.

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This article is for general information only. It is not intended to diagnose, treat, cure or prevent any disease. Always speak to a qualified healthcare professional about your individual health.

Scientific references

1. 1. Arumugam M, Raes J, Pelletier E, et al. Enterotypes of the human gut microbiome. Nature. 2011;473(7346):174–180. DOI: 10.1038/nature09944
   2. Wu GD, Chen J, Hoffmann C, et al. Linking long-term dietary patterns with gut microbial enterotypes. Science. 2011;334(6052):105–108. DOI: 10.1126/science.1208344
   3. Arumugam M, Raes J, Pelletier E, et al. Addendum: Enterotypes of the human gut microbiome. Nature. 2014;506:516. DOI: 10.1038/nature13075
   4. Costea PI, Hildebrand F, Arumugam M, et al. Enterotypes in the landscape of gut microbial community composition. Nature Microbiology. 2018;3(1):8–16. DOI: 10.1038/s41564-017-0072-8
   5. Vandeputte D, Kathagen G, D’hoe K, et al. Quantitative microbiome profiling links gut community variation to microbial load. Nature. 2017;551(7681):507–511. DOI: 10.1038/nature24460
   6. Vieira-Silva S, Sabino J, Valles-Colomer M, et al. Quantitative microbiome profiling disentangles inflammation- and bile duct obstruction-associated microbiota alterations across PSC/IBD diagnoses. Nature Microbiology. 2019;4(11):1826–1831. DOI: 10.1038/s41564-019-0483-9
   7. Hjorth MF, Roager HM, Larsen TM, et al. Pre-treatment microbial Prevotella-to-Bacteroides ratio determines body fat loss success during a 6-month randomised controlled diet intervention. International Journal of Obesity. 2018;42(3):580–583. DOI: 10.1038/ijo.2017.220