Akkermansia: The Gut Bacterium Everyone's Talking About — and Why Your Levels Are Low
By Joana Amram — Registered Nutritional Therapist (ANP/APENB), CNM London · Gut health & the microbiome · Lisbon & online · joana-amram.com
Every so often a single gut bacterium jumps from the research journals into the mainstream conversation. Right now, that bacterium is Akkermansia muciniphila.
It's earned the attention. Akkermansia is one of the most studied organisms in the gut, and the findings are genuinely striking — it's associated with a stronger gut lining, better metabolic health, and, in some of the most interesting research, with how the immune system responds during certain cancer treatments.
And yet, when microbiome testing comes back, low Akkermansia is one of the most common findings. Something about modern life is depleting it. Let's look at what it does, what the research actually says, and why levels are so often low.
What Akkermansia does
Akkermansia is unusual. While most beneficial gut bacteria feed on the fibre you eat, Akkermansia lives in and feeds on the mucus layer that lines your gut — and this turns out to be a feature, not a problem.
By grazing on that mucus layer in a controlled way, Akkermansia actually stimulates your gut to produce more of it. The result is a thicker, healthier mucus barrier — the physical buffer between the contents of your gut and your gut wall, and central to preventing the increased intestinal permeability often called "leaky gut."
It also produces short-chain fatty acids that nourish the gut lining and calm inflammation, and tends to make up a meaningful slice — often around 1–4% — of a healthy gut microbiome.
What the research associates with Akkermansia
Metabolic health
The most established link. Healthier metabolic profiles tend to come with more Akkermansia, while lower levels are associated with obesity and type 2 diabetes.
A stronger gut barrier and less inflammation
Through its effect on the mucus layer, Akkermansia is associated with reduced intestinal permeability and lower systemic inflammation.
Immune function during cancer treatment
This is the headline that put Akkermansia in the news. In landmark research, patients who responded well to certain cancer immunotherapies tended to have Akkermansia in their gut, while non-responders often didn't [1].
It's worth being precise here. This is a research association with how the immune system behaves during treatment. It does not mean Akkermansia treats, prevents or cures cancer, and nobody should approach it that way. What the research points to is the broader, well-supported theme — that the gut microbiome and the immune system are deeply intertwined, and that a healthy microbiome matters for immune function. That's the takeaway worth holding.
Why modern levels are so often low
If Akkermansia is so beneficial, why is it so commonly depleted? The drivers all point at features of modern living:
The modern diet
Akkermansia is fed and supported by polyphenols — the colourful plant compounds in berries, pomegranate, grapes, green tea, cranberries and extra virgin olive oil. A diet low in plant diversity and polyphenols, and high in ultra-processed food, simply doesn't support it. This is probably the single biggest factor.
Antibiotics
Antibiotics can significantly reduce Akkermansia, and it doesn't always bounce back quickly. Repeated courses over a lifetime add up.
Low plant diversity
The modern Western diet is far narrower in plant variety than traditional ones. Less diversity in, less diversity out — and Akkermansia is one of the species that suffers.
Ageing
Levels tend to decline with age, which is part of why supporting it becomes more relevant over time.
A damaged mucus layer
Here's the vicious cycle: Akkermansia needs a healthy mucus layer to live in, but a poor diet, chronic inflammation and certain processed-food emulsifiers erode that layer — reducing its habitat, which weakens the layer further.
How to support Akkermansia
The encouraging part: diet has a real, measurable effect. You can shift it.
Eat polyphenol-rich foods — the big one. Berries (especially cranberries and pomegranate), grapes, green tea, extra virgin olive oil, dark chocolate and a wide range of colourful plants.
Prioritise plant diversity — variety across the week beats the same few vegetables. Diversity of plants drives diversity of microbes.
Include the right fibres — oats, and resistant starch from cooled cooked potatoes and rice, feed the broader community Akkermansia lives within.
Mind the gaps between meals — the same structured-meal-timing principle that helps motility helps the mucus layer too.
Use antibiotics judiciously — only when genuinely needed, with attention to rebuilding afterwards.
Cut ultra-processed foods — particularly those high in emulsifiers, which can erode the mucus layer Akkermansia depends on.
Akkermansia is now sold as a (pasteurised) supplement with some research behind it — but I'd start with the diet, because the food approach feeds the whole ecosystem rather than dropping one organism into an environment that may not support it.
This kind of microbiome rebuilding — feeding the right species rather than chasing one — is the heart of what I do. See how I work →
The takeaway
Akkermansia is a remarkable bacterium — guardian of your gut lining, friend to your metabolism, and a vivid example of how intertwined the gut and immune system are. Modern diets tend to deplete it, but the good news is it responds well to exactly the kind of colourful, diverse, polyphenol-rich eating that supports gut health across the board. You don't need to chase a single bacterium — feed the ecosystem well, and Akkermansia tends to look after itself.
Want to rebuild a depleted microbiome the right way? Book a free 15-minute discovery call and let's talk through where to start. Book your free call →
This article is for educational purposes only and is not medical advice. Akkermansia's links to immune function are research associations, not treatments for any disease. Please consult a qualified healthcare practitioner, and work alongside your medical team.
FAQ
Should I take an Akkermansia supplement? There's some research behind the pasteurised supplement, but I'd start with diet for most people — polyphenols and plant diversity feed the whole ecosystem rather than adding one organism in isolation. Whether a supplement makes sense depends on your individual picture.
How do I know if my Akkermansia is low? Microbiome stool testing can show relative abundance. But you don't necessarily need a test to act — a diet low in colourful plants and high in processed food is the classic setup for low levels, and the dietary fix is the same either way.
Does Akkermansia help with leaky gut? It's associated with a thicker, healthier mucus barrier and reduced intestinal permeability — so supporting it is part of supporting that barrier. It's one piece of the picture, not a single fix.
Do you consult in other languages? Yes — English, Portuguese, Spanish and French, online worldwide and in person in Lisbon. Book a free call in your preferred language.
Related reading
References
Routy B, et al. Gut microbiome influences efficacy of PD-1–based immunotherapy against epithelial tumors. Science. 2018. https://www.science.org/doi/10.1126/science.aan3706