Akkermansia
Also called: Akkermansia muciniphila, A. muciniphila
Akkermansia muciniphila is a gut bacterium that lives in the mucus layer lining the colon. It's one of the most studied microbes in human research because lower levels associate with obesity, type 2 diabetes, inflammation and a weaker gut barrier. It feeds on the mucus the gut produces, which sounds odd but actually keeps mucus turnover healthy. You can encourage it with polyphenols, fibre and intermittent fasting.
Why it matters
Akkermansia is a 'keystone' species in the gut microbiome, it shapes the environment for other species and makes up 1 to 4 percent of healthy adult gut bacteria. People with obesity, type 2 diabetes, IBD, and metabolic syndrome consistently have lower levels. Causation is still being worked out, but the associations are strong enough that pasteurised Akkermansia is being trialled as a metabolic health supplement.
What it does in the gut
- Lives in and degrades mucin (the protein that makes gut mucus). This sounds destructive but it stimulates the gut to produce fresh mucus, keeping the barrier robust.
- Strengthens tight junctions between gut cells, reducing the kind of permeability sometimes called leaky gut.
- Produces propionate and acetate (short-chain fatty acids) from mucin, feeding other beneficial species.
- Reduces low-grade inflammation by calming the gut immune response.
How to encourage it
- Eat polyphenol-rich foods: berries, cranberry, grapes, red onion, extra virgin olive oil. The strongest evidence is for cranberry and grape polyphenols; results for green tea and pomegranate have been inconsistent.
- Eat resistant starch (cooked-and-cooled potato, slightly green bananas, cooked-and-cooled rice) and inulin (onion, leek, garlic, asparagus, Jerusalem artichoke).
- Try a longer overnight fasting window. A small study found Akkermansia abundance rose after a period of daily fasting, though the evidence is preliminary and the mechanism is not established.
- Avoid frequent antibiotic courses where possible. Antibiotics can disrupt the gut microbiome broadly, though A. muciniphila itself is resistant to several common antibiotics including metronidazole and vancomycin.
- Get omega-3 (oily fish 2 times a week, or supplement). In a human gut-simulator study, omega-3 fish oil increased Akkermansia abundance.
Akkermansia supplements
Pasteurised Akkermansia muciniphila is sold by some companies (Pendulum, Akesi). The pasteurised form is dead but still produces benefits in trials, possibly through its outer membrane protein Amuc_1100. Evidence is early. Cost is meaningful. For most people, eating the foods Akkermansia prefers is more cost-effective than supplementing.
Common questions
- Does Akkermansia help with weight loss?
- In small trials, yes, modestly. A 3-month trial of pasteurised Akkermansia in overweight adults showed about 2 kg of weight loss versus placebo, though this did not reach statistical significance (P = 0.091); the improvement in insulin sensitivity was significant. Any weight effect is small and far below GLP-1 medications. Probably most useful as part of a broader gut-supportive plan.
- Can I test my Akkermansia level?
- Some consumer microbiome tests (Tiny Health, Viome, BiomeSight) report Akkermansia abundance. Levels fluctuate with diet within days, so a single snapshot is limited. Useful for trend-tracking over months, not for spot diagnoses.
- Why does it feed on mucus instead of food?
- Niche specialisation. Most gut bacteria compete for dietary fibre. Akkermansia evolved to live on mucin glycoproteins instead, which means it has a stable food source even when you're fasting. The mucus turnover this drives is what keeps the gut barrier healthy.
- Are there foods that kill Akkermansia?
- Diets very high in saturated fat and very low in fibre suppress Akkermansia consistently in studies. Repeated antibiotic courses can disrupt the wider gut microbiome, though A. muciniphila itself is resistant to several common antibiotics.
Sources
- Pasteurised Akkermansia muciniphila in overweight/obese adults (Depommier proof-of-concept RCT, 2019) (Nature Medicine (PMID 31263284))
- A purified membrane protein from Akkermansia muciniphila or the pasteurized bacterium improves metabolism in obese and diabetic mice (Plovier et al, 2017) (Nature Medicine (DOI 10.1038/nm.4236))
- Akkermansia muciniphila is a promising probiotic (review of abundance, SCFAs, disease associations) (Microbial Biotechnology (PMC6801136))
- A next-generation beneficial microbe: Akkermansia muciniphila (1-4% abundance, gut barrier integrity) (United European Gastroenterology Journal (PMC6064808))
- Akkermansia muciniphila: a microbial guardian (keystone species, Amuc_1100/TLR2 tight junctions, anti-inflammatory) (PMC (PMC12551360))
- Strategies to promote abundance of Akkermansia muciniphila: dietary intervention review (polyphenols, fibre/FOS, high-fat suppression) (Frontiers in Microbiology (PMC6223323))
- Islamic fasting increases Akkermansia muciniphila abundance (preliminary intermittent fasting study) (Turkish Journal of Gastroenterology (PMC6924600))
- Antimicrobial resistance profile of Akkermansia muciniphila DSM 22959 (resistant to metronidazole, vancomycin, penicillin) (Microorganisms (PMC9367757))
- Short-term omega-3 PUFA supplementation modulates mucolytic species including Akkermansia (human gut simulator) (Gut Microbes (PMC9481098))