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TMAO from Gut Microbes

Microbes metabolize choline and carnitine to TMA; liver oxidizes to TMAO; high TMAO predicts CV risk.

A free, animated tmao from gut microbes you can read here or embed on any website, from Scrollchart.

TMAO from Gut Microbes

TMAO: From Gut Microbes to Cardiovascular RiskPlasma TMAO above 6 µM tracks with a 1.6 to 2.5x increase in MACE risk over 3 yearsDietCholine, carnitine, betaineRed meat, eggs, fishGut microbesCutC/D, CntA/B lyasesAnaerobic gut bacteriaPortal veinTMA absorptionVolatile amine, fishy odorLiver FMO3Flavin monooxygenaseTMA to TMAO oxidationSystemic TMAOCirculating metaboliteExcreted via urineIngestedTMA producedPortal bloodTMAO oxidizedCholine → (CH3)3N-CH2CH2OH→ TMA + acetaldehydeTMA crosses colon wallTMA + O2 → TMAOVascular consequencesFoam cell formationUpregulates CD36 and SR-A1 on macrophages, accelerating oxLDL uptake in arterial intima.Platelet hyper-reactivityLowers calcium release threshold, raises thrombosis risk after low-dose agonists.Reverse cholesterol blockSuppresses bile acid synthesis (CYP7A1) and inhibits cholesterol efflux to HDL.Vegans and long-term plant-based eaters show 4 to 10x lower TMAO peaks after a carnitine challenge; chronic diet pattern reshapes the CutC/CntA gut consortium.FMO3 loss-of-function (trimethylaminuria) blocks TMA → TMAO conversion, causing fishy-odor syndrome and, paradoxically, a more favorable lipid profile.

Dietary choline/carnitine -> microbial conversion to TMA -> portal vein -> hepatic FMO3 oxidation to TMAO -> circulation. TMAO promotes foam-cell formation, platelet aggregation; correlates with MACE.

Good for

  • Cardiovascular nutrition articles (red meat, eggs, fish)
  • Microbiome and chronic disease explainers
  • Patient education for high-CRP or high-TMAO test results

Source & accuracy

This tmao from gut microbes is an editorial illustration built to represent the concept accurately. Where it shows figures, they are typical or representative values chosen to make the relationship clear, not a single underlying dataset. The diagram and its explainer are reviewed and maintained centrally, and updated over time as understanding improves.

A two-step route from food to TMAO

Trimethylamine N-oxide (TMAO) forms in two stages. Gut bacteria first convert dietary nutrients rich in trimethylamine groups, notably choline (abundant in eggs and meat) and L-carnitine (abundant in red meat), into the gas trimethylamine (TMA). The TMA is absorbed and carried to the liver, where the enzyme FMO3 oxidizes it into TMAO.

Because the first step requires specific gut microbes, people with different microbiomes can produce very different amounts of TMAO from the same meal.

What high TMAO does and does not tell us

Higher circulating TMAO has been associated in several studies with increased cardiovascular risk, and mechanistic work links it to processes such as altered cholesterol handling and clot formation. However, much evidence is observational, fish (a healthy food) can raise TMAO directly, and whether TMAO is a driver of disease or mainly a marker remains debated.

TMAO is not a routine clinical test for most people, and dietary decisions should not hinge on it alone. This is general educational information, not medical advice; discuss cardiovascular risk with a qualified clinician.

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Reference

What this is
A free, embeddable, animated tmao from gut microbes for any website.
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Medical educators, Health blogs, Nutrition blogs, Biohacker blogs.
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