{"id":14322,"date":"2026-09-07T13:44:02","date_gmt":"2026-09-07T13:44:02","guid":{"rendered":"https:\/\/www.kauveryhospital.com\/blog\/?p=14322"},"modified":"2026-09-07T13:44:02","modified_gmt":"2026-09-07T13:44:02","slug":"what-is-tmao","status":"publish","type":"post","link":"https:\/\/www.kauveryhospital.com\/blog\/family-and-general-medicine\/what-is-tmao\/","title":{"rendered":"What is TMAO?"},"content":{"rendered":"

Summary<\/strong><\/h2>\n

Trimethylamine N-oxide (TMAO) is a metabolite formed when gut bacteria break down compounds such as choline and carnitine. The resulting trimethylamine (TMA) is absorbed into the bloodstream and converted into TMAO, mainly in the liver. Research suggests that elevated levels of TMAO in the blood may be associated with a higher risk of cardiovascular disease, chronic kidney disease<\/a> and inflammation, although links with conditions such as diabetes and fatty liver disease are still being studied.<\/p>\n

Foods containing choline and carnitine, particularly red meat, eggs and dairy products, can contribute to TMA production. Fish and seafood can also contribute to circulating TMAO because they may contain TMAO directly. Certain supplements containing carnitine or choline may also increase TMAO production.<\/p>\n

A diet rich in fibre and plant-based foods, such as a Mediterranean-style diet,<\/a> may help influence the gut microbiome and lower circulating TMAO levels. Limiting excessive consumption of red and processed meat and avoiding unnecessary carnitine supplements may also help. However, TMAO is still an area of active research, and lowering TMAO has not yet been established as a way to prevent cardiovascular or other diseases.<\/p>\n

What is TMAO?\u00a0<\/strong><\/h2>\n

Trimethylamine N-oxide (TMAO) is a metabolite formed through the interaction between the gut microbiome and the body’s metabolism. Gut bacteria can break down dietary compounds such as choline and carnitine to produce trimethylamine (TMA). TMA is then absorbed into the bloodstream and transported to the liver, where it is converted into TMAO, primarily by an enzyme called flavin-containing monooxygenase 3 (FMO3). TMAO is subsequently removed from the body mainly through the kidneys.<\/p>\n

There is growing evidence that higher levels of circulating TMAO may be associated with an increased risk of cardiovascular disease and chronic kidney disease. However, researchers are still investigating whether TMAO itself directly causes these conditions or whether it is partly a marker of other dietary, metabolic and kidney-related factors.<\/p>\n

Choline and carnitine are essential nutrients that are found in a variety of foods. Eggs, meat, poultry and dairy products contain significant amounts of choline, while carnitine is particularly abundant in red meat and is also found in dairy products and other animal-derived foods.<\/p>\n

TMAO \u2013 A biomarker for heart disease\u00a0<\/strong><\/h2>\n

A study conducted in 11,768 participants tracked the relationship between circulating TMAO and heart failure over a median follow-up period of almost 16 years. During this period, 2,102 cases of heart failure occurred. Researchers found that higher concentrations of TMAO were associated with an increased risk of developing heart failure, even after adjusting for traditional cardiovascular risk factors.<\/p>\n

These findings suggest that TMAO may have potential as a biomarker of cardiovascular risk<\/strong>. However, TMAO is not currently established as a standalone screening test for heart failure<\/a>, and further research is needed to determine whether directly lowering TMAO can reduce the risk of cardiovascular disease.<\/p>\n

Foods that can influence TMAO levels\u00a0<\/strong><\/h2>\n

Dietary choices can influence TMAO levels through several pathways. Foods containing choline and carnitine can provide substrates for gut bacteria to produce TMA. In addition, some fish and seafood naturally contain TMAO.<\/p>\n

Foods that may contribute to higher TMAO levels include:<\/p>\n