Trimethylamine N oxide (TMAO) as a prognostic marker among patients at nutritional risk. A secondary analysis of the randomized clinical trial EFFORT European Journal of Clinical Nutrition Frontiers The role of trimethylamine N oxide in disease pathogenesis and the therapeutic potential of traditional Chinese medicine Identification of TMAO producer phenotype and hostdietgut dysbiosis by carnitine challenge test in human and germ free mice Gut TMAO is a byproduct formed by gut bacteria digesting nutrients found in red meat, eggs and other animal products. New research finds high levels of TMAO in the blood predicts the future