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Carnivores convert carnitine, but can vegetarians?

Trimethylamine N-oxide (TMAO) is associated with an increased disease risk. It's manufactured with the help of the gut microbiome from L-carnitine. Vegetarians make less TMAO from L-carnitine than omnivores do. The question is: why?

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Study under review: l-Carnitine in omnivorous diets induces an atherogenic gut microbial pathway in humans

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