Here is the article which explains soem of what was going on.
"One of the study's biggest surprises, Hazen said, was how large an impact vegan and vegetarian diets had on the formation of TMAO from carnitine; people in the study who did not habitually eat red meat did not produce the plaque-forming TMAO even when they were given large doses of carnitine in the form of a steak or a supplement. "
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