Unlike Glycerophosphocholine or Choline Chloride, Dietary Phosphatidylcholine Does Not Increase Plasma Trimethylamine- N -Oxide Levels in Sprague-Dawley Rats.
Level 5 - mechanism / opinion, no new human data
Non-human animal study (Sprague-Dawley rats)
PubMed 35050186 · doi:10.3390/metabo12010064
What was done
Sprague-Dawley rats were fed diets containing different choline sources—phosphatidylcholine (PC), glycerophosphocholine (GPC), or choline chloride (CC)—to compare their effects on plasma trimethylamine-N-oxide (TMAO) concentrations and gut microbiota composition at the genus level.
What was found
Dietary GPC and CC significantly elevated plasma TMAO levels, whereas dietary PC did not. Plasma TMAO levels correlated negatively with the relative abundances of Anaerotruncus, Actinomyces, Enterococcus, Dialister, Clostridium XIVa, and Granulicatella, and positively with Coprobacter. Relative abundances of Anaerotruncus and Coprobacter predicted plasma TMAO levels. No numerical values or effect sizes were reported in the abstract.
Why it matters
This study shows that TMAO production in vivo depends on the specific chemical form of dietary choline, suggesting that phosphatidylcholine does not drive TMAO elevation in the same manner as choline chloride or glycerophosphocholine.
Limits
Findings are from a rodent model and cannot be directly extrapolated to human physiology or gut microbiota. The abstract reports no sample size, intervention duration, dietary dosages, baseline controls, or numerical data.
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