Your gut bacteria quietly rework plant coumarins after you eat them
Flores Iglesias JC, Méndez López LF
Medicinal Plants
The fragrant coumarins in plants like sweet woodruff, cassia, and tonka bean don't just get absorbed as-is, your gut microbes chemically remodel them, which can change whether a medicinal plant's active compound ends up helpful or inert by the time it reaches your bloodstream.
Coumarins are the sweet-smelling compounds plants make, found in things like cinnamon, licorice root, and many medicinal herbs. This review found that gut bacteria don't just let these compounds pass through unchanged. They break them apart, add or remove chemical groups, and even build new coumarins from other plant compounds, which can make the final substances more or less active in the body. Scientists identified a bacterial enzyme called NemA that does some of this work, but they still don't know how much this matters for human health or why it varies so much between people.
Key Findings
Gut microbes carry out at least six distinct coumarin transformations: deglycosylation, reduction, O-demethylation, hydroxylation, deprenylation, and lactone ring opening
Multiple human gut bacteria species can reduce coumarins, with the NADPH-dependent enzyme NemA identified as a key driver of this reaction
Gut bacteria can also synthesize simple coumarins from dietary phenolic precursors, and the resulting metabolites can in turn alter the composition of the microbiota itself
chevron_right Technical Summary
Gut bacteria can chemically transform coumarins, the fragrant compounds found in many plants, spices, and medicinal herbs, changing how beneficial or harmful those compounds are once eaten. Scientists are still mapping out which microbes do this and whether it meaningfully affects human health.
Abstract Preview
Original paper
Gut Microbiota-Mediated Biotransformation of Coumarins.
1. Coumarins are plant-derived secondary metabolites widely present in foods, spices, and medicinal plants. Their limited intestinal absorption and extensive host metabolism allow a variable fracti...
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