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  • When your pee is really yellow

    • Yellow urine in the morning...

    Why Is Pee Yellow? Researchers Say They’ve Finally Figured it Out

    Key Takeaways

    • Researchers have discovered that urine is yellow because of an enzyme called bilirubin reductase that’s made by certain microbes in the gut.
    • Experts say different individual factors influence your urine color, including hydration levels, diet, vitamins, medications, and health conditions.

      Urine color chart infection

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    • If you notice a sudden change in urine color or have unusual urine colors consistently, it’s best to bring it up with your healthcare provider.

    Have you ever wondered why your pee is yellow?

    Until recently, not even scientists who study the human body had a clear answer to the urine color conundrum.

    Now, researchers have published a study showing that pee’s yellow hue is caused by an enzyme called bilirubin reductase (BilR), which is produced by certain microbes in the gut.

    “This enzyme discovery finally unravels the mystery behind urine’s yellow color,” Brantley Hall, PhD, lead author of the study and assistant professor at the University of Maryland, said in a news release.

    “It’s remarkable that

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