Can a plant chemical fix sleep rhythm problems when vitamin D is low?
Quercetin improved hepatic circadian rhythm dysfunction in middle-aged mice fed with vitamin D-deficient diet
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When mice didn't get enough vitamin D, their liver's internal clock got mixed up. Giving them quercetin (a plant chemical) fixed part of the clock — especially a protein called CLOCK — but didn't help their blood sugar problems.
Surprising Findings
Quercetin reduced Bmal1 mRNA in vitamin D-deficient mice—but increased BMAL1 protein at the same time.
It’s counterintuitive: lowering the gene’s message while increasing the protein output. This suggests quercetin is interfering with post-transcriptional regulation, not gene activation.
Practical Takeaways
If you’re vitamin D deficient and taking quercetin for metabolism, consider testing your insulin levels—this study suggests it won’t help.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When mice didn't get enough vitamin D, their liver's internal clock got mixed up. Giving them quercetin (a plant chemical) fixed part of the clock — especially a protein called CLOCK — but didn't help their blood sugar problems.
Surprising Findings
Quercetin reduced Bmal1 mRNA in vitamin D-deficient mice—but increased BMAL1 protein at the same time.
It’s counterintuitive: lowering the gene’s message while increasing the protein output. This suggests quercetin is interfering with post-transcriptional regulation, not gene activation.
Practical Takeaways
If you’re vitamin D deficient and taking quercetin for metabolism, consider testing your insulin levels—this study suggests it won’t help.
Publication
Journal
Journal of Physiology and Biochemistry
Year
2023
Authors
Rui Li, Guiping Wang, Rui Liu, Lan Luo, Ying Zhang, Zhongxiao Wan
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Claims (4)
When middle-aged mice don't get enough vitamin D, their blood sugar control gets worse in the evening, but giving them quercetin—a plant compound—doesn't help fix it.
When middle-aged mice don't get enough vitamin D, their body's internal clock gets mixed up: some clock proteins drop, but one important one goes up—even though the genes making them didn't change much. It's like the recipe book says 'make more,' but the kitchen isn't following it.
When older mice don't get enough vitamin D, giving them quercetin (a plant compound) changes some of their body clock genes and increases a key clock protein at a specific time of day—but if the mice have enough vitamin D, quercetin doesn't do anything noticeable.
When older mice don't get enough vitamin D, giving them quercetin (a plant compound) makes a key body clock gene less active at a specific time of day—but only when they're also low on vitamin D. If they have enough vitamin D or don't get quercetin, this doesn't happen.