Circadian disruption, clock genes, and metabolic health.
Level 5 - mechanism / opinion, no new human data
Narrative review of animal models and epidemiological studies without systematic search or meta-analysis.
PubMed 39007272 · doi:10.1172/JCI170998
What was done
This is a narrative review synthesizing evidence from in vivo animal models and human epidemiological studies. The authors summarized the mechanistic links between circadian rhythm disruption, core clock gene expression (specifically CLOCK, BMAL1, PER, and CRY), and downstream metabolic pathologies including obesity, metabolic syndrome, and type 2 diabetes.
What was found
No quantitative data or effect estimates are reported in the abstract. The authors report that the expression of core circadian genes and hundreds of circadian output genes regulate cellular metabolism, and that disruption of these pathways links circadian misalignment to adverse metabolic outcomes, cardiovascular disease, and cancer.
Why it matters
It highlights how molecular circadian clock networks intersect with cellular metabolism, framing circadian disruption as a biological risk factor for major metabolic disorders.
Limits
As a narrative review, it presents selected literature rather than a systematic review or meta-analysis and provides no new empirical data. The abstract reports no quantitative findings or study counts, and relies heavily on mechanism-based reasoning and animal models to infer human pathophysiology.
Cited by
- supports Among the top ten causes of death in industrialized nations, five or six are chronic diseases associated with circadian disruption.