Wide release: February 23, 2026. Not medical advice.
TOPICS DISCUSSED:
Master circadian clock in the brain: Light detection via retina entrains the suprachiasmatic nucleus, which coordinates body-wide rhythms; intrinsic period slightly deviates from 24 hours, allowing seasonal flexibility.
Peripheral clocks in organs: Nearly all cells have autonomous clocks; liver and fat clocks rapidly adjust to feeding time, while brain clock aligns more tightly to light.
Clock mutations and metabolism: Disrupting core clock genes (e.g., CLOCK, BMAL1) causes obesity, liver fat accumulation, and impaired insulin secretion without hyperinsulinemia.
Timing of food intake: Eating the same high-fat calories during rest phase causes more weight gain than during active phase due to differences in energy dissipation.
Modern disruptions (jet lag, shift work, blue light): Create desynchrony between brain and peripheral clocks, contributing to metabolic issues; late-night eating impairs glucose handling.
Critical illness & feeding: Tube feeding at night (opposite natural cycle) induces rapid insulin resistance, highlighting mismatch costs.
Hormone rhythms: Testosterone, glucocorticoids, and others peak at specific times; misalignment affects stress, reproduction, and metabolism.
Weight loss drugs & maintenance: GLP-1 drugs reduce intake effectively, but regain involves neuroendocrine adaptations tied to brain clock pathways.
ABOUT THE GUEST: Joseph Bass, MD, PhD is Chief of Endocrinology, Metabolism and Molecular Medicine at Northwestern University Feinberg School of Medicine, Director of the Center for Diabetes and Metabolism, and a leading researcher who pioneered the link between circadian clock genes and metabolic disorders including obesity and diabetes.
RELATED EPISODE:
M&M 237 | Circadian Biology: Genetics, Behavior, Metabolism, Light, Oxygen & Melatonin | Joseph Takahashi
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PRACTICAL TAKEAWAYS:
Maintain consistent daily schedules for sleep, wake, and meals (including weekends) to support metabolic health and reduce “social jet lag” effects.
Avoid routine late-night eating, as it impairs energy handling and links to weight gain and glucose issues.
Prioritize calorie control for weight loss, but use consistent timing to aid adherence and energy balance.
For metabolic conditions like diabetes, monitor how meal timing affects glucose response (e.g., via CGM).
SUBSCRIBER CONTENT BELOW: Reference paper + episode transcript.
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