Takeaway: The Brain’s Master Clock: How the Circadian System Controls Sleep, Hunger, and Metabolism

Last updated: 19/09/2026 19:29

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The suprachiasmatic nucleus, a rice-grain-sized brain structure, acts as your body's master clock, orchestrating 24-hour rhythms of sleep, hunger, metabolism, and mood. Understanding circadian biology reveals why meal timing, light exposure, and consistent sleep schedules profoundly shape metabolic health and mental wellbeing. — This work by aeroman3 is marked with Public Domain Mark 1.0. To view the terms, visit https://creativecommons.org/publicdomain/mark/1.0/. (Public Domain Mark)

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1️⃣ Morning light resets your master clock (SCN); afternoon/evening light delays it. 2️⃣ Eating late disrupts insulin & leptin when organs are scheduled for fasting. 3️⃣ Shift work misaligns your circadian system, raising risk of obesity, diabetes & depression.

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ByProf. Giorgi Pkhakadze, MD, MPH, PhD

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MD, MPH, PhD. Editor-in-Chief, Georgian Medical Journal (GMJ). Professor and Head, School of Public Health, David Tvildiani Medical University (DTMU), Tbilisi, Georgia. Chair, Public Health Institute of Georgia (PHIG). President, Accréditation Sans Frontières (ASF), Paris. Secretary/Treasurer, UEMS Section of Public Health. WHO Consultant, Health and Migration, Geneva. Former Member, UN Secretary-General's Independent Accountability Panel for Every Woman, Every Child, Every Adolescent (IAP-EWEC, 2016–2021). ORCID: 0000-0001-7609-4515.