The science of winter depression with Prof. Debra Skene – leading chronobiologist

What It Covers

Professor Debra Skene explains how circadian rhythms control metabolism, sleep, and mood. She provides evidence-based strategies for using light exposure and meal timing to optimize health during winter months and reduce disease risk.

Key Questions Answered

• •Night shift health risks: Working night shifts increases risk of type 2 diabetes, cardiovascular disease, and cancer because eating at night causes exaggerated triglyceride responses. The body metabolizes identical meals differently at midnight versus lunchtime, compromising long-term metabolic health.
• •Morning light exposure: Going outside within one to two hours of waking provides 50,000 to 100,000 lux of daylight, which is 500 times more intense than indoor artificial light. Even overcast winter days in northern climates deliver sufficient blue-enriched light to synchronize body clocks.
• •Social jet lag impact: A two-hour difference between weekday and weekend wake times associates with increased body weight and reduced mood. This mismatch between work schedules and natural body clock timing creates metabolic disruption similar to crossing time zones regularly.
• •Meal timing consistency: Bodies develop memory of regular meal patterns. Eating at consistent times daily allows peripheral clocks in the liver, pancreas, and muscles to optimize glucose processing. Food shifts glucose rhythms by five hours but does not affect the master brain clock.