Could optimizing your circadian rhythm be the most important health intervention of all?
In this show, I take a trip around the 24-hour clock, exploring fascinating ideas about light, leptin, metabolism, sleep, and circadian biology. We’ll look at why direct outdoor light in the morning matters, why eating after dark can cause more fat storage than eating the same number of calories at a different time, and how our modern use of artificial light may be extending “summer” throughout the year.
I also explain why the hours from midnight to 3:00 AM are so important for darkness, leptin, human growth hormone, and the body’s overnight repair processes—and why these issues may be especially relevant for post-menopausal women.
I wrap it all up with four simple ways to get your circadian rhythm working in your favor: mellow evenings, a dark and cool sleeping environment, energetic mornings, and napping when you need it. I explain why caffeine can override the sleepiness signal your body is trying to send you, and why insufficient sleep can make you 20% slower at everything you do—while making you less aware of it.
I’ll also share emerging research on sunlight and immune regulation, including the fascinating field of photoimmunology, plus the sleep-cooling technology I’m currently enjoying with the Somnus Sleep System.
The big takeaway? Before you chase complicated health protocols, make sure you’re respecting the biological rhythms that have governed human health for far longer than artificial light, smartphones, and Netflix queues.
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