The Circadian Code
Circadian biologist Satchin Panda argues that the oldest, most overlooked variable in human health is not what we eat or how much we move but when. Drawing on decades of lab work on mice and a growing body of human studies, he explains how every cell in the body keeps its own clock and how modern life, with round-the-clock eating, late-night screens, shift work, and artificial light, scrambles those clocks in ways that quietly feed obesity, diabetes, mood disorders, and poor sleep. The heart of the book is a practical program built around time-restricted eating, consistent sleep windows, and daylight exposure, framed as small, testable experiments rather than strict rules. It is a readable, research-grounded case that the timing of daily habits matters as much as their content.
What you might want to know about The Circadian Code
The questions readers send us most often, answered without spoilers.
Salk Institute scientist Satchin Panda lays out his lab's research on circadian rhythms, arguing that eating, sleeping, and seeing light at the right hours can prevent disease, with a step-by-step daily program.
The Circadian Code was written by Satchin Panda and published in 2018. Panda is a Salk Institute researcher whose work on circadian rhythms helped popularize time-restricted eating.
The Circadian Code addresses time-restricted eating (a form of intermittent fasting) as part of its broader argument about aligning life with the body's circadian rhythms. The book also covers light exposure, sleep, and exercise timing.
The Circadian Code is 278 pages in standard print editions, though page counts vary slightly between hardcover, paperback, and large-print formats.
At an average reading pace of about 250 words per minute, The Circadian Code takes most readers 4 to 6 hours to finish.
The Circadian Code is a standalone novel by Satchin Panda, not part of a series.
The Circadian Code is available in hardcover, paperback, ebook, and audiobook formats from Amazon, Bookshop.org, ThriftBooks, and most major bookstores.
