Health
by Satchin Panda
Does it matter when you eat?
Satchin Panda studies the body's daily rhythms at the Salk Institute in California. The Circadian Code argues that the timing of your meals, sleep and light matters for your health, and that modern life keeps confusing the clocks that run your body.
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Your brain has a master clock, set mainly by light. Panda explains that your liver, gut, muscles and most other organs keep clocks of their own, set largely by when you eat. Health suffers, he argues, when those clocks drift out of step with each other.
Panda's lab helped show how light resets the master clock, through a sensor in the eye called melanopsin. It reacts most to bright, bluish light, like daylight. So a bright screen at midnight tells your brain the day hasn't finished yet.
Panda's team had volunteers photograph everything they ate or drank with a phone app. More than half were eating across fifteen hours or more a day. Panda counts anything except water as the start of your eating day, milky coffee included.
Panda calls keeping all your meals to a steady daytime window time-restricted eating, and he's a strong advocate. The mouse results are striking. Trials in people have been more mixed. Anyone with diabetes or on medication should talk to a doctor before changing when they eat.
Many clocks
Every organ in your body runs on its own clock, and they work best when they stay in step.
The mice
Panda's mice ate the same fatty food, but those fed within 8 hours a day stayed lean.
Eating window
Try to eat all your food within 8 to 12 hours of the day, and fast the rest.
Light
Get bright daylight in the day and keep your evenings dim, so your clock knows the time.
Late snacks
A late snack keeps your gut working when it should be resting and repairing.
A story from the book
Panda's team fed two groups of mice the same fatty food. One group could eat at any hour. The other could only eat within a set window each day. Eating about the same calories, the round-the-clock mice grew obese and unwell, while the others stayed far healthier.
One thing to try
Tomorrow, get outside in daylight within an hour of waking, even for a few minutes. Walk part of the way to work, or drink your tea on the doorstep. Panda points out that a cloudy morning outdoors is still far brighter than a lit room.
Knotd has the key ideas from 250+ non-fiction books, each in a few minutes, in plain words. The Circadian Code comes with a Spot the Trap case to make it stick.
Get the whole book on KnotdOpen in the appDoes it matter when you eat? Satchin Panda studies the body's daily rhythms at the Salk Institute in California. The Circadian Code argues that the timing of your meals, sleep and light matters for your health, and that modern life keeps confusing the clocks that run your body.
A clock in every organ; The eye's light meter; The fifteen-hour eating day; The human evidence is mixed.
Tomorrow, get outside in daylight within an hour of waking, even for a few minutes. Walk part of the way to work, or drink your tea on the doorstep. Panda points out that a cloudy morning outdoors is still far brighter than a lit room.
Yes. Knotd has the key ideas from The Circadian Code in a few minutes, in plain words, plus a Spot the Trap case to test them. It's one of 250+ non-fiction books in the app.
