This allows your body temperature to go down about one degree Fahrenheit, which is necessary for sleeping. He mentions that the doctor (who is a follower of this plan) had the patient wake early to attend a walking group therapy session.

I've read a lot on sleep so I could better fix my schedule, and by extension, on the circadian rhythm which heavily influences it. When they were put under constant darkness without any outside timing cues, they also woke up and went to sleep with clockwork precision, every 23 hours 45 minutes.

Where he diverges from common sense, is when he suggests that you can eat any type of food you want; the time windows when you eat and don't eat are most important to weight loss. We used to believe that our day-night cycles were only guided by the external world: The light in the morning would wake us up, and seeing the moon was our cue to go to sleep.

In fact, I found it quite funny that he mentioned his exact schedule, including wake time, meal times, and bedtimes, and they're almost exactly the same as mine. A healthy lifestyle includes what and when you eat, when and how much you sleep, and when and how often you move. Circadian clocks also regulate the production of antioxidants to neutralize oxidative stress from metabolism. Not immediately but when we get older the body may start to break down showing diseases that are all too common now. When you purchase this title, the accompanying reference material will be available in your Library section along with the audio on our Desktop Site.

tl;dr: circadian clock stuff is good, backing of the theory is bit dubious and the part on nutrition and some things on exercise are oversimplified / unproven / inaccurate. So you are telling me there is way of life where I can eat whatever I like and be healthier than ever?

Once we have a strong foundation then everything else we do will have way more chance of working better! We alter our circadian clocks by eating too often - and eating within 3 hours of bed is particularly problematic.

The author proposes a reduced window of 8h during which you can eat whatever you want (drinking water is fine). And in a way, this makes it an important book, as this is the first one to summarize all the findings regarding circadian clocks (up to this point) in a way, that allows you to get an overview without having to sift through all the relevant papers yourself.