Living on the wrong end of a time zone could hurt your health.

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When morning starts before sunrise, circadian rhythms suffer.

Time zones have winners and losers.
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▼ The sun both rises and sets later in the western parts of time zones, by about an hour at the extremes. If sunrise in Nashville, Tennessee is 6:30 a.m., it’s about 7:30 a.m. in Amarillo, Texas. Similarly, if sunset in Nashville is 8 p.m., it’s about 9 p.m. in Amarillo. Yet both are in the Central time zone.
This means that many people in Amarillo must get up before sunrise to get to work on time compared to people in Nashville, who can get up after sunrise. As I reported previously, two studies  have shown that breast cancer risk is higherin the western parts of time zones; the first was conducted in European Russia and the second in the U.S. The authors of these two studies suggest it is the chronic disruption of circadian  rhythmsfrom getting up in the  dark that may be the culprit.
However, the good part to living in the west is that there is an hour more daylight after work in Amarillo than in Nashville. That’s been part of the campaign for a  permanent daylight saving time—an hour more fun in the sun in the evening under DST.
However, a buzzkill new study has just reported health problems with a later clock time of sunset as well, and it’s not just breast cancer.
Social jet lag
Writing in theJournal of Health Economics, authors Osea Giuntella of the University of Pittsburgh and Fabrizio Mazzonna of Università della Svizzera Italiana took an innovative slant on the effect of  position in a time zoneon health and economics. They were interested in something called “ social jet lag.”
The idea is that given the constraints of modern life, most people are out of sync with their natural circadian rhythms, which should follow the sun. Instead, we use electric light to synchronize most of our societal activities regardless of where the sun is at in its course through the heavens.
The conflict is that the primordial cycle of light and dark from the sun is deeply embeddedwithin our evolutionary past as coded in our DNA; we have a “built-in”  biological time for body  temperature, hormone levels,  sleep, and much more, that cycles  very close to 24 hours.
Modern society requires synchronization in such things as school start times, work times and television watching times. All of these can desynchronize our social activity from our biological time. There is mounting evidence that chronic circadian rhythm  disruptionleads to several serious diseases as well as depression and mood disorders. On a societal level, the economic impact may also be large.
Lefties of a boundary healthier than righties? (▪ ▪ ▪)

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