Pre-flight fasting could prevent jet lag

Scientists say that normally the body's natural circadian clock in the brain dictates when to wake, eat and sleep, all in response to light.

But it seems that a second clock takes over when food is scarce. Manipulating this clock might help travelers adjust to new time zones.

Researchers reporting in the journal science say a period of fasting with no food at all for about 16-hours is enough to engage this new clock.

They say these same clock genes are known to be in all mammals including humans so it may be worth a try.

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