Starving may fend off jet lag

Humans have second internal clocks that take over their circadian clocks when deprived of food.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 a second clock takes over when food is scarce, and manipulating this clock might help travelers adjust to new time zones, they said."A period of fasting with no food at all for about 16 hours is enough to engage this new clock," said Dr. Clifford Saper of Harvard Medical School, whose study appears in the journal Science.He said a person from the United States traveling to Japan must adjust to a 11-hour time change.

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