Jet lag can really eat into your vacation time especially if you can only get away for a short break. This article suggests that simply by not eating during the flight you should be able to rapidly adjust to a new time zone. Studies carried out on mice found that the brain has two internal clocks, one activated by light and the other activated by meal times. Apparently the daylight clock usually takes precedence so we are more sleepy at night but travelling across time zones sends this out of synch and causes jet lag. With mice, fasting means that they will forage for food outside of daylight hours. Similarly the problem of jet lag can be overcome by fasting for the plane journey, up to around 16 hours and eating when you land, helping your body adjust more quickly. Having not tried it I'm skeptical but its worth a try, plane food is usually awful anyway.