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George comes on a vacation to India from the US. The long journey disturbs his biological system, and he suffers from jet lag. What is the cause of his discomfort?

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Body's biological clock follows a set pattern during the 24 hours called the circadian rhythm. If a person travels through different time zones through long hours of journey, his circadian rhythm gets troubled. As a result, the person suffers from jet lag.

This causes sleep disturbance, bowel habits, anorexia, etc.

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