Be early
Get to the Airport in plenty of time. Check in early and then relax. Getting into an air-conditioned aircraft while you are hot and sweaty can affect your health. Adjust your watch and your mind to the time zone you are flying into.
Drink more water
Your body's need for water increases during a flight. Make sure you drink plenty of water or light fruit juice, but avoid alcohol and caffeine. Remember, your normal requirement is 8-12 large glasses of water a day.
Eat right
Reduce your food intake drastically to rest your digestive system. At 35,000 ft., your digestive system is much less efficient.
Do in-flight exercises
Maintain your circulation by walking around and stretching every 2 hours. Large airplanes have room to walk in. You only need to remain in your seat while the seatbelt sign is lit. As soon as possible after you arrive, do a light 10-minute aerobic workout, or take a brisk walk around the block.
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