Eat fruits and raw vegetables

Instead of reaching for processed snack food, Guilfoyle suggests something healthier. “Water-based foods, like fruits and raw vegetables, will not only keep you hydrated and prevent puffiness, but will also give you the added boost of important antioxidants, fibre, and other nutrients,” she says.
Check out these sneaky ways you might be making yourself dehydrated.
Get – or stay – in shape

This is good advice regardless of whether or not you’re getting on an aeroplane, but Guilfoyle says that exercising regularly can help you stay healthy when you fly. “Maintaining a healthy lifestyle is extremely important in order to help cope with the physical demands of flying and constant change in time zones,” she explains. “We regularly experience body clock changes, irregular sleeping patterns, and long haul flying which can disrupt our systems. As a result, a regular dose of good nutrition and consistent exercise helps our bodies remain at their optimum levels.”
But don’t exercise right after a flight

Though it may seem like a good idea to hit the gym as soon as you reach your destination, flight attendant Sophie Jones says that it’s actually not. “There’s no point pushing your body to work out when it hasn’t had enough rest, rehydration, and time to acclimatise itself to a new time zone,” she told British Elle.