The human body loses up to 8% water on a flight!

Air travel has become an integral part of modern life, allowing us to traverse long distances in just a matter of hours. While we often focus on the convenience and excitement of being in an aircraft, there’s an intriguing aspect that many are unaware of. It is the fact that the body loses approximately eight per cent of water during a typical flight.

Let’s dive into the significant reasons behind this phenomenon and explore the research that sheds light on it.

The dehydration conundrum

Low Humidity in the Cabin: One of the primary reasons for dehydration during flights is the low humidity in the cabin. Commercial airplanes typically maintain humidity levels between 10 per cent and 20 per cent, far lower than the comfortable 30-60 per cent range we experience on the ground. This leads to increased moisture loss from the body.

Altitude Effect: As you ascend to cruising altitudes, the reduced air pressure makes the body work harder to absorb oxygen. This physiological response includes an increase in the rate of respiration, which in turn leads to a more significant loss of moisture with each breath.

Limited Mobility: Passengers often remain seated for extended periods during flights which can reduce blood circulation and promote water retention in tissues, causing dehydration.

The research behind

Scientists have conducted several studies to better understand the extent of water loss during flights and its potential health implications. A study published in the Aerospace Medicine and Human Performance journal in 2015 assessed the hydration status of 48 passengers on a 10-hour flight. The research found that the passengers lost an average of 1.5 litres of water during the flight, equivalent to approximately eight per cent of their total body water.

Research has also explored the health consequences of in-flight dehydration. These include dry skin, dry eyes, nasal discomfort, fatigue, and an increased risk of blood clots. For individuals with pre-existing medical conditions or those who are particularly sensitive to dehydration, these effects can be more pronounced. Dehydration can also exacerbate the symptoms of jet lag. Studies suggest that proper hydration before, during, and after a flight can help mitigate the effects of jet lag.

Tips to stay hydrated while flying

Drink Water: Stay hydrated by drinking water throughout the flight. Avoid excessive caffeine and alcohol which can contribute to dehydration.

Use Moisturisers: Apply lotion to your skin and saline nasal sprays to keep your nasal passages hydrated.

Move Regularly: Stand up, stretch, and walk around the cabin to promote circulation.

Choose Hydrating Foods: Opt for fruits and vegetables, which have high water content, in your in-flight meals.

Consider a Humidifying Device: Some travelers prefer to carry portable humidifiers to increase the humidity around their seats.

So, the next time you’re on an airplane, don’t forget to drink that extra glass of water to keep yourself feeling your best even at 30,000 feet!