Combat Dehydration in the Air

The Science of Dehydration While Flying

What You Need to Know

Flying can be an exciting adventure, but it often comes with an unwelcome side effect: dehydration. Understanding why dehydration occurs and how to combat it can make your travel experience much more comfortable.

Why Does Dehydration Happen on Flights?

One of the primary reasons for dehydration during flights is the cabin environment. Airplane cabins have very low humidity levels, often below 20%. This is significantly lower than typical indoor humidity levels of 30-65%. The air outside at cruising altitudes is extremely cold and dry, and when it's brought into the cabin and pressurized, it remains very low in moisture.

So How Do We Lose Fluid?

The dry cabin air increases the rate of moisture loss from your respiratory system with every breath you take. Low humidity also accelerates the evaporation of moisture from your skin. People also may drink less water to avoid frequent restroom visits. Others might enjoy some alcohol and or caffeine. These beverages are often consumed during flights and have diuretic effects, which can increase dehydration.

Your body might respond to the low pressure and humidity by increasing urine output, further depleting your water levels. Dehydration can lead to an imbalance of electrolytes, which are crucial for muscle function, nerve signaling, and overall cellular function.

Dehydration can impair cognitive functions, making it harder to concentrate and make decisions. Symptoms such as dry mouth, headaches, and fatigue are common and can make the flight uncomfortable. Dehydration can increase blood viscosity, raising the risk of blood clots, especially on long flights.

How to Stay Hydrated While Flying

Aim to drink about 16 ounces of water before your flight and then every hour in the air. This helps offset the moisture loss from your body. Try to reduce your intake of alcohol and caffeine, as these can increase dehydration. Use skin moisturizers to combat dryness. Consider adding a packet or 2 (depending on length of flight) of Replenish to your water to maintain a healthy electrolyte balance and prevent excessive dehydration.

Safe travels and happy flying!

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