# Physiological effects of air travel

> Live situation record from CLSTR: https://clstr.news/situations/physiological-effects-of-air-travel
> Updated: 2026-08-15T06:01:46.000Z. Sources: 4. Developments: 2.

Medical experts and researchers have identified various physiological impacts caused by the environmental conditions of air travel, specifically low humidity and cabin pressure at high altitudes.

Physiological effects include dehydration, swelling in the legs due to immobility, and gas expansion in the intestines leading to bloating. Changes in oxygen and pressure can also cause ear discomfort, fatigue, and altered senses of taste and smell. Dr. Roger Henderson notes that approximately one in three in-flight medical emergencies involves fainting, often triggered by sudden drops in blood pressure after prolonged sitting.

To mitigate these risks, health recommendations suggest maintaining hydration and avoiding specific beverages. Experts advise limiting alcohol and caffeine due to their diuretic effects, which can increase dehydration and fatigue, as well as avoiding sugary sodas that may cause abdominal bloating and glucose spikes.

## Timeline

### 2026-08-15: Physiological effects of air travel on the human body

Air travel affects the body through cabin pressure and low humidity, causing issues like bloating, dehydration, and altered taste. Experts advise hydration to prevent fatigue and fainting.

2 sources. https://clstr.news/cluster/physiological-effects-of-air-travel-on-the-human-body

### 2026-08-09: Health recommendations for beverage consumption during air travel

To prevent dehydration and discomfort during flights, experts advise limiting alcohol, caffeine, and sugary sodas, recommending water or herbal infusions instead.

2 sources. https://clstr.news/cluster/health-recommendations-for-beverage-consumption-during-air-travel

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Cite as: Physiological effects of air travel. CLSTR, https://clstr.news/situations/physiological-effects-of-air-travel