What behavior could increase the risk of heat stress before flying?

Intentionally restricting fluids prior to flight can significantly increase the risk of heat stress for several reasons. Adequate hydration is essential for maintaining the body’s ability to regulate temperature, especially in a hot environment. When fluids are restricted, the body's capacity to cool itself through sweating is diminished, leading to an increased likelihood of heat-related illnesses such as heat exhaustion or heat stroke. This is particularly crucial in aviation, where pilots may encounter high temperatures in the cockpit or during ground operations.

In contrast, drinking plenty of water, wearing light loose clothing, and allowing time for your body to acclimatize are all proactive behaviors that help to minimize the risk of heat stress. Drinking water helps replenish lost fluids and maintain optimal hydration levels, while light, breathable clothing enhances cooling through evaporation. Acclimatization allows the body to adjust to higher temperatures gradually, improving its tolerance and thermoregulation capabilities. Therefore, restricting fluid intake is counterproductive and places individuals at a greater risk of overheating and its associated dangers before flying.