What is a physiological impact of dehydration during flight?

Dehydration during flight can significantly affect physiological functions, leading to increased fatigue. When the body is dehydrated, it struggles to maintain its normal fluid balance, which can impair numerous bodily processes. Key systems that are affected include cardiovascular function and thermoregulation, both of which can lead to a decrease in overall energy levels and increased feelings of tiredness.

As the body loses water, blood volume decreases, putting extra strain on the heart to pump blood efficiently. Additionally, dehydration can lead to decreased cognitive function and workout performance, both contributing to a sensation of fatigue.

In contrast, increased energy levels, enhanced oxygen transport, and heightened awareness are typically associated with adequate hydration and physiological readiness, rather than the effects of dehydration. Thus, fatigue stands out as the correct physiological impact of dehydration that can occur during flight.