What is a common symptom of dehydration?

Fatigue is a common symptom of dehydration due to the body’s reliance on adequate fluid levels to maintain its various functions. When dehydrated, the body's overall performance diminishes as essential biochemical processes struggle without sufficient water. This leads to feelings of tiredness and a decrease in energy levels. Additionally, dehydration can disrupt the balance of electrolytes, which are important for muscle function and energy production, further contributing to feelings of fatigue.

In contrast, the other options do not align with the physiological impacts of dehydration. For example, increased appetite typically does not occur with dehydration; instead, lack of fluids can often lead to a decreased sensation of hunger. Heightened focus and improved digestion are also unlikely, as dehydration can impair cognitive function and slow down metabolic processes, leading to challenges in maintaining focus and effective digestion.