Which of the following is a common sign of dehydration?

A common sign of dehydration is a dry mouth, which occurs when the body does not have enough fluids to maintain normal physiological functions. Saliva production decreases when the body is dehydrated, leading to a sensation of dryness in the mouth. This can also be accompanied by symptoms such as thirst, dry skin, and fatigue, which are all indicators that the body needs more hydration.

In contrast, increased appetite is not typically associated with dehydration; in fact, people may experience reduced hunger when dehydrated. Frequent urination is generally an indicator of proper hydration or possible overhydration rather than dehydration. Rapid muscle gain is unrelated to hydration status and is more connected to factors such as diet, exercise, and genetics. Understanding these signs can help individuals recognize dehydration and the need for increased fluid intake to support overall health and fitness.