What is a common sign of dehydration?

Dark yellow urine is a common sign of dehydration due to the concentration of waste products, such as urea, in the urine when the body is not well-hydrated. When fluid intake is insufficient, the kidneys conserve water, leading to more concentrated urine that appears darker in color. This change in urine color serves as a reliable indicator that the body may need additional fluids to maintain proper hydration levels.

In contrast, increased energy levels typically indicate adequate hydration and can be misleading, as dehydration often leads to fatigue. Clear urine generally suggests good hydration, which is the opposite of dehydration. Frequent urination can occur with high fluid intake or certain medical conditions, but it does not specifically indicate dehydration, as the body may also expel excess fluids. Therefore, dark yellow urine stands out as a clear indicator of dehydration, signaling the need for increased fluid consumption.