Which physiological change could indicate kidney dysfunction?

Decreased urine output is a significant physiological change that can indicate kidney dysfunction. The kidneys play a crucial role in regulating fluid balance and filtering waste from the body. When kidney function declines, they may struggle to filter blood effectively, leading to reduced urine production. This condition, known as oliguria, can signal that the kidneys are not functioning correctly and may be a sign of acute or chronic kidney injury.

In contrast, increased thirst may indicate dehydration or other issues, but it does not directly reflect kidney dysfunction. Enhanced energy levels are generally not associated with kidney problems, as kidney dysfunction often leads to fatigue due to waste accumulation in the body. Reduced appetite can occur for various reasons, including but not limited to kidney issues, making it a less direct indicator of kidney function. Therefore, decreased urine output stands out as a clear and direct sign of potential kidney dysfunction.