Which observation could indicate a change in a client's health status?

A sudden change in appetite can be a significant indicator of a shift in a client's health status. Changes in eating habits can often signal various underlying health issues, such as illness, emotional distress, or side effects from medications. Monitoring appetite can provide healthcare providers with critical insights into the overall well-being of a client.

In contrast, a client's favorite book, the weather during a visit, or their preferred activities are more situational observations that do not directly relate to their physical or mental health. While these factors can contribute to a client's quality of life, they do not serve as reliable indicators of health changes. Therefore, recognizing alterations in appetite is essential for detecting potential health issues and responding appropriately.