Which factor is NOT a risk for changes in fluid balance in older clients?

Lack of exercise is not typically considered a direct risk factor for changes in fluid balance in older clients compared to the other factors mentioned. As people age, they experience physiological changes, such as a decrease in kidney function and a diminished thirst response, which can significantly affect fluid balance.

Medication use is a notable concern as many older adults are prescribed diuretics, antihypertensives, or other medications that can lead to alterations in fluid status, increasing the risk of dehydration or fluid overload. Emotional illnesses, such as depression or anxiety, can also impact fluid balance, as they may affect an individual's motivation to drink sufficient fluids, potentially leading to dehydration.

In contrast, while lack of exercise can influence overall health and physical well-being, it does not have a direct and immediate impact on the body's ability to maintain fluid balance in the way that age-related physiological changes, medication effects, or emotional states do. Therefore, it is less critical as a risk factor in this context.