True or False: Bioelectrical impedance is affected by hydration status.

Bioelectrical impedance analysis (BIA) measures body composition, specifically the proportion of lean mass to fat mass, by passing a small electrical current through the body. The resistance encountered by the electrical current is influenced by the body's water content because lean mass, which contains more water compared to fat mass, conducts electricity better.

When hydration status changes—whether due to overhydration or dehydration—it can significantly alter the readings produced by BIA. For example, dehydration may result in higher resistance, suggesting a lower amount of lean body mass than what truly exists. Conversely, excess body water can lead to lower resistance, indicating a higher amount of lean mass. Therefore, hydration status is a critical factor that can impact the accuracy and reliability of bioelectrical impedance measurements, supporting the assertion that the statement is true.

This is essential to understand for anyone conducting or interpreting these assessments, as accurate hydration status should be taken into account to ensure proper evaluation of body composition.