What is a primary reason BIA is effective?

Bioelectrical Impedance Analysis (BIA) is effective primarily because it takes into account the differing electrical properties of fat and muscle. Fat tissue has a higher impedance, meaning it does not conduct electricity as well as muscle tissue does. Since muscle is more hydrated and contains more electrolytes, it facilitates electrical flow, resulting in lower resistance compared to fat.

This principle allows BIA to estimate body composition by measuring the resistance encountered by a small electrical current as it passes through the body. The different levels of conductivity between muscle and fat are central to the accuracy of BIA, making this characteristic a primary reason for its effectiveness. This information is crucial in assessing body fat percentage and overall fitness levels.