Final answer:
BMI is a reliable indicator of body fat but does not measure it directly. It calculates an estimation from weight and height, with some limitations to consider.
Step-by-step explanation:
The correct statement about Body Mass Index (BMI) is that it is a reliable indicator of body fat. BMI does not measure body fat directly but rather uses a person's weight and height to calculate an estimation. Even though it is widely used, BMI has limitations and can sometimes be misleading. For example, it does not take into account muscle mass, which weighs more than fat, potentially categorizing a muscular person as overweight or obese. Additionally, it does not account for fat distribution, which is an important factor in assessing health risks. Therefore, while BMI is a useful and inexpensive screening tool, it should be supplemented with other measurements for a more accurate assessment of body fat and health risks.