BMI has several limitations in assessing health. It doesn't account for muscle mass, which can lead to misclassifying muscular individuals as overweight or obese. Additionally, BMI fails to consider fat distribution, which is crucial since fat around the abdomen poses a greater health risk than fat in other areas. Other factors such as age, gender, and ethnicity can also influence health, but BMI does not factor these in. Therefore, BMI should be regarded as a preliminary tool rather than a definitive measure of health.