The body measurement often used to assess obesity risk is the body mass index (BMI). BMI is a simple calculation using an individual’s weight and height to categorize them into underweight, normal weight, overweight, or obese. While it provides quick insight into potential health risks, it's essential to consider other factors such as muscle mass and distribution of fat. A comprehensive assessment includes waist circumference and body composition to evaluate obesity risk more effectively and offer tailored health recommendations.