Body Composition Analysis When you weigh yourself, have you thought about what exactly comprises your weight? Is it mostly water, fats, or muscles? Two people of the same sex and body weight may look completely different from each other because of their different body compositions. Body composition analysis is a method of defining what your body is made of. It consists of fat, proteins, minerals, and water. It measures weight more accurately than BMI. Body composition analysis can accurately show changes in fat mass, muscle mass, and body fat percentage. BMI and weight do not differentiate between muscle and fat. You may be very muscular, and as we know that muscles are denser and heavier, the scale may show that you are overweight and unhealthy! Knowing your body composition can help you determine the general state of your health. Even if you appear to be healthy on the outside and weigh in at a seemingly normal weight on the scale, you may still have an unhealthy or altered body composition. Body composition can help you identify areas to work on to improve your overall health and wellness.