What is the formula to determine total body mass?

Total body mass is calculated by summing all components that contribute to an individual's weight, specifically fat mass, lean mass, and bone mass. Lean mass encompasses the weight of muscles, organs, and other non-fat tissues in the body, while bone mass refers to the weight of the skeletal system.

The correct answer is comprehensive in that it recognizes that total body mass should reflect all these significant components. By including fat mass, lean mass, and bone mass, the formula provides a complete picture of body weight composition, which is crucial for understanding health, nutrition, and obesity management.

Other answer choices do not encompass all necessary elements for calculating total body mass. For instance, combining fat mass with lean mass excludes bone mass, which is a critical part of total body weight. Therefore, it's essential to include all three components (fat, lean, and bone mass) for an accurate measurement of total body mass.