Lean body mass (LBM) refers to the weight of a person's body minus the weight of their fat mass. It includes muscles, bones, organs, and tissues that make up the body's overall structure and function. LBM is an important indicator of a person's overall health and fitness, as it is closely related to metabolic rate, physical performance, and overall body composition. Research in the area of lean body mass focuses on understanding the factors that influence LBM, such as diet, exercise, genetics, and age. Researchers also study how changes in LBM can impact various health outcomes, such as risk of chronic diseases, physical function, and overall quality of life. Overall, research in the area of lean body mass aims to provide insights into how individuals can optimize their muscle mass, improve their physical performance, and maintain overall health and wellness.