"Weight loss, in the context of medicine, health, or physical fitness, refers to a reduction of the total body mass, by a mean loss of fluid, body fat adipose tissue, or lean mass namely bone mineral deposits, muscle, tendon, and other connective tissue Weight loss can either occur unintentionally because of malnourishment or an underlying disease, or from a conscious effort to improve."

"Weight loss in individuals who are overweight or obese can reduce health risks increase fitness and may delay the onset of diabetes It could reduce pain and increase movement in people with osteoarthritis of the knee Weight loss."

"National Health Service and the Dietary Guidelines for Americans, those who achieve and manage a healthy weight do so most successfully by being careful to consume just enough calories to meet their needs, and being physically active."