Weight Loss/Gain

In medical science, health, or physical fitness, weight loss refers to a reduction in total body mass caused by a mean loss of fluid, body fat or adipose tissue, or lean mass, namely bone mineral deposits, muscle, tendon, and other connective tissue. Weight loss can occur unintentionally as a result of malnourishment or an underlying disease, or it can occur as a result of a conscious effort to improve an actual or perceived overweight or obese state.

Weight gain is defined as an increase in body weight. This can be due to an increase in muscle mass, fat deposits, excess fluids like water, or other factors. Weight gain can be a sign of a serious medical problem.