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 an actual or perceived [overweight] or [obese] state. “Unexplained” weight loss that is not caused by reduction in calorific intake or exercise is called [cachexia]and may be a symptom of a serious [medical condition] Intentional weight loss is commonly referred to as slimming .
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