Reduction of overall total mass of a body due to loss of body fat or fluid is a precise definition that comes under the context of medicine.

Any connective tissue, muscles or tendons that a body loses due to weight loss also included in this category. Weight loss can be conscious or unconscious.Unconciously a body loss weight due to a long term disease or intentionally due to personal efforts, striving for a better attractive physique. Excessive weight loss is also hazardous as it affects one’s physique greatly. Read more »