Unexplained weight loss is a noticeable drop in body weight that occurs even if the person is not trying to lose weight. The weight loss does not come about because of diet, exercise or lifestyle changes. Weight loss of 10 pounds or more, or five percent of body weight, over a period of 6 to 12 months is considered “unexplained.” Unexplained weight loss can be a symptom of a serious condition or illness. For this reason, it is important to seek medical attention if you (or a family member) have weight loss that cannot be explained. Proven weight loss