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The woman in this case had cachexia, a metabolic disorder that affects some 9 million people worldwide, including as many as 80% of people with advanced cancer. It typically involves extreme weight- and muscle-loss, makes routine activities difficult and increases the risk of deadly complications such as infections. Adding calories doesn't reverse cachexia, and McClement says that the disorder sometimes provokes extreme reactions from family members because it serves as visual confirmation of their worst fears. "It's a constant reminder that the person is sick and is not going to get better," says McClement.