A 19-year-old girl with a significant weight concern and a military family background might suffer from which disorder?

The correct answer is Anorexia. This disorder is characterized by an intense fear of gaining weight and a distorted body image, which leads individuals to restrict their food intake and engage in excessive weight loss behaviors. Considering the context of a 19-year-old girl with significant weight concerns and a military background, Anorexia may be particularly relevant due to the often demanding and high-stress environment associated with military families. Such environments can contribute to perfectionism, high expectations, and issues related to body image, all of which are risk factors for developing Anorexia.

In contrast, Bulimia, while also related to weight and body image, typically involves cycles of binge eating followed by compensatory behaviors. Major Depressive Disorder, although it can co-occur with eating disorders, does not inherently involve the specific behaviors or attitudes towards food and body that are characteristic of Anorexia. Catatonia, which can manifest in various ways including motor immobility and extreme behavioral changes, is less likely to be relevant in this context given the specific focus on weight concern. Thus, Anorexia stands out as the most fitting disordered eating behavior for this scenario.