A healthcare professional can diagnose an anorexic patient as one unrealistic about her weight and shape despite unusual thinness. The woman will appear very thin and have a troubling concern about weight gain. To obtain and maintain her extremely thin state involves unnatural and potentially dangerous methods of eating and weight and potentially dangerous methods of eating and weight loss, such as starvation, excessive exercise, food restrictions, and purgatives. A history of amenorrhea, infertility, recurrent miscarriage, or poor pregnancy results can be a red flag an eating disorder.