Anorexia often begins with what appears to be harmless dieting or a desire to "eat healthier." Over time, food rules multiply, weight drops, and families find themselves facing a serious illness. If you suspect your teenager may be developing anorexia, knowing what to do next can make a profound difference. While parents often feel pressure to understand why the eating disorder developed, the more urgent task is restoring nutrition and interrupting the illness. Here are four important principles every parent should understand when anorexia enters the picture.