Final answer:
The symptoms of weight loss, semistarvation, amenorrhea, and an alteration of body image are related to anorexia nervosa, a severe eating disorder with significant health risks.
Step-by-step explanation:
The symptoms described in the question—weight loss, semistarvation, amenorrhea, and an alteration of body image—are characteristic of anorexia nervosa. Anorexia nervosa is a serious eating disorder where individuals restrict their food intake to the point of starvation, which results in extreme weight loss and a distorted perception of their own body weight and shape. This condition can lead to a multitude of serious health risks, such as loss of bone mass, weakening of the heart, low heart rate and blood pressure, and in severe cases, amenorrhea or even heart failure, which can be fatal.