Answer:
Hyperthyroidism
Substance abuse
Step-by-step explanation:
Hyperthyroidism is the situation in the body when the production of thyroxine hormone is made in huge quantities. The metabolism of the body is accelerated and because of this reason the body fails in gaining weight even after a good consumption of food.
In the given situation, Mayumi's psychological symptoms of hyperthyroidism and substance abuse needs to be examined. The weight loss even after a good consumption of food is evident of such an issue.