Answer:
Hank has a problem with the pituitary gland.
Explanation:
The pituitary gland is a small gland that resembles a pea located in the head. Its role is regulating important body functions and wellbeing of people. It is called the master gland of the body because it controls activities of other glands which secretes hormones.
Pituitary tumors develop in the pituitary gland which causes the overproduction of some hormones. Pituitary tumors results in fatigue, weight loss or weight gain or sometimes blindness. Hank has a problem with his pituitary gland which is causing him to be gaining weight even though he's on diet.
