What hormone is associated with appetite regulation?

• A. Insulin
• B. Ghrelin
• C. Progesterone
• D. Thyroxine

Answer: (B)

Ghrelin is the hormone primarily associated with appetite regulation. It is often referred to as the "hunger hormone" because it is released by the stomach when it is empty and signals the brain to stimulate appetite. Ghrelin levels increase before meals and decrease after eating, thus playing a crucial role in hunger perception and energy balance.

In contrast, insulin is primarily involved in glucose metabolism and regulating blood sugar levels, rather than directly affecting hunger signals. Progesterone is mainly known for its role in the menstrual cycle and pregnancy and does not have a direct function in appetite regulation. Thyroxine, a hormone produced by the thyroid gland, is involved in metabolic rate and energy expenditure but does not directly control appetite like ghrelin does. This makes ghrelin the best choice when focusing on hormones specifically associated with appetite regulation.