Which Statement About the Hormone Leptin is True

Question

Which statement about the hormone leptin is true?
A) It is secreted by the stomach.
B) It produces the sensation of hunger.
C) Leptin secretions decrease for about 3 hours after a meal.
D) Leptin levels are higher in people who are overweight.

Accepted Answer

Leptin is secreted by fat cells and its levels are generally higher in people who are overweight or obese. It functions to regulate appetite and metabolism, inhibiting hunger and promoting energy expenditure. The statement that leptin secretions decrease for about 3 hours after a meal is incorrect - in fact, levels typically rise after eating as a result of the increase in insulin and glucose. The statement that leptin produces the sensation of hunger is also incorrect - instead, it works to suppress hunger and promote feelings of fullness. Finally, leptin is not secreted by the stomach, but rather by adipose tissue.