Which of the following is a protein that stimulates appetite and decreases energy expenditure?

• A. Leptin
• B. Insulin
• C. Ghrelin
• D. Glucagon

Answer: (C)

Verified step by step guidance

1. Identify the function of each hormone listed in the options: Leptin, Insulin, Ghrelin, and Glucagon.
2. Understand that Leptin is a hormone that decreases appetite and increases energy expenditure.
3. Recognize that Insulin is primarily involved in regulating blood glucose levels and does not directly stimulate appetite.
4. Note that Glucagon is a hormone that raises blood glucose levels and is not directly related to appetite stimulation.
5. Conclude that Ghrelin is the hormone known for stimulating appetite and decreasing energy expenditure, making it the correct answer.