What is the primary function of lipotropins?

• A. To stimulate protein synthesis
• B. To promote fat breakdown
• C. To regulate blood glucose levels
• D. To enhance immunity

Answer: (B)

Lipotropins primarily function to promote fat breakdown, distinguishing them from hormones that regulate protein synthesis, blood glucose levels, or immune response. Produced by the anterior pituitary gland, these hormones play a crucial role in mobilizing fat stores for energy utilization, particularly during times of fasting or increased energy demand. When lipotropins are released into the bloodstream, they stimulate the action of lipase, an enzyme responsible for the hydrolysis of triglycerides stored in adipose tissue. This biochemical process releases free fatty acids, which can then be used by the body for energy. Therefore, the correct answer highlights the essential role of lipotropins in lipid metabolism and energy production.