What is the function of leptin in the body?

• A. To increase metabolism
• B. To inhibit hunger and regulate energy balance
• C. To promote fat storage
• D. To enhance nutrient absorption

Answer: (B)

Leptin is an important hormone primarily produced by adipose (fat) tissue, and its main function is to inhibit hunger and regulate energy balance in the body. When fat stores increase, leptin levels rise, signaling to the brain that the body has enough energy reserves. This process helps to suppress appetite, therefore promoting a decrease in food intake. Additionally, elevated leptin levels can increase energy expenditure by stimulating metabolic processes.

The interaction between leptin and the central nervous system, particularly the hypothalamus, plays a critical role in maintaining energy homeostasis. The regulation of hunger and satiety by leptin helps to ensure that the body can balance energy intake with energy expenditure effectively.

While metabolism, fat storage, and nutrient absorption are important processes, they are not directly influenced by leptin in the same manner as hunger and energy balance. Leptin acts more as a signal of energy sufficiency rather than a direct enhancer of metabolic rate or nutrient absorption. Thus, the correct understanding of leptin's function highlights its role in appetite regulation and energy homeostasis.