Which hormone signals satiety?

Which hormone signals satiety?

• A. Ghrelin
• B. Serotonin
• C. Leptin
• D. Dopamine

Answer: (C)

Satiety is signaled by hormones that communicate fullness to the brain. Leptin does this by reflecting the body's fat stores: fat cells release more leptin as fat mass increases, and the hormone travels to the hypothalamus to reduce hunger and boost energy use. This makes leptin a key long-term regulator of eating behavior and fullness. Ghrelin, in contrast, triggers hunger and signals the body to seek food. Serotonin is a neurotransmitter that can influence appetite and mood but is not the primary signal for fullness. Dopamine relates to reward and motivation rather than directly signaling fullness.

Satiety is signaled by hormones that communicate fullness to the brain. Leptin does this by reflecting the body's fat stores: fat cells release more leptin as fat mass increases, and the hormone travels to the hypothalamus to reduce hunger and boost energy use. This makes leptin a key long-term regulator of eating behavior and fullness.

Ghrelin, in contrast, triggers hunger and signals the body to seek food. Serotonin is a neurotransmitter that can influence appetite and mood but is not the primary signal for fullness. Dopamine relates to reward and motivation rather than directly signaling fullness.