If ghrelin is the hunger hormone, what physiological state is associated with its increased secretion?

• A. Satiety
• B. Dehydration
• C. Fasting
• D. Hydration

Answer: (C)

Ghrelin is known as the hunger hormone primarily because its secretion is tightly linked to the body's energy balance and hunger signals. Its levels increase in anticipation of fasting and decrease after food consumption. When the body is in a fasting state, it experiences a drop in energy availability, which stimulates the stomach to release ghrelin. This hormone then signals the brain to promote feelings of hunger, encouraging food intake and energy replenishment.

In contrast, during periods of satiety, when the body has received sufficient nutrients, ghrelin levels decrease, reducing the craving for food. Dehydration and hydration are not directly tied to ghrelin secretion in the same manner as fasting, as ghrelin's primary role focuses on energy balance rather than fluid balance. Therefore, fasting is the physiological state associated with an increase in ghrelin secretion, aligning with its function of stimulating hunger and preparing the body to seek nourishment.