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Hunger is the physiological sensation triggered by the need for food. It is typically accompanied by physical symptoms such as stomach contractions and a desire to eat.
Ghrelin is a hormone produced in the stomach that stimulates appetite and plays a role in regulating food intake.
The hypothalamus is a small region of the brain involved in various physiological processes including hunger and satiety regulation.
Leptin is a hormone released by fat cells that helps regulate energy balance by suppressing appetite and promoting feelings of fullness.