Ghrelin is a hormone produced by the stomach and small intestine that signals hunger to the brain.

Homeostasis is the body's ability to maintain a stable internal environment despite changes in the external environment.

Appetite is the desire to eat, while hunger is the physical need to eat.

Bulimia Nervosa is an eating disorder characterized by binge eating followed by purging, which can include vomiting, excessive exercise, or laxative use.

Leptin is a hormone produced by fat cells that signals satiety to the brain.

Circadian Rhythm is the body's natural sleep-wake cycle, which is influenced by light and darkness.

Genetics is not a factor that directly influences hunger.

Anorexia Nervosa is an eating disorder characterized by an intense fear of gaining weight, leading to severe food restriction and weight loss.

Obesity is not an eating disorder, but rather a condition characterized by excessive body fat.

Pica is an eating disorder characterized by a persistent desire to eat non-food items, such as dirt, clay, or paper.

Genetics is not a factor that directly influences eating behavior.

Thermoregulation is the body's ability to regulate its internal temperature.

Appetite is the desire to eat, while hunger is the physical need to eat.

Bulimia Nervosa is an eating disorder characterized by binge eating followed by purging, which can include vomiting, excessive exercise, or laxative use.

Leptin is a hormone produced by fat cells that signals satiety to the brain.