Hunger Motivation Jorge Duc
Factors for hunger • Biological Factors: • Hypothalamus • Glucose Levels • Appetite hormones • Psychological Factors: • Sight and smell of food • Mood • Internal and External cues • Culture and Background
Biological Factors • 2 Parts of the Hypothalamus • Lateral Hypothalamus-When stimulated, causes you to feel hungry. • Ventromedial Hypothalamus-When stimulated, causes you to feel full. • Example of a rat with no ventromedial hypothalamus. • Set point theory. • Glucose levels.
Appetite Hormones • Insulin: Controls blood glucose, secreted by the pancreas. • Leptin: When abundant it causes the brain to increase metabolism and decrease hunger. Protein secreted by fat cells. • Orexin: Hormone that is secreted by the hypothalamus that triggers hunger. • Ghrelin: Secreted when your stomach is empty sending hunger signals to the brain. • PYY: Digestive tract hormone that sends “I’m not hungry” signals to the brain.
Psychological Factors • External: Sight, smell, thought of food, and mood. • Internal: No presentation of food. Internal hunger cues. • Time since our last meal. • Food aversion(Garcia effect) • Culture • Hunger goes beyond the body and gets influenced a lot by your heritage and what your parents feed you(nurture)