Class Notes (839,189)
Canada (511,223)
Psychology (2,716)
PSYC 3403 (166)
Lecture 10

Lecture 10.docx

9 Pages
56 Views

Department
Psychology
Course Code
PSYC 3403
Professor
Tarry Ahuja

This preview shows pages 1,2 and half of page 3. Sign up to view the full 9 pages of the document.
Description
Lecture 10 Overview - Why do we eat? - Mechanisms behind food regulation - Physiological effects - Model of food addiction - Prevalence Why do we eat? - Factors that mediate food intake: • Homeostasis (energy demands) (body’s basic needs) • Emotional state (stress, boredom) • Hedonism (pleasure) Why do we eat? - Simple biological model - Body has humoral signals from body to hypothalamus that you are hungry, and initiate cascade of events to make you seek food - Many triggers, such as seeing friends eating and drinking Why do we eat? - Hunger-stimulating GI peptides • Ghrelin (stomach, pancreas)  Levels increase before food consumption  Levels are lower in obese individuals  Sleep can influence ghrelin levels  Activates a portion of the dopamine reward pathway - Adiposity signals- satiety signals • Hormones:  Leptin (adipose)  Off switch. Tells you that you have had enough  Insulin (pancreas)  Cholecystokinin (CCK) (small intestine) Why do we eat? - Mechanism of action for leptin at hypothalamus: • Antagonizing the effects of neuropeptide Y (stimulant) • Antagonizing the effects of anandamide • Promote synthesis of -MSH (appetite suppressant) - Mechanism of action for insulin: • Causes cells to take up glucose from blood • Stops the use of fat as an energy source by inhibiting the release of glucagon • When control of insulin levels fails, patients can develop diabetes mellitus Why do we eat? - Triggers that stimulate hunger are cyclical Why do we eat? - Hypothalamus- primary regulatory center for food intake and body weight • Mice were very obese • Helped in the discovery of leptin • Administration of leptin reversed the effect Dual-center hypothesis **KNOW THIS** - The hypothalamus has two distinct regions: • Ventromedial hypothalamus (deals with satiety, aka OFF switch) • Lateral hypothalamus (deals with hunger, aka ON switch) - Each region regulates the opposing action • Hunger vs. satiet
More Less
Unlock Document

Only pages 1,2 and half of page 3 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit