Hunger and eating Flashcards
role of stomach
increased pressure reduces hunger
contracts when hungry
but people without stomachs still get hungry!
role of small intestine?
cells lining it send signals to brain about need to eat
role of gut bacteria
generate chemicals in response to food
role of insulin
increased with increased blood glucose
role of leptin
increased fat supply produces leptin which decreases food intake.
important areas of the hypothalamus
ventromedial nucleus
lateral hypothalamus
role of ventromedial nucleus?
stimulated - dont need to eat
role of lateral hypothalamus
stimulated - need to eat.
describe set point theory
ventromedial nucleus and lateral hypothalamus work together to create a set point (homeostasis) for food intake
limitation of set point theory
too simplistic
role o paraventricular nucleus?
stimulates - dont need to eat
role of neuropeptide Y
stimulates carb eating
role of serotonin
suppresses carb eating
role of galanin?
increases cravings for high fat oods
role of enteristatin?
decreases cravings for high fat foods
role of endocannabinoids
stimulates eating, especially of tasty foods
role of peptide YY3-36
feelings of fullness, reduces appetite
role of learning?
if you assoicate an event with eating, then you’ll probably eat when doing the event next
role of culture?
different cultures have different foods and portion sizes
role of social factors?
usually eat 65-75% more when eating with others
what is specific hunger
hunger for specific foods
what is flavour
combination of a food’s taste and smell.
what is appetite
motivation to seek foods pleasures
describe body weight for obesity and anorexia nervosa
obseity: BMI > 30
anorexia: BMI in bottom 15th %ile.
