Biological Explanations for Eating Behaviour

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  • Created by: Amy
  • Created on: 15-01-13 23:10
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  • Biological Explanations for Eating Behaviour
    • Stomach
      • Cannon and Washburn
        • Washburn swallowed inflated balloon
          • inflated & used measure stomach contractions in relation hunger pangs 
            • • Washburn’s hunger pangs correlated w/ stomach contractions
            • Hungry when balloon was flat
            • Suggest presence or absence food in stomach is important signal to brain mechanism of feeding
            • However, people who have part or all of stomach removed because of cancer were still able to control food intake
      • Grehlin
        • Hormon produced by the stomach - proportional to how empty it is
          • Signals hypothalamusto start eating
        • If you inject people with grehlin they increase food intake and body weight
        • Cummings et al
          • BLood grehlin levels changes between meals
          • 6 P's ate lunch then had grehlin levels measured every 5 minutes using blood tests
            • Assessed hunger every 30 minutes. Carried on until they wanted evening meal
            • Grehlin levels fell after lunch after 70 minutes - lowest
              • Then slowly rose til they wanted evening meals
          • 5/6 p's grehlin levels were closely correlated with degree of hunger reported supporting the idea that grehlin is a key appetite signal in humans
    • Leptin
      • signals body to stop eating
    • CCK
      • produced by  small intestine once food has passed through stomach
        • if injected into rats it causes weight loss
          • animals with genetic mutation that eliminated CCK system become obese
    • Hypothalamus
      • Lateral hypothalamus - feeding centre - makes you eat
        • Lesioning the LH in rats caused loss of feeding behaviour - even in the presence of food
      • Ventromedial hypothalmus - safety centre - not hungry
        • Lesioning it - rats over ate and became obese

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