Neural Mechanisms of Controlling Eating behaviour

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1. Issue of the Glucostat theory

  • Cannot be considered adaptive like it suggests it is as it should anticipate low levels of blood sugars instead of waiting till levels of blood sugar are low
  • It's too simplistic to suggest that this is how blood glucose is controlled
  • It doesn't include insulin and glucagon's part in regulating blood sugar levels and therefore control of eating behaviour
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2. What did Yang et al. find?

  • When Neuropeptide Y is injected into the hypothalmus of rats it causes overeating
  • when rats were injected with leptin they lost weight
  • Neuropeptide Y is produced by the hypothalamus leading to overeating then when abdominal fat is gained, the fat produces neuropeptide Y leading to more overeating
  • When additional neuropeptide Y was injected into rat's hypothalamus it led to obesity

3. What did Lutter et al. find?

  • The hormone gherlin produced in response to stress also increases appetite
  • Neuropeptide Y is produced by the hypothalamus leading to overeating then when abdominal fat is gained, the fat produces neuropeptide Y leading to more overeating
  • When the LH was damaged it caused rats to stop eating but when it was stimulated it caused rats to overeat

4. Which study found that when the LH was damaged it caused rats to stop eating but when it was stimulated it caused rats to overeat?

  • Heatherington and Ranson
  • Lutter et al.
  • Zhang et al.

5. Which study found that when rats were injected with leptin they lost weight?

  • Zhang et al.
  • Yang et al.
  • Heatherington and Ranson
  • Lutter et al.

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