Biological Explanations of Anorexia Nervosa

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Created Jan 14, 2013
by
char1410

 

 
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1
Anorexia
Description
 
Less than 85% below normal body weight
Failure to lose weight leads to anxiety
Body...
2
Genetic
Description
 
DNA inherited from biological parents
Affects approximately 0.5-1% of population
Families...
3
Genetic
Holland et al (1984)
 
55% MZ twins concordance rate much higher than DZ twins 7%
4
Genetic
Evaluation
 
Concordance rate not 100% - external factors
5
Neurological Explanations
Description
 
Neurotransmitter serotonin may be linked to AN
Linked to depression and OCD
Studies...
6
Neurological Explanations
Kaye et al (2001)
 
PET scans of brain show fewer serotonin receptors in brains of people with AN
7
Neurological Explanations
Evaluation
 
Serotonin levels cause or effect?
Low level of receptors could be long term complication...
8
Evolutionary Explanation
Description
 
Adapt to flee famine hypothesis
Anorexia behaviour adaptive 2 million years ago
AN...
9
Evolutionary Explanation
Evaluation
 
No direct evidence
Refusal of food = death
One person with anorexia may be beneficial...
10
Biological Explanations of Anorexia Nervosa
Issues and Debates
 
Psychology as a science - unfalsifiable
Reductionist - Simplify complex human behaviour


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