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Biological Explanations of Obesity
Description
A-Levels Psychology Mind Map on Biological Explanations of Obesity, created by cameron9hubbard on 21/11/2013.
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psychology
psychology
a-levels
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cameron9hubbard
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cameron9hubbard
almost 11 years ago
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Resource summary
Biological Explanations of Obesity
Stunkard et al (1986)
AO1
540 Adult Adoptees from Denmark
Weight was compared with that of biological and adoptive parents
Split into 4 weight classes
Thin
Median
Overweight
Obese
AO2
Strong relationship between weight of adoptees and biological parents
No relationship between weight of adopteesd and their adoptive parents in any weight class
Therefore, genetic influences have an important role in determining adult weight, whilst environment has little effect
AO3
Supported by other biological vs adoptive relative research and by some twin studies
Too reductionist as it says that genetics alone are responsible for obesity
All participants from Denmark, so can't be generalised.
Wardle et al (2008)
AO1
Analysed 5092 twin pairs aged 8 - 11.
Compared in terms of BMI and waist circumference.
AO2
Heritability figure of 77%
Relatively small environmental factor
Environmental factors were 50% shared (same home, parents), 50% non-shared.
AO3
Limited age range - can apply to pediatric obesity but not in adults
Large sample size (10184), so more reliable and generalisable
Sample is only from UK, so cannot generalised to other cultures
Reductionist, suggests that genes play the majority of the role in obesity, and there is very little else that affects
Deterministic, suggests that we do not have free will over whether we get obese or not, is all decided by genes + environment
Frayling et al (2007)
AO1
Researched FTO (fat mass and obesity) gene
AO2
People with two copies of this genes had a 70% increased risk of obesity
People with a single copy had a 30% increased risk
AO3
Deterministic - suggested that genes cause us to be obese, no free will
Reductionist - suggests that genes only decide whether we get obese
Supported by Price et al (2008) so increased validity,
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