Eating Behaviour . Unit PSYA3 Miss Bird. What will we cover in this topic?. Where we are now. What we have covered. RECAP: Dual-control theory. Proposes that the body has two separate systems; one for turning eating ‘on’ and one for turning eating ‘off.’
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Where we are now
What we have covered
Proposes that the body has two separate systems; one for turning eating ‘on’ and one for turning eating ‘off.’
Lateral hypothalamus (LH) –feeding centre, stimulates eating behaviour.
Ventromedial hypothalamus (VMH) – satiety centre, stops eating behaviour.
Increase in blood glucose
Ventromedial hypothalamus activated
Lateral hypothalamus activated
Decrease in blood glucose
Last lesson we looked at research to support the role of the lateral hypothalamus (LH) in initiating feelings of hunger and eating.
Lutter et al (2008)
This lesson we will lookat research to support the role of the ventromedial hypothalamus (VMH) in initiating feelings of satiety and stopping eating.
Be prepared to feedback to the class.
You have 10 minutes
X If it was this simple obese people could just be injectedwith leptin toreduce weight. However it is not the case that all obese people havelow levels of leptin.
X The biological approach is reductionist, focusing only on biological systems regulating food intake and body weight. It ignores psychological, cultural and social factors that can influence our eating behaviour.
In pairs, discuss and make notes on any issues, debates or approaches that you could apply to the dual-control theory of eating behaviour and associated research.
Something to think about…
Reductionism – biological explanation only focuses on limited factors which can be used to explain eating behaviour. It pays no attention to psychological, cultural and social factors that influence our eating behaviour.
Deterministic – damage to the LH, VMH, or lack of leptin can result in disordered eating.
Biological approach – cannot provide full explanation as it ignores the role of nurture. (Nature vs. Nurture).
Ethical issues – is it ethical to test on animals? Much of the research is on mice/rats. Based on principle that brain systems similar to humans but to what extent can findings be generalised?
Ignores evolutionary approach – suggest primary stimulus for hunger and eating is food’s positive-incentive value.
Real-world applications of research - insight into brain chemicals may be used to develop medical interventions to help change what we eat and manage our weight (e.g. obese patients).