Biological explanations of obesity
- Created by: katiewho
- Created on: 10-03-17 09:44
View mindmap
- Biological Approach for Obesity
- Stats
- Type 2 diabetes increased 10% since 1996
- Obesity has increased since 1990s
- Genetic Theories
- Family Clusters
- 1 obese parent = 40% risk
- 2 obese parents = 80% risk
- No obese parents = 7% risk
- Twins
- MZ raised apart = more similar in weight
- 66% to 70% heritability
- Genetics appear stronger in lighter twins
- Family Clusters
- Metabolic Rate Theory
- RMR is highly heritable
- Appetite Regulation
- Appetite control depends on agentic pre-disposition
- 2 children identified with defect in their ob gene
- Ob gene produces leptin
- Leptin: inhibits hunger. Makes us feel full.
- Released from fat cells sends signals to hypothalamus
- Injected with leptin
- Lost 1-2kg per month
- RWA
- Ob gene produces leptin
- Neural Model
- Hypothalamus is associated with obesity
- Abnormality in the VMH
- Post mortem showed that some obese females had a damaged VMH
- Can't claim cause and effect
- Regulates the metabolism
- NPY = starts eating
- VMH = stops eating
- Evaluation of Neural Model
- RWA - leptin injections
- Only works in a few people - is leptin really important?
- RWA - leptin injections
- Hypothalamus is associated with obesity
- Evaluation
- Doesn't explain why obesity is on the increase today - our gene pool has remained constant
- Unclear how genes are involved to obesity and to what extent
- Doesn't explain why geographical relocation to obesogenic environment often causes individuals to gain weight
- Evolutionary does
- Stats
Comments
No comments have yet been made