This approach considers the possibility of infection which is an unlikely cause of eating disorders. It also focuses on:
- genetic vulerability - by looking at twin studies;
- environmental factors;
- biochemical factors such as endocrine dysfunction and changed hormone levels.
This spproach has been criticised in that:
- There is not a 100% concordance rate for monozygotic twins.
- Changes in biochemistry may be the result of the disorder, rather than the cause.
- Care needs to be taken befote generalising research finding based on animals to humans.
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