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Explanations of Eating Disorders Biological Explanations These fall into two categories - genetic inheritance or an imbalance of neurotransmitters in the brain. Genetic Explanation; * Science unable to identify genes for specific behaviour such as those associated with eating disorders * Research is based on trends in families * American Psychiatric Association reports from statistics that there is increased risk of eating disorders amongst first-degree biological relatives of those diagnosed. * However relatives usually share the same environment [nature vs. nurture] * Twin studies provide more reliable evidence. In comparing monozygotic (MZ) twins with dizygotic (DZ) twins, a significantly higher concordance rate was found among MZ twins compared with DZ twins. * Twin research into anorexia by Holland et al. found a 55% concordance rate for MZ twins compared to only 7% for DZ twins * Kendler et al. found similar results for bulimia nervosa, with 23% for MZ twins and 8.7% for DZ twins. * Even though the results from...

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