Kim's identical twin sister was just diagnosed with anorexia nervosa. Kim tells the nurse that she is concerned that she may also develop the disorder. Which of the following responses by the nurse is the most appropriate?
A) "Eating disorders have not been found to be genetic, so you do not have a risk for developing the disorder."
B) "While eating disorders have shown a genetic link, environmental factors also play a role in the development of eating disorders."
C) "Identical twins have about a 5% chance of both twins developing an eating disorder."
D) "It is not genetics that increases the risk, it is environment. Since you both live in the same environment, you have an equal chance of developing the disorder."
Ans: B
Feedback:
Studies of twins and the sisters and daughters of people with eating disorders suggest a genetic link. Monozygotic twins have a concordance rate of 50% to 80% for eating disorders (Anderson and Yager, 2005). Wade and colleagues (2000) attribute 58% of cases of anorexia nervosa to genes, with environmental factors also having a strong influence. The exact role of genetics in eating disorders, however, remains speculative.
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