Which of the following statements is true of the cultural differences in feeding and eating disorders?

A) A meta-analysis found that bulimia nervosa is considerably more common in Westernized cultures than in non-Westernized cultures.
B) The prevalence of bulimia nervosa has decreased significantly in the second half of the twentieth century.
C) Since 1990, the prevalence of bulimia nervosa has increased dramatically in the United States, Europe, and Australia.
D) The incidence of anorexia nervosa was stable between 1930 and 1970, but has risen significantly since then.

A meta-analysis of studies found that bulimia nervosa is much more common in Westernized cultures than non-Westernized cultures. This suggests that cultural factors may play a role in the development of the disorder. The other options (B, C, and D) are all incorrect. The prevalence of bulimia nervosa has not decreased significantly in the second half of the 20th century (B); in fact, it appears to be on the rise in some cultures. Additionally, the prevalence of bulimia nervosa has not dramatically increased since 1990 (C); while there have been some reports of increasing rates in certain populations, the evidence is mixed. Finally, the incidence of anorexia nervosa has not been stable between 1930 and 1970 and has not risen significantly since then (D); the incidence of anorexia nervosa has increased over time, although there is some debate about the extent of the increase.