Genes are involved in the risk for eating disorders, and in the case of anorexia and bulimia, there is evidence of

a. multiple subtle brain irregularities, such as with appetite regulation.
b. a specific gene for anorexia and a different specific gene for bulimia.
c. a single common gene that causes both anorexia and bulimia.
d. damage to one specific brain region that leads to the disordered eating behavior.

Answer: a. multiple subtle brain irregularities, such as with appetite regulation.