Eating disorder predisposition toward eating disorders as a result of Mendelian inheritance. Twin studies have found a slight instances of genetic variance when considering the different criterion of both anorexia nervosa and bulimia nervosa as endophenotypes contributing to the disorders as a whole. A genetic link has been found on chromosome 1 in multiple family members of an individual with anorexia nervosa. An individual who is a first degree relative of someone who has had or currently has an eating disorder is seven to twelve times more likely to have an eating disorder themselves. Twin studies also show that at least a
Eating Disorder Inventory to the Eating disorder inventory was in 1991. The 1991 version, Eating disorder inventory-two (EDI-2) is used for both males and females over age 12. The EDI-2 retains the original format of the EDI with the inclusion of 27 new items divided into three additional subscales:<br> 1. Asceticism: Reflects the avoidance of sexual relationships<br> 2. Impulse Regulation: Shows the ability to regulate impulsive behavior, especially the binge behaviour<br> 3. Social Insecurity: Estimates social fears and insecurity The latest revision to the Eating disorder inventory; Eating disorder inventory-three (EDI-3) was released in 2004. It contains the original items of the first