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
Hedonic hunger two endogenous rewarding chemical signals influences food intake and, ultimately, body mass. Hedonic hunger Hedonic hunger or hedonic hyperphagia is "the drive to eat to obtain pleasure in the absence of an energy deficit." Particular foods may have a high "hedonic rating" or individuals may have increased susceptibility to environmental food cues. Weight loss programs may aim to control or to compensate for hedonic hunger. Therapeutic interventions may influence hedonic eating behavior. Although hunger may arise from energy or nutrient deficits, as would be expected in the set-point theories of hunger and eating, hunger may arise more commonly from anticipated