Representative sample, Klump reported that 50 percent of the variability in individual differences in eating disorders can be attributed to genes. (“Are Eating Disorders Hereditary?”) The author found that, among white Caucasians, eating disorders have a substantial hereditary basis. People with certain rare genetic mutations have significantly higher risks of developing an eating disorder. Eating disorders are known to run in families, but a new study finally identifies two genes that most increase a person's risk of developing anorexia and bulimia (US News). A study by Stephanie Zerwas and Cynthia Bulik in 2013 examined several decades of genetic research (including family, twin, and adoption studies). Their studies reported a heritability of anorexia nervosa and bulimia nervosa of between 33-84% and 28-83%, respectively. Interestingly, the remainder of the variability we observed in behavior appears to be due to unique, non-shared environmental factors. A comparison of the rate of eating disorders between identical and non-identical twins should allow us to estimate the degree to which nature (shared genes) influences nutrition