Anorexia nervosa rising prevalence of eating disorders in adolescence are "increase of adipose tissue in girls, hormonal changes of puberty, societal expectations of increased independence and autonomy that are particularly difficult for anorexic adolescents to meet; [and] increased influence of the peer group and its values." Early theories of the cause of anorexia linked it to childhood sexual abuse or dysfunctional families; evidence is conflicting, and well-designed research is needed. The fear of food is known as "sitiophobia", "cibophobia", or "sitophobia" and is part of the differential diagnosis. Other psychological causes of anorexia include low self-esteem, feeling like there is lack of
The Story of the Youth Who Went Forth to Learn What Fear Was attempts to learn fear, which eventually leads to his awareness of mortality. This tale type did not appear in any early literary collection but is heavily influenced by the medieval adventure of Sir Lancelot du Lac called "", where he spends a night in a haunted castle and undergoes almost the same ordeals as the youth. A father had two sons. The younger, when asked by his father what he would like to learn to support himself, said he would like to learn to shudder. A sexton told the father that he could teach the boy. After teaching him to