Empirical observations imply that impulsivity is specifically associated with poor prognosis in eating disorders. The present paper cites studies suggesting that this factor is predominantly associated with the bulimic pattern of eating disturbance, while "restriction" may be associated rather with hypercontrol of behaviour. Further evidence is cited suggesting that the relationship between hyper-and hypocontrol is actually very intimate, both on a behavioural and biochemical level. Rather than bulimics being generally impulsive and "restrictors" generally hypercontrolled, future studies may reveal impulse regulation difficulties of both kinds in both groups. Single-minded preoccupation with dieting may be an ill-equipped individual's effort to simplify life in periods of change and environmental challenge that demand capacity for flexible impulse regulation.
IntroductionContrary to impressions of both professionals and the lay public, recent evidence suggests that the incidence of anorexia nervosa may not be greater today than during previous decades (Lucas et Nielsen, 1990). Still, this disorder and related patterns of weight-shape preoccupation, body image disturbance and severely disordered eating (bulimia nervosa and atypical or subclinical variants) continue to present significant health problems. Thus, beyond the risks directly associated with starvation, binge eating and purging, there are often significant and long-lasting psychological and social sequelae.Some 90-95% of patients are women and there is a fair amount of consensus that the disorders begin with dieting, often starting in the context of separation (e.g. going to boarding school, au pair work in another country, loss of a love relationship). For some, dieting escalates into frankly anorexic food refusal and emaciation. For others dieting is interrupted by periods of binge eating in which huge amounts of food are consumed in a short time, only to be purged immediately afterwards. When the afflicted individual eventually seeks help, her condition is a mixture of basic psychopathology and the effects of acute malnutrition (e.g. Woell et at., 1989). No firm conclusions have been drawn concerning why some dieters go on to have clinical eating disorders. In the present paper I will discuss how investigation of impulse regulation could shed some light on this issue.