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Anorexia nervosa is a serious mental disorder, recognised in clinical classification systems, characterised by a sustained restriction of food intake, an intense fear of weight gain, and a disturbance in the way body shape or weight is experienced. The companion lesson examined what biology — genes and neurochemistry — contributes to its development. This lesson turns to the psychological explanations: accounts that locate the origins of the disorder not (or not only) in physiology but in family relationships and dynamics, in learning and the social environment, and in patterns of thinking. Three explanations are required by the specification and developed here: family systems theory (associated with Salvador Minuchin), which sees the disorder as arising from dysfunctional family organisation; social learning theory, which emphasises modelling, reinforcement and the cultural "thin ideal" transmitted through media and peers; and cognitive theory, which centres on the cognitive distortions, body-image disturbance and irrational beliefs that characterise the disorder. As in the biological lesson, anorexia nervosa is discussed throughout in a measured, clinical, scientific register — as a condition to be understood and explained, treated with the dignity its sufferers deserve. The focus is strictly on causes, mechanisms and maintaining processes, never on graphic description of behaviours.
Key Definition: A psychological explanation of a mental disorder attributes its development to non-physiological factors — family dynamics, learned behaviour, social and cultural influences, and patterns of cognition — rather than (or in addition to) genetic and neural factors. For anorexia nervosa, the principal psychological explanations are family systems theory, social learning theory and cognitive theory.
This lesson addresses the following point from the AQA A-Level Psychology (7182) specification, Paper 3 — Eating Behaviour:
It develops the three named explanations — family systems theory (enmeshment, autonomy and control; the psychosomatic family), social learning theory (modelling, reinforcement, the media "thin ideal"), and cognitive theory (cognitive distortions, body-image disturbance, irrational beliefs) — and prepares you to describe (AO1) and evaluate (AO3) the psychological account. It pairs directly with the lesson on biological explanations of anorexia nervosa, and the two are frequently set against each other in extended-response questions, very often with an interactionist (diathesis–stress) conclusion required. Because these questions rarely include a scenario stem, the assessment objectives are typically split AO1/AO3 only, with no AO2 application required unless a stem is provided.
As in the biological lesson, a brief word on register. Anorexia nervosa must be discussed in a clinical, objective and respectful way: as a recognised disorder with identifiable psychological correlates and consequences, analysed with the same scientific detachment as any other condition. Answers — in this lesson and in the exam — should focus on explanation, mechanism and evaluation: on why the disorder develops and how it is maintained, never on graphic accounts of the behaviours themselves. This is simultaneously an ethical standard (dignity towards those affected) and an academic one (precision about causes). Maintained throughout, this register removes any difficulty from the topic.
The family systems approach, most closely associated with the family therapist Salvador Minuchin, does not treat the disorder as a property of the individual alone but as a symptom of dysfunction in the family as a whole. Drawing on his clinical work with families of young people with the disorder, Minuchin described what he called the "psychosomatic family" — a characteristic pattern of family organisation within which, he argued, disordered eating can develop and be sustained. The core idea is that the disorder serves a function within the family system: it diverts attention from other, unresolved tensions and stabilises a family that would otherwise be in open conflict. On this view the affected individual is, in a sense, the "symptom-bearer" for a troubled system.
Minuchin identified several interlocking features said to characterise such families. The first and best-known is enmeshment — an extreme over-closeness in which the normal boundaries between family members are blurred, so that members are over-involved in one another's lives, privacy and autonomy are limited, and it becomes difficult for the developing adolescent to establish a separate identity. Closely related is overprotectiveness, in which parents are excessively concerned with one another's and the child's welfare, restricting the child's independence. A third feature is rigidity — a family strongly committed to maintaining the status quo, which struggles to adapt to change, and for which the developmental changes of adolescence (the push towards autonomy and separation) are especially threatening. A fourth is a pattern of conflict avoidance and poor conflict resolution: such families do not address disagreements openly, so tensions remain unresolved beneath the surface.
Within this configuration, the disorder is theorised to emerge around the central developmental task of adolescence: achieving autonomy. In an enmeshed, overprotective, rigid family, the normal adolescent drive towards independence is frustrated, and the young person may experience a profound lack of control over their own life. The control of food intake can then become one domain in which the individual can exert autonomy — a sphere of the self over which they, and not the family, have authority. In this reading the restriction of eating is, paradoxically, an attempt to assert control and independence within a system that otherwise denies them. At the same time, the disorder discharges a stabilising function for the family: the shared focus on the affected member's eating deflects attention from marital or other conflicts, so that the family avoids confronting its underlying difficulties. Minuchin's clinical conclusion was that effective treatment therefore had to address the whole family system — through family therapy — rather than the individual in isolation, since the family patterns that gave rise to and maintained the disorder lay outside the individual.
Exam Tip: When writing about family systems theory, name the specific features (enmeshment, overprotectiveness, rigidity, conflict avoidance) and explain the mechanism — the frustrated adolescent drive for autonomy, with control of food becoming a substitute domain of control. Stating "bad families cause anorexia" earns little credit; the analytic marks lie in the autonomy/control logic and the family-stabilising function.
The social learning explanation locates the origins of the disorder in the social environment and in the principles of observation, modelling and reinforcement set out by Albert Bandura. On this account, disordered attitudes to eating, weight and shape are learned in the same way as other behaviours: by observing models, by imitating behaviour that is seen to be rewarded (vicarious reinforcement), and by being directly reinforced for thinness-related behaviour.
The central concept is the cultural "thin ideal" — the socially transmitted message that thinness is desirable, attractive and associated with success and worth. Social learning theory proposes that this ideal is modelled by salient figures: by the media (the pervasive presentation of an idealised, often digitally altered, body type as the norm and the route to admiration), by peers (whose attitudes to weight, shape and eating are observed and imitated, especially in adolescence), and sometimes within the family (where a parent's preoccupation with weight or dieting can be modelled by a child). Because the thin ideal is consistently associated, in these models, with reward — attractiveness, popularity, praise, success — the observer learns through vicarious reinforcement to value thinness and to internalise the ideal as a personal standard. The greater the internalisation of the thin ideal, the greater the dissatisfaction when one's own body fails to match it, and the stronger the motivation to pursue the modelled behaviour.
Beyond initial learning, social learning principles help explain how disordered eating is maintained. Behaviour consistent with the thin ideal may attract direct reinforcement — compliments, social approval, a sense of achievement and self-discipline — which, through operant conditioning, strengthens the behaviour. Attention and concern from others can also function, inadvertently, as reinforcement. In this way the social-learning account integrates vicarious processes (learning the value of thinness by observing rewarded models) with direct operant processes (the behaviour being reinforced once performed). Identification with high-status models — those the individual admires and wishes to be like — is held to increase the likelihood of imitation, which is why media figures and admired peers are thought to exert disproportionate influence, and why the disorder's onset clusters in adolescence, a developmental period of intense identity formation, peer sensitivity and social comparison.
| SLT mechanism | What is learned / reinforced | Typical source |
|---|---|---|
| Modelling | The thin ideal as desirable and attainable | Media figures, peers, sometimes parents |
| Vicarious reinforcement | Thinness is associated with reward (admiration, success) | Observed consequences for models |
| Direct reinforcement | Thinness-related behaviour is praised/approved | Compliments, social approval, sense of control |
| Identification | Increased imitation of admired, high-status models | Idealised role models, aspirational peers |
Key Definition: The thin ideal is the socially and culturally transmitted standard that equates thinness with attractiveness, success and worth. Social learning theory proposes that this ideal is modelled by media and peers and internalised through vicarious reinforcement, raising body dissatisfaction and the motivation to pursue thinness.
The cognitive explanation focuses on the distorted patterns of thinking that characterise anorexia nervosa — the way affected individuals perceive, interpret and reason about their bodies, food and self-worth. Where family systems theory looks to relationships and social learning theory to the environment, cognitive theory looks inward, to faulty information processing. Two strands are central: body-image disturbance and cognitive distortions / irrational beliefs.
A defining cognitive feature of the disorder is a disturbance in body image — a mismatch between the individual's perception or experience of their body and reality. This is not a failure of eyesight but of interpretation: the individual processes information about their own shape and size in a systematically biased way, experiencing their body as larger than it is. Because this perceptual–cognitive distortion is, to the individual, entirely real, attempts at reassurance from others are ineffective — the person genuinely experiences a discrepancy between how they appear and how they wish to appear. Body-image disturbance is significant because it helps explain the persistence of the disorder: the individual's own (distorted) perception continually appears to confirm the need for further restriction, creating a self-sustaining loop that external evidence cannot easily break.
Cognitive theory, drawing on the framework that Aaron Beck developed for depression and that has been extended to eating disorders, proposes that the disorder is underpinned by characteristic cognitive distortions — systematic errors in thinking — and by irrational, dysfunctional beliefs about weight, shape and self-worth. The same kinds of distortion identified in Beck's cognitive model recur in this domain:
| Cognitive distortion | Illustration in the context of eating and shape |
|---|---|
| All-or-nothing (dichotomous) thinking | Foods, days or the self are categorised rigidly as wholly "good" or "bad," with no middle ground |
| Overgeneralisation | A single perceived lapse is taken as proof of total failure or lack of control |
| Catastrophising | The consequences of a small change are magnified into disaster |
| Selective abstraction | Attention fixates on shape/weight cues to the exclusion of other evidence about the self |
| Personalisation / magnification | Self-worth is excessively tied to, and judged by, weight and shape |
Underlying these distortions, the cognitive account proposes a set of maladaptive core beliefs and assumptions — for example, that self-worth is contingent on controlling one's eating and shape, or that control over the body confers control and value in life more broadly. Such beliefs are often linked to perfectionism and to low self-esteem: the individual holds rigid, absolute standards and judges the self harshly against them, and the pursuit of control over eating becomes a means of achieving a sense of competence and worth otherwise felt to be lacking. Because these beliefs and distortions are self-confirming — the distorted body image and the all-or-nothing reasoning generate "evidence" that appears to justify them — cognitive theory provides a particularly clear account of how the disorder is maintained once established, and it furnishes the rationale for cognitive behavioural therapy (CBT), which targets the dysfunctional cognitions directly.
The three psychological explanations are not mutually exclusive; they describe different levels of the same phenomenon, and a sophisticated answer shows how they connect.
graph TD
FAM["Family systems<br/>enmeshment, overprotection,<br/>frustrated autonomy"] --> VULN["Psychological vulnerability<br/>need for control, low self-esteem,<br/>perfectionism"]
SLT["Social learning<br/>modelling + internalising<br/>the thin ideal"] --> VULN
VULN --> COG["Cognitive level<br/>distorted body image +<br/>irrational beliefs about shape/worth"]
COG --> MAINT["Self-confirming loop<br/>maintains the disorder"]
MAINT -.->|reinforces| COG
The diagram illustrates a defensible integration: family dynamics and social learning supply the predisposing conditions (a need for control, internalisation of the thin ideal), while the cognitive level supplies the maintaining mechanism (distorted perception and reasoning that sustain the disorder). This layering is exactly the kind of synthesis the highest bands reward, and it points naturally towards the interactionist conclusion developed in the evaluation.
Exam Tip: For cognitive theory, distinguish clearly between body-image disturbance (a perceptual–interpretive distortion) and the cognitive distortions/irrational beliefs (errors in reasoning and dysfunctional core beliefs). Strong answers use cognitive theory specifically to explain maintenance — the self-confirming loop — which complements rather than duplicates the other two explanations.
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