Assessment & Research

Cognitive bias in eating disorders: implications for theory and treatment.

Williamson et al. (1999) · Behavior modification 1999
★ The Verdict

Clients with eating disorders do not lack facts; their minds are tuned to pick up thinness cues and ignore the rest.

✓ Read this if BCBAs who write cognitive-behavioral goals for teens or adults with anorexia or bulimia.
✗ Skip if Clinicians working solely with autism, Prader-Willi, or medical feeding issues.

01Research in Context

01

What this study did

Feldman et al. (1999) pulled together every controlled study they could find on thinking patterns in anorexia and bulimia. They looked at how clients notice, remember, and react to food, weight, and body cues.

The review asked one simple question: do these clients process fat-and-diet information differently from everyone else?

02

What they found

The answer was yes. Clients with eating disorders spot food words faster, recall more diet ads, and shrug off normal body cues. Their minds zoom in on anything that screams thinness.

This biased filter helps explain why reassurance and nutrition facts alone rarely stick.

03

How this fits with other research

Moritz et al. (2009) ran a similar test with OCD clients and found the same pattern: not a knowledge gap, but a threat lens. The bias idea travels across disorders.

MShawler et al. (2021) muddied the waters in autism. They showed that negative attention bias there is tied to depression, not the autism label itself. It reminds us to check for mood issues before blaming the diagnosis.

Neville-Jones et al. (2025) looked at parents, not patients, and found sharper cognitive flexibility in moms of anorexia clients. The bias may run in families, yet show up in different ways.

04

Why it matters

If you treat eating disorders, stop repeating facts and start training attention. Use attention-modification games, brief mindfulness, or exposure to healthy-body images right before meals. Target the bias, not just the behavior.

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Start each session with a two-minute healthy-body photo slide show, then immediately practice a non-body topic to retrain attention.

02At a glance

Intervention
not applicable
Design
narrative review
Population
other
Finding
not reported

03Original abstract

Research testing the predictions of cognitive-behavioral theory related to the psychopathology of eating disorders has lagged behind treatment outcome research. Central to cognitive theories of eating disorders is the hypothesis that beliefs and expectancies pertaining to body size and to eating are biased in favor of selectively processing information related to fatness/thinness, dieting, and control of food intake or body weight. In recent years, controlled investigations of the predictions of cognitive theories of eating disorders have yielded empirical support for these theories. This paper reviews research which has tested the predictions of cognitive-behavioral theory and discusses the implications of these findings for the treatment of eating disorders. Understanding of information processing biases may assist the clinician in understanding a range of psychopathological features of anorexia and bulimia nervosa, including denial, resistance to treatment, and misinterpretation of therapeutic interventions.

Behavior modification, 1999 · doi:10.1177/0145445599234003