"You can't do meaningful psychological work in a starved brain"... right?

This gets said a lot in eating disorder circles. It's treated as obvious, but the research is more complicated.

The claim rests on the assumption that malnutrition reliably impairs cognition to the point where psychological work is futile until weight is restored. But when you look at what the studies actually show, the picture doesn't hold that neatly.

A 2023 study in Eating and Weight Disorders assessed cognitive functioning in hospitalised patients with severe and extreme anorexia nervosa - the majority meeting DSM-5 criteria for extreme AN based on BMI. Despite this, the patients demonstrated normal cognitive performance at admission compared to normative data. The study also found that weight gain during hospitalisation was not related to cognitive improvement - which directly undermines the logic that weight restoration is what unlocks the capacity for psychological engagement.

There's also a 1999 study that found something equally inconvenient for the received wisdom: anorexic patients improved on all measures of psychopathology and affective state as a result of therapy - while weight gain over the same period produced no corresponding improvement in cognitive performance. The psychological work moved. The cognitive deficits didn't follow weight in the way the theory predicts.

None of this means malnutrition has no effect on the brain. It does. Starvation affects physiological feedback, interoceptive processing, and emotional experience - with low weight further lessening physiological experience of emotion despite increased self-reported arousal. These are real and relevant clinical considerations.

But there's a meaningful difference between "starvation affects certain aspects of emotional and physiological processing" and "meaningful psychological work is impossible until weight is restored." The first is supported. The second is not - and it has real consequences when it's used to defer relational, motivational, and identity-based work indefinitely.

For clients with severe and enduring anorexia nervosa who are unlikely to reach a normal weight, excluding them from psychotherapeutic treatment on the basis that underweight impairs cognitive ability is a position the evidence does not support.

The field needs to hold both things at once: nutritional rehabilitation matters, and psychological work can and does happen alongside it. Sequencing them as if one must be complete before the other begins is a clinical assumption, not a research finding.

Want to know more about non-weight focused eating disorder treatment? Exhale Psychology Centre is dedicated to non-weight focused eating disorder treatment. Check out our free resources or online training via link in bio.

References:
Rekkedal, G.A. et al. (2023). Cognitive performance in hospitalised patients with severe or extreme anorexia nervosa. Eating and Weight Disorders, 28, 81.
Lauer, C.J. et al. (1999). Cognitive functioning, weight change and therapy in anorexia nervosa. Behaviour Research and Therapy, 34(2), 175–184.
Oldershaw, A. et al. (2019). Anorexia nervosa and a lost emotional self: A psychological formulation of the development, maintenance, and treatment of anorexia nervosa. Frontiers in Psychology, 10, 219.
Hay, P. et al. (2020). Psychological treatments for people with severe and enduring anorexia nervosa: A mini review. Frontiers in Psychiatry, 11, 206.