A new study suggests tailored interventions, focusing on parental self-efficacy, may improve outcomes for adolescents with anorexia nervosa who show slow weight gain early in treatment, challenging one-size-fits-all approaches.
Family-based treatment remains the leading psychological approach for adolescents with anorexia nervosa, but its success depends heavily on how early progress unfolds. A recent trial led by Lock, Le Grange, Bohon, Matheson and Jo asked a practical question: if a young person is not gaining weight quickly enough at the start, should clinicians simply carry on as normal, or adapt the treatment? Their answer was more nuanced than a simple yes or no. The study suggests that while early weight gain is an important warning sign, not every slow start calls for extra treatment, and the families most likely to benefit from added support may be those in which parents feel least confident at the outset.
That focus on early response is grounded in years of research. Earlier studies found that weight gain in the opening sessions of family-based treatment is strongly linked with remission later on, with one analysis showing that even relatively modest gains by session four can help identify likely responders. Other work across adolescent eating-disorder treatments reached similar conclusions, reinforcing the idea that what happens in the first few weeks often matters more than clinicians once assumed. In that sense, early response is not just a marker of progress; it can also be a guide to whether treatment should be changed.
The new trial enrolled 107 adolescents aged 12 to 18 who met criteria for anorexia nervosa and were well enough for outpatient care. All began standard family-based treatment. By session four, those who had not gained 2.4kg were classed as early non-responders and randomly assigned either to continue standard treatment or to receive three additional sessions of Intensive Parental Coaching, or IPC. The extra intervention was designed to strengthen parents’ ability to challenge the eating disorder through direct coaching, family meals and problem-solving around obstacles to weight restoration.
On the whole, the added coaching did not improve outcomes for early non-responders as a group. That finding matters because it argues against reflexively layering more treatment on top of a model that is already active and evidence-based. The overall recovery rate in the study was broadly in line with earlier family-based treatment research, which also suggests that a slow early start does not automatically mean the approach has failed. Some adolescents who miss the early weight-gain threshold still improve with standard care alone.
The more interesting result came from looking at parents’ confidence in their ability to take on anorexia nervosa. Families in which parents began treatment with lower self-efficacy appeared to benefit more from IPC, with remission rates improving when extra coaching was added. For parents who already felt relatively confident, the intervention did not seem to add much. That distinction points towards a more targeted model of care: not simply asking whether a patient is responding early, but also whether the family has a specific barrier that additional coaching could realistically address.
That idea is clinically useful because parental self-efficacy can be measured with a short questionnaire and does not require specialised testing. In practice, clinicians may be able to combine two straightforward questions: has the adolescent gained enough weight by session four, and do the parents feel able to lead the recovery process? If the answer to both suggests difficulty, extra support may be justified. But the study also reinforces a more important point: low parental confidence is not a failure of parenting. Family-based treatment assumes that anorexia nervosa places extraordinary strain on the whole household, and helping parents regain confidence is part of the treatment itself.
The broader lesson is that family-based treatment should be adapted thoughtfully, not automatically intensified. Early weight gain remains a valuable indicator, and clinicians should monitor it closely. Yet the evidence now suggests that the next step depends on why progress is slow. For some families, continuing with well-delivered standard treatment may be enough. For others, especially those struggling with low confidence and high distress, targeted parental coaching may offer a better fit. In short, the most effective response to stalled progress may be precision, not just more treatment.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
