Genes, parenting and brain signals converge in review of avoidant restrictive food intake disorder

Avoidant Restrictive Food Intake Disorder (ARFID) has the earliest age of onset of any eating disorder, and a new integrative review argues that understanding it requires looking simultaneously at biology, psychology and the family environment. The review, published in the Journal of Eating Disorders, systematically searched PubMed, PsycINFO and Web of Science for peer-reviewed studies published after 2013, the year the formal ARFID diagnosis was first introduced. From those searches, 21 eligible studies met the criteria: each examined ARFID in children in relation to parenting practices, feeding practices, or biological influences on the disorder's development.

The biological findings point to potentially distinct neurological and hormonal profiles in children with ARFID. The reviewed evidence included reports of reduced brain volume, atypical appetite hormone signaling, heritable genetic contributions, and epigenetic processes such as methylation of the DAT1 gene. These are associations drawn from the included studies rather than established causal mechanisms, and the review's authors emphasize that the underlying etiology remains poorly understood.

On the psychosocial side, the review identified maladaptive parenting strategies, poor parent-child relationship quality, and parental accommodation as risk factors associated with ARFID. By contrast, supportive caregiving strategies appeared protective in the studies examined. The authors stress that these are associations observed across the eligible studies, and the review design cannot establish the direction of effects between parenting and symptoms.

One of the more intricate pathways described in the review connects maternal psychopathology to child ARFID risk through child emotion dysregulation, with that pathway moderated by the child's genotype. In other words, the reviewed evidence suggests that a mother's psychological difficulties may relate to a child's ARFID risk partly via the child's ability to regulate emotions, and that this relationship varies depending on the child's genetic makeup. This kind of gene-environment interplay is precisely what the authors say future longitudinal research needs to disentangle, because cross-sectional and retrospective designs cannot capture how these influences unfold over development.

The review also flagged early-life markers that surfaced as salient predictors of ARFID symptom trajectories: early developmental difficulties, premature birth, and somatic complaints. The public health stakes are considerable. The authors note that eating disorders carry a significant burden through the cost of treatment and high lifetime prevalence rates, and that ARFID's early onset gives it particular potential to disrupt child development.

Methodologically, the review is an integrative one, meaning it combined studies of varied designs rather than restricting itself to a single study type, with systematic searches and explicit inclusion criteria: peer review, publication after 2013, and a focus on children with ARFID alongside parenting, feeding, or biological factors. The authors conclude that the findings support a biopsychosocial framework for understanding ARFID, in which biological vulnerability, psychological processes and the caregiving environment interact rather than operate independently. The clearest takeaway for researchers is the call for longitudinal work.

The review's evidence base, drawn from studies published in the roughly decade since ARFID entered the diagnostic manuals, is still too thin to settle questions of cause and sequence. Tracking children over time, the authors argue, is the way to examine the complex gene-environment interactions underlying the development of ARFID and its subtypes, and to determine which of the associated biological profiles and family factors are consequences, contributors, or correlated markers of the disorder's course.

Subject of Research: Biological, psychological and social contributors to the development of avoidant restrictive food intake disorder in children

Article Title: Biopsychosocial development of avoidant restrictive food intake disorder: an integrative review

Article References: Love, A. A., Haase, G., & Hormes, J. M. (2026). Biopsychosocial development of avoidant restrictive food intake disorder: an integrative review. Journal of Eating Disorders. https://doi.org/10.1186/s40337-026-01795-4

Image Credits: AI Generated

DOI: 10.1186/s40337-026-01795-4

Keywords: ARFID, eating disorders, biopsychosocial, integrative review, parenting practices, feeding practices, appetite hormones, epigenetics, DAT1 methylation, child development, maternal psychopathology, premature birth