Research uncovers a potential genetic factor, PLIN4 variants, that may influence fat storage and energy regulation in severe forms of anorexia nervosa, highlighting a biological dimension to the disorder.
A new Frontiers in Psychiatry study suggests that rare, damaging variants in PLIN4 may be more common in people with anorexia nervosa than in the general population, adding to evidence that the disorder can have a measurable biological component as well as psychological and environmental drivers. In the analysis, 154 unrelated patients with anorexia nervosa underwent whole-exome sequencing, and 11.0% carried rare PLIN4 variants predicted to be damaging, compared with 3.2% in a population reference set. The authors say the signal survived correction for multiple testing and points towards lipid-droplet biology as a possible contributor to disease risk.
The research focused on families in which anorexia nervosa appeared repeatedly across relatives, allowing investigators to search for rare coding changes that might have a larger effect than the common variants usually picked up in genome-wide studies. The strongest signal came from PLIN4, which encodes perilipin 4, a protein involved in lipid droplets, the cellular structures that store fat. The study also reported several cases in which the same PLIN4 loss-of-function variant was found in affected relatives, offering family-level support for the gene’s potential role.
That finding fits with a wider body of metabolic research suggesting that lipid droplets are not passive fat stores but active regulators of energy balance. A 2026 review in RSC Chemical Biology described these structures as dynamic hubs that help integrate fat storage with whole-body metabolism, and noted that disturbed lipid-droplet function is linked with disorders such as obesity and insulin resistance. More recently, a Nature Metabolism study reported that phosphorylation of PLIN5 helps coordinate interactions between mitochondria and lipid droplets in the liver, underscoring the importance of this protein family in controlling lipid flux.
The anorexia study’s authors argue that PLIN4 could matter because altered fat handling may intersect with features that are already central to the illness, including strong aversion to weight gain and persistent concerns about body shape. They also point to earlier work showing that PLIN4 variants have been associated with body-fat distribution and higher triglyceride levels, which may help explain why the gene stood out in their cohort. Still, the researchers caution that the sample was drawn from a specialist clinic and was enriched for severe, treatment-resistant cases, so the findings will need replication in independent, more broadly ascertained groups before they can inform routine care.
For parents and caregivers, the practical message is not that a single gene explains anorexia nervosa, but that the disorder may involve identifiable biological pathways in some patients. The study adds to growing evidence that inherited variation can shape risk, severity and perhaps the metabolic profile of the illness. For now, the work is best seen as a step towards understanding why anorexia nervosa develops in some people and how its biology might eventually guide 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.
