PVT-H3R signaling serves as a critical pathway converting circadian disruption to fat-specific hyperphagia, offering therapeutic targets for precise body-weight management.
Key Findings
Results
Insufficient sleep selectively increases high-fat diet preference without affecting standard chow or high-sugar consumption in both human cohort data and mouse models.
Findings integrated UK Biobank cohort analyses with mouse sleep restriction (SR) models
SR selectively increased high-fat diet preference (HFDP) but did not affect consumption of standard chow or high-sugar diets
This selectivity for fat overconsumption distinguishes sleep-loss-induced hyperphagia from general overeating
Results
Sleep restriction reduces the excitability of glutamatergic neurons in the paraventricular thalamus (PVT).
Whole-brain c-Fos mapping was used to identify activity changes across brain regions following SR
In vitro electrophysiological techniques confirmed reduced excitability specifically in glutamatergic PVT neurons
The PVT was identified as a key node linking sleep disruption to altered feeding behavior
Local overexpression of H3Rs in the PVT prevented or reversed SR-induced HFDP
Local inhibition of β-arrestin in the PVT similarly rescued the SR-induced fat overconsumption phenotype
These interventions confirm that the H3R/β-arrestin axis in the PVT is both necessary and sufficient to mediate fat-specific hyperphagia from sleep loss
What This Means
This research suggests that when people or mice don't get enough sleep, they are specifically drawn to eat more fatty foods — not simply more food in general, and not more sugary food. The study combined large-scale human data from the UK Biobank with experiments in mice to show this fat-specific overeating is not random but is driven by a precise brain mechanism. The key area involved is the paraventricular thalamus (PVT), a region deep in the brain, where sleep deprivation quiets down a specific population of nerve cells.
At the molecular level, the research found that sleep loss causes histamine — a chemical messenger — to build up in the PVT. This excess histamine triggers a chain reaction through a protein called β-arrestin, which causes the PVT to reduce its number of histamine H3 receptors (H3Rs). Fewer H3Rs means the brain circuit that normally restrains fat-seeking behavior becomes less effective. When researchers artificially restored H3R levels in the PVT, or blocked the β-arrestin pathway locally, sleep-deprived mice stopped overconsumingfatty food.
This research suggests that the connection between poor sleep and weight gain is not simply about having more waking hours to eat, but involves a specific molecular switch in the brain that promotes craving for high-fat foods. The identification of the PVT-H3R signaling pathway as this switch offers potential new targets for developing treatments aimed at preventing sleep-loss-related obesity, potentially allowing more precise interventions than broad appetite suppression.
Zhao X, Yan Y, Liang J, Zhang Y, Li M, Zhou Z, et al.. (2026). Histamine H3 receptors in the paraventricular thalamus link sleep loss to fat overconsumption.. Cell reports. https://doi.org/10.1016/j.celrep.2026.116967