A hypothalamic circuit for anticipating future changes in energy balance Walker, Samuel J. Lowenstein, Elijah D. Douglass, Amelia May Barnett ; https://orcid.org/0000-0001-5398-6473 Thomas, Callum M.P. Madara, Joseph C. Kucukdereli, Hakan Barbosa-Meillon, Eunice A. Tao, Jenkang Resch, Jon M. Lowell, Bradford B. hunger hypothalamus AGRP neurons neuroscience metabolism homeostasis feeding food intake energy balance appetite AgRP neurons cause hunger, the drive to seek and consume food. Their activation by fasting is key for survival and is thought to be triggered by feedback when energy stores are low. However, we know that environmental cues can also regulate AgRP neurons since cues that predict future food intake rapidly inhibit AgRP neurons, but is the converse true: can the prediction of future fasting rapidly activate AgRP neurons? Here, we show in mice that such rapid fasting activation of AgRP neurons does occur. This rapid activation is driven by excitatory input from paraventricular hypothalamic (PVH) neurons expressing Sim2, which are bidirectionally sensitive to predictions of future energy state. Thus, cognitively processed contextual information conveyed by PVHSim2 neurons strongly activates AgRP neurons. Lastly, chronic silencing of PVHSim2 neurons causes persistent hypophagia. This PVHSim2-to-AgRP-neuron circuit, by anticipating and preventing negative energy balance, provides an important new dimension of hunger regulation. Elsevier 2026 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/21955 Walker SJ, Lowenstein ED, Douglass AM, et al. A hypothalamic circuit for anticipating future changes in energy balance. <i>Neuron</i>. doi:<a href="https://doi.org/10.1016/j.neuron.2026.05.010">10.1016/j.neuron.2026.05.010</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.neuron.2026.05.010 info:eu-repo/semantics/altIdentifier/issn/0896-6273 info:eu-repo/semantics/altIdentifier/e-issn/ 1097-4199 info:eu-repo/semantics/altIdentifier/pmid/42235510 info:eu-repo/semantics/openAccess