The Study
Amygdala–liver signalling orchestrates glycaemic responses to stress
This study is like watching a mouse’s brain turn on a sugar factory in its liver when it’s scared — we see the brain and liver are connected and work together, but we can’t say for sure the brain causes the sugar spike because we didn’t randomly assign mice to be scared or not. And we can’t say this happens the same way in people.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
When a mouse is scared, its brain tells its liver to make more sugar for energy — even without hormones from the pancreas or adrenal glands. But if the mouse is scared too often, this brain signal stops working, and its blood sugar stays high even when calm, leading to weight gain.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 513 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this mirrors how chronic human stress may contribute to type 2 diabetes and obesity.
- 2Acute stress raised blood glucose by ~50% in 30 minutes; repeated stress caused fasting glucose to rise by ~30% and increased body weight by ~15% on high-fat diet.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nature
Year
2025
Authors
J. Carty, K. Devarakonda, R. O'Connor, A. Krek, D. Espinoza, M. Jimenez-Gonzalez, A. Alvarsson, R. Hampton, R. Li, Y. Qiu, S. Petri, A. Shtekler, A. Rajbhandari, K. Conner, M. Bayne, D. Garibay, J. Martin, V. Lehmann, L. Wang, K. Beaumont, I. Kurland, G. Yuan, P. Kenny, S. Stanley
Related Content
Claims (6)
When you're stressed, a specific part of your brain sends a signal to your liver to make more sugar, and this happens because your body's 'fight or flight' system gets turned on.
When scientists turn on a specific brain circuit in mice that connects fear and stress areas to the metabolism control center, the liver starts making more sugar from scratch—even though the stored sugar in the liver doesn’t change.
When mice are stressed over and over, their brain’s stress response system gets duller, so they stop spiking their blood sugar when scared—and eventually end up with high blood sugar and weight gain, especially if they eat a lot of fatty food.
When mice get suddenly scared or stressed, a specific part of their brain sends a signal to their liver to quickly make more sugar, and this happens without needing their stress hormones or insulin/glucagon from the pancreas.
When you're under sudden stress, your liver quickly makes more sugar and releases it into your blood so your muscles have extra energy to react.
When you're stressed, two types of brain cells in a specific area send signals to another part of the brain that tells your body to raise your blood sugar — even though one type excites and the other inhibits, both can make your blood sugar go up.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.