The Study
Impact of acute stress on murine metabolomics and metabolic flux
This study shows that when you pick up a mouse and take its blood from its tail, its body reacts by making more lactate — like a quick burst of energy. But it doesn’t prove that stress causes this in every mouse, or in people — it just shows it happened in these 10 mice.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
When scientists take blood from a mouse’s tail, the mouse gets scared, and its muscles pump out lots of lactate and pyruvate — like a sprinter’s legs burning. This makes the blood look weird, even if nothing’s wrong with the mouse. The best way to get real data is to take blood from a tiny tube already in its artery, without scaring it.
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 512 / 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 — if you measure mouse blood by tail snip, you’re not seeing real metabolism; you’re seeing stress noise.
- 2This affects all past and future studies using tail snips.
- 3Lactate goes up 5x, pyruvate 14x after tail snip.
- 4Lactate is the #1 fuel molecule in fasted mice — even more than glucose.
- 5It feeds the energy factory (TCA cycle) more than glucose does.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Proceedings of the National Academy of Sciences of the United States of America
Year
2023
Authors
W. Lee, Lingfan Liang, Jenna E. AbuSalim, Connor S. R. Jankowski, Laith Z. Samarah, Michael D. Neinast, Joshua D. Rabinowitz
Related Content
Claims (7)
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.
Using a tiny tube in a mouse’s artery to measure blood flow is more reliable than cutting its tail, because tail cutting stresses the mouse and gives wrong numbers.
When mice haven't eaten, their blood has more lactate than any other fuel molecule—even more than sugar—and their body uses this lactate as the main fuel to power their cells, even when they're not stressed or in danger.
Cutting a small piece off an animal’s tail releases chemicals from the damaged tissue, which messes up the blood test results by making it look like there are more of these chemicals in the body than there really are.
When mice are suddenly handled and stressed, their bodies quickly make certain energy fuels—like lactate and fatty acids—because their fight-or-flight system kicks in. This claim says that giving mice the same stress hormones (epinephrine and norepinephrine) makes them produce those same fuels just as fast, proving it’s the hormones, not the stress itself, doing the work.
When a mouse gets suddenly scared or stressed, its body first releases energy chemicals from muscles and fat within two minutes, and then about 15 to 30 minutes later, its liver starts making sugar to keep the energy flowing.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.