The Study
Five days of physical inactivity induced by dry immersion alter skeletal muscle metabolism and whole-body glucose tolerance in healthy men.
This study showed that if healthy guys stop moving for five days, their bodies start acting differently — like their muscles get worse at using sugar and their liver gets more fat. But it doesn’t prove that sitting too much every day causes diabetes — it just shows what happens in a super controlled experiment.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Even if you eat normally and don't gain weight, just lying still for five days can make your body worse at using sugar and more likely to store fat in your liver.
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 573 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—this shows that being inactive for less than a week can start damaging your metabolism before you even get diabetic or gain fat.
- 2Fasting insulin went up 46%, after-meal insulin jumped 90%, liver fat increased 21%, muscle cells became 25% less responsive to insulin, and protein breakdown rose 28%.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of applied physiology
Year
2025
Authors
Benjamin Lair, Elisa Le Roux, Isabelle de Glisezinski, Dominique Larrouy, I. Harant, M. Bareille, L. Treffel, G. Gauquelin‐Koch, Cédric Moro, Chantal Simon, Claire Laurens, A. Bergouignan
Related Content
Claims (6)
Five days of complete bed rest in healthy men reduces insulin signaling in muscle tissue by 25% in Akt Thr308 phosphorylation and lowers muscle glycogen synthesis by 15% under controlled laboratory conditions.
Five days of complete physical inactivity caused by dry immersion raises liver fat by 21% in healthy young men, without changes in muscle fat or overall fat burning.
Five days of inactivity reduces the ability of skeletal muscle cells to switch from burning fat to burning glucose when glucose levels rise, even though their ability to burn fat when fat levels are high remains unchanged.
In healthy young men, five days of complete physical inactivity caused by dry immersion lowers the body's ability to use insulin effectively, raises insulin levels in the blood after fasting by 46% and after meals by 90%, while blood sugar levels during fasting remain unchanged.
Five days of complete bed rest in a dry immersion environment causes a 28% increase in protein breakdown in healthy young men, measured by higher nitrogen levels in urine, even when calorie intake is low and fat and carbohydrate metabolism remain unchanged.
Long-term lack of physical activity leads to reduced metabolic function, weakened cardiovascular health, and decreased cognitive performance.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.