The Study
Association Between Fasting Insulin Levels and Handgrip Strength: A Cross-Sectional Study Using the Korean National Health and Nutrition Examination Survey
This study looked at a big group of Korean adults and found that people with higher insulin levels tended to have weaker hand grips. But it didn't follow them over time, so we don't know if high insulin makes muscles weak, or if weak muscles make insulin go up.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Even if you're not overweight or diabetic, having too much insulin in your blood might mean your muscles are starting to get weaker — before you notice any other health problems.
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 544 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this suggests muscle weakness could be an early warning sign of metabolic trouble, even before diabetes or obesity shows up.
- 2In adults with normal weight and no diabetes, those with higher fasting insulin had weaker handgrips — especially women, where higher insulin always meant lower strength.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of Clinical Medicine
Year
2025
Authors
Hyang-Rae Lee, M. Ko, Seung-Kuy Cha, Taesic Lee
Related Content
Claims (6)
Persistently high insulin levels lead to impaired metabolism and increased fat storage, while short-term increases in insulin stimulate the building of muscle protein.
In Korean adults aged 20 and older, higher fasting insulin levels are linked to weaker handgrip strength, particularly in non-obese individuals under 65 without diabetes.
In Korean adults, higher fasting insulin levels are linked to lower handgrip strength in women in a straight-line pattern, while in men, the relationship follows a J-shaped curve, meaning both very low and very high insulin levels are associated with weaker handgrip strength.
In non-obese Korean adults without diabetes, higher fasting insulin levels are linked to weaker handgrip strength, indicating that muscle weakness can appear before blood sugar rises or weight gain occurs.
In women, measuring fasting insulin along with BMI provides a more accurate prediction of low handgrip strength than BMI alone, showing that insulin levels add useful information for identifying metabolic risk beyond body weight.
In Korean adults, higher fasting insulin levels are weakly linked to stronger handgrip strength before accounting for age and body fat, but after accounting for these factors, higher fasting insulin is linked to weaker handgrip strength.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.