The Study
Use of a Two-stage Insulin Infusion Study to Assess the Relationship Between Insulin-Suppression of Lipolysis and Insulin-Mediated Glucose Uptake in Overweight/Obese, Nondiabetic Women
This study looked at two things in women: how well their body uses sugar and how well it stops releasing fat. It found that when one was weak, the other was usually weak too — like two keys that break together. But it didn’t change anything to test if one causes the other — it just noticed they often happen together.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
When your body doesn't respond well to insulin, it can't stop fat from leaking out of fat cells, and it also can't move sugar into your muscles.
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 555 / 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.
- 1This means if your body struggles to control fat release, it's very likely also struggling to control blood sugar — even if you're not diabetic.
- 2When insulin was low (15 µU/mL), fat levels (FFA) were much higher in insulin-resistant women.
- 3When insulin was high (80 µU/mL), sugar levels (glucose) were 3x higher in those same women.
- 4FFA and glucose levels were strongly linked (r=0.85).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Metabolism: clinical and experimental
Year
2011
Authors
T. McLaughlin, G. Yee, Alexander J. Glassford, C. Lamendola, G. Reaven
Related Content
Claims (6)
In overweight or obese women without diabetes, higher levels of free fatty acids in the blood during low insulin conditions are directly linked to higher blood glucose levels during high insulin conditions, reflecting a relationship between reduced fat suppression and reduced glucose uptake in muscle.
In overweight or obese women without diabetes, insulin suppresses fat release from fat tissue most effectively at a low dose, and it increases glucose uptake in muscle most effectively at a high dose, showing that fat and muscle tissues respond to insulin at different concentrations.
In overweight or obese women without diabetes, high levels of free fatty acids in the blood during normal insulin conditions are linked to how well the body uses insulin to absorb glucose, not to how much body fat they have.
In overweight or obese women without diabetes, a specific 4-hour insulin infusion test measures how resistant fat tissue is to insulin by tracking free fatty acid levels and how resistant muscle is to insulin by tracking glucose uptake.
High insulin levels reduce the breakdown of fat by decreasing the activity of hormone-sensitive lipase.
In overweight or obese women without diabetes, the level of glycerol in the blood during a low insulin dose is strongly linked to the level of glucose during a high insulin dose, indicating that higher free fatty acids result from increased fat breakdown rather than reduced fat re-storage.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.