Hormonal
High intramyocellular lipid (IMCL) content in skeletal muscle is associated with whole-body insulin resistance, specifically blunting insulin-stimulated glucose uptake and antilipolysis, independent of body mass index (BMI) and physical fitness.
If you have high muscle fat content (IMCL), you may experience insulin resistance even if you are not overweight. This is not just about total body fat. Strategies to improve insulin sensitivity, such as exercise and dietary adjustments, may help normalize these signaling pathways. Focus on improving metabolic health rather than just weight.
In conclusion, IMCL accumulation is associated with whole-body insulin resistance and with defective insulin signaling in skeletal muscle independent of body weight and physical fitness.
Why this rating
Controlled clinical study with rigorous measurement (clamps, MR spectroscopy, biopsies) in a homogeneous group (healthy men, no diabetes), though cross-sectional design limits causal inference.
Source
Intramyocellular Lipid Is Associated With Resistance to In Vivo Insulin Actions on Glucose Uptake, Antilipolysis, and Early Insulin Signaling Pathways in Human Skeletal Muscle
Antti Virkamäki et al. · Diabetes · 2001
DOI 10.2337/diabetes.50.10.2337
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