Hormonal
Higher skeletal muscle membrane unsaturation, specifically increased A5 desaturase activity and higher levels of long-chain polyunsaturated fatty acids (C20-22 PUFA), is associated with improved insulin action (glucose disposal) and lower adiposity.
This research suggests that the types of fats you eat influence the structure of your muscle cell membranes. Specifically, diets that support higher levels of polyunsaturated fatty acids (PUFAs) and the enzymes that create them (like A5 desaturase) are linked to better insulin sensitivity. While this study doesn't prescribe a specific diet, it implies that dietary fat quality (specifically the ability to form long-chain PUFAs) is a lever for metabolic health.
Insulin action (high-dose clamp; MZ) correlated with composite measures of membrane unsaturation (% C20-22 polyunsaturated fatty acids [r = 0.463, P < 0.001], unsaturation index [r = -0.369, P < 0.01]), a number of individual fatty acids and with A5 desaturase activity (r = 0.451, P < 0.001).
Why this rating
Strong statistical correlations (P < 0.001) in a specific population (Pima Indians), but it is an observational study establishing association, not causation.
Source
Skeletal muscle membrane lipid composition is related to adiposity and insulin action.
David Pan et al. · Journal of Clinical Investigation · 1995
DOI 10.1172/jci118350
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