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Dairy and industrial sources of trans fat do not impair peripheral insulin sensitivity in overweight women

Abstract : Background: The 2 major dietary sources of trans fatty acids (TFAs) are partially hydrogenated oils and ruminant-derived products. Epidemiologic data suggest that chronic consumption of industrial sources of TFAs could be damaging to insulin sensitivity, but intervention studies on this issue have remained inconclusive. Objective: The trial was designed to compare the effects of dairy compared with industrial sources of TFAs on insulin sensitivity in overweight women. Design: Sixty-three healthy women with abdominal obesity [waist circumference > 88 cm and a body mass index (in kg/m(2)) > 28] were recruited. After a run-in period, the volunteers were randomly assigned to consume 1 of 3 four-week diets: 60 g low-TFA lipids/d (0.54 g/d; n = 21), ruminant TFA-rich lipids (4.86 g/d; n = 21), or industrial TFA-rich lipids (5.58 g/d; n = 21). Changes in peripheral insulin sensitivity were assessed by using hyperinsulinemiceuglycemic clamps. Results: After the intervention period, fasting glycemia and insulinemia and insulin sensitivity were not significantly modified in either group (P > 0.05). Conclusions: These data indicate that consumption of dairy- and industrial-source TFAs for 4 wk at nutritional levels do not impair peripheral insulin sensitivity in insulin-resistant women. Our study may not preassess the effects of TFAs in normal insulin-sensitive individuals. This trial was registered at clinicaltrials.gov as NCT00617435. Am J Clin Nutr 2009;90:88-94.
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Anne-Laure Tardy, S. Lambert-Porcheron, C. Malpuech-Brugère, Christophe Giraudet, Jean-Paul Rigaudière, et al.. Dairy and industrial sources of trans fat do not impair peripheral insulin sensitivity in overweight women. American Journal of Clinical Nutrition, American Society for Nutrition, 2009, 90, pp.88-94. ⟨10.3945/ajcn.2009.27515⟩. ⟨hal-02661198⟩

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