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Effect of Lowering the Glycemic Load With Canola Oil

Despite their independent cardiovascular disease (CVD) advantages, effects of a-linolenic acid (ALA), monounsaturated fatty acid (MUFA), and low-glycemic- load (GL) diets have not been assessed in combination. Researchers from Canada therefore determined the combined effect of ALA, MUFA, and low GL on glycemic control and CVD risk factors in type 2 diabetes.
The study published on Diabetes Care was a parallel design, randomized trial wherein each 3-month treat- ment was conducted in a Canadian academic center between March 2011 and September 2012 and involved 141 participants with type 2 diabetes (HbA1c 6.5%– 8.5% [48–69 mmol/mol]) treated with oral antihyperglycemic agents. Participants were provided with dietary advice on either a low-GL diet with ALA and MUFA given as a canola oil–enriched bread supplement (31 g canola oil per 2,000 kcal) (test) or a whole-grain diet with a whole-wheat bread supplement (control). The primary outcome was HbA1c change. Secondary outcomes included calculated Framingham CVD risk score and reactive hyperemia index (RHI) ratio.
As a result, seventy-nine percent of the test group and 90% of the control group completed the trial. The test diet reduction in HbA1c units of 20.47% (25.15 mmol/mol) (95% CI 20.54% to 20.40% [25.92 to 24.38 mmol/mol]) was greater than that for the control diet (20.31% [23.44 mmol/mol] [95% CI 20.38% to 20.25% (24.17 to 22.71 mmol/mol)], P = 0.002), with the greatest benefit observed in those with higher systolic blood pressure (SBP). Greater reductions were seen in CVD risk score for the test diet, whereas the RHI ratio increased for the control diet.
In conclusion, a canola oil–enriched low-GL diet improved glycemic control in type 2 diabetes, particularly in participants with raised SBP, whereas whole grains improved vas- cular reactivity.

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