Abstract
No earlier human study compared influences of canola and soybean oils on patients with type 2 diabetes (T2D). Current study aimed to investigate effects of canola and soya oils on blood and anthropometric parameters in overweight and obese Iranian diabetic (II) patients. A total of sixty-six T2D subjects were randomly allocated to three groups. Canola oil (CO; n 23, received 30g canola oil); Soya oil (SO; n 19, received 30g soya oil) and control group (n 24, their usual intake of dietary oils) for 8 weeks. Lipid and glycemic profiles as well as anthropometric indicators were evaluated before and after the intervention. Repeated-measures ANOVA was used to evaluate time×group interactions for the outcome variables followed by a t test (significance level, p < 0.05). After 8 weeks, serum total cholesterol (-21.3 and -36.4v. -2.2 mg/dl; P=0·007), low density lipoprotein (-6.6 and -15.9v. +3.0 mg/dl; P=0·013), fasting blood sugar (-39.6 and -30.5v. +11.7 mg/dl; P<0.001) significantly decreased and high density lipoprotein (+3.0 and +3.5v. +2.4 mg/dl; P=0.038) significantly increased in CO and SO groups compared with controls. Changes in lipid profiles were more considerable in the soybean oil group than the canola oil group. The mean changes of waist circumference (WC; −4.1 v. -1.4 and -1.3 cm; P=0·031) and weight (−3.1 v. -0.3 and +0.5 kg; P=0·048) significantly decreased in canola group comparing to the two other groups. Current study showed that daily consumption of canola and soybean oil for 8 weeks improved serum levels of fasting blood sugar, total cholesterol, low density lipoprotein and high density lipoprotein in T2D patients. Changes were more considerable in those consumed soybean oil. Canola oil decreased central obesity indices (waist circumference and weight) in T2D patients. Further studies are needed to shed light on this issue.
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