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Soy Milk May Lower Glycemic Index of White Bread, Reduce Blood Sugar Spike

A recent study suggests that consuming rice bran-fortified soy milk along with a carbohydrate-rich meal may help improve glycemic control, and possibly help manage diabetes. The study examined the effect of drinking soy milk while eating white bread.



Participants in the study included 17 healthy Asian men with a BMI between 18.5 to 29 kg/m2. Over four separate occasions the men consumed white bread (twice) and white bread with two different soy milks that differed in protein and rice bran content. The researchers took blood samples to measure glucose and insulin response over three hours following consumption.



The glycemic index of white bread is 100. The researchers found that when it was co-ingested with rice bran soy milk, the glycemic index was 83.1 and with sugar-free soy milk it was 77.5. They also found that the glucose/insulin ratio of rice bran soy milk was 41.1 and of sugar free soy milk was 60.0. In comparison, the glycemic index of white bread alone was 123.5 during the first 30 minutes after consumption. 



Researchers from National University of Singapore conducted the study. It was published on April 4, 2018, in the journal Nutrients.



Previous studies have found that soy may reduce menopause symptoms, reduce bone loss and decrease the risk of prostate cancer. Soy protein can be found in tofu and soy milk.

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