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Whole Grains, Bran Fiber and Diabetes
Over the last several years I've written plenty of articles about the positive effects of eating more fiber and whole grains. Eating more fiber can help adolescents reduce their risk of developing diabetes, while eating more fiber can help overweight adults lose more fat in their abdomen – which in and of itself is a risk factor for diabetes. Similarly, eating more whole grains, as opposed to more refined grains, seems to protect against higher fasting insulin scores – another indication of a risk of diabetes.
A Little More Fiber Can Help You Reduce Your Risk of Diabetes
More and more children and adolescents are considered overweight or even obese, leading to a related rise in the cases of insulin resistance, pre-diabetes, and type 2 diabetes among children. This is usually attributed to the amount of sugar in their diets combined with the poor quality carbohydrates they eat.
Carbohydrates and Diabetes
ome studies have linked high glycemic index (GI: how quickly a carbohydrate is absorbed) and high glycemic load (GL: the glycemic effect of carbs in the diet) with an increased risk of Type 2 diabetes. In Western diets, these foods include bread, potatoes, and sweet foods like desserts or sweetened soft drinks - a large portion of the typical Western diet.
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One of the first clinical signs of developing diabetes is what is known as "impaired glucose tolerance." Simply put: after a standard blood glucose test, those who have a blood glucose level that is higher than normal, but lower than that of a person with diabetes, are considered to have impaired glucose tolerance. This often appears in combination with insulin resistance, in which the cells do not respond to the release of insulin. When both of these effects reach a certain level the combination is known as "prediabetes." Over one-third of those with prediabetes progress to Type 2 diabetes within ten years.
The good news is that there are ways to help prevent prediabetes from progressing to full blown diabetes, including improved diet, regular exercise, and weight loss. We know that the best diet for those with Type 2 diabetes is a Mediterranean-style diet, and one component in particular - whole grains - has been extensively studied for its effects on those with prediabetes or Type 2 diabetes.
A recently published study in the American Journal of Clinical Nutrition (2013; 97:179-87) adds to the research on fiber and focuses specifically on both developing prediabetes and the progression from prediabetes to diabetes. In a study lasting over 8 years, researchers in Stockholm, Sweden analyzed the diets of over 5,000 men and women and compared the levels of intake of whole grains of those who developed prediabetes or progressed to type 2 diabetes with those who did not.
They found that as compared to those who ate an average of about 30 grams or less per day, those who averaged eating nearly 60 grams of whole grains per day were about one-third less likely to progress from normal glucose tolerance to prediabetes or from prediabetes to diabetes. Specifically, those who ate the most whole grains and had normal glucose tolerance at the start of the study were 27% less likely to develop prediabetes than those who ate the least. Those with prediabetes at the start of the study were 29% less likely to progress to diabetes.
It's easy to get more whole grains in your diet. For example: one 1/2-cup serving of cooked brown rice or 1 slice of 100% whole grain bread contains about 16 grams of whole grains. Here are some guidelines for getting better quality fiber - whole grains - in your diet: Practical Starch Choices.
First posted: January 16, 2013