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Walnuts and Type 2 Diabetes

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A new epidemiological study representing more than 34,000 American adults suggests that those who consume walnuts may have about half the risk of developing type 2 diabetes compared to adults who do not eat nuts.1

According to the study from the University of California, Los Angeles (UCLA), the average intake among walnut consumers was approximately 1.5 tablespoons per day. Doubling walnut consumption (eating 3 tablespoons) was associated with a 47% lower prevalence of type 2 diabetes. Three tablespoons of walnuts is close to the recommended serving size of walnuts, which is one ounce or four tablespoons.

Researchers looked at data from the National Health and Nutrition Examination Survey (NHANES), which draws from a large sampling of the U.S. population. In this study, 34,121 adults ages 18-85 years old were asked about their dietary intake, as well as if they had been diagnosed with diabetes or if they were taking medications for diabetes. Individuals were also assessed for diabetes using common laboratory measurements including fasting plasma glucose and hemoglobin A1c.

Those who reported consuming walnuts showed a lower risk for type 2 diabetes compared to those who did not consume any nuts regardless of age, gender, race, education, BMI, and amount of physical activity.

Individuals with diabetes often have elevated blood pressure, cholesterol, or triglycerides, which can increase the risk for heart disease and stroke. Previous studies have examined the association between walnut consumption and cardiovascular health as well as diabetes. Findings from this study provide additional support for the role of walnuts as part of a healthy diet that may help reduce the risk for diabetes.

Among the numerous properties in walnuts that may be providing health benefits, walnuts are a rich source of recommended polyunsaturated fat (13 grams per ounce), which includes the plant-based omega-3 fatty acid alpha-linolenic acid (2.5 grams per ounce).

As with any scientific research, some study limitations should be considered. Participants were asked about their dietary choices over the course of one to two days, which may not be representative of usual consumption patterns. In addition, because of the cross-sectional nature of the study, the findings cannot prove causality.

Click here for more information about the role of walnuts in diabetes as well as simple and nutritious recipes.

Sources

1 Arab L, Dhaliwal SK, Martin CJ, et al. Association between walnut consumption and diabetes risk in NHANES [published online ahead of print June 21, 2018]. Diabetes Metab Res Rev. doi.org/10.1002/dmrr.3031

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