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White Rice, Brown Rice, and Risk of Type 2 Diabetes in US Men and Women
Qi Sun, MD, ScD;
Donna Spiegelman, ScD;
Rob M. van Dam, PhD;
Michelle D. Holmes, MD, DrPH;
Vasanti S. Malik, MSc;
Walter C. Willett, MD, DrPH;
Frank B. Hu, MD, PhD
Arch Intern Med. 2010;170(11):961-969.
Background Because of differences in processing and nutrients, brown rice and white rice may have different effects on risk of type 2 diabetes mellitus. We examined white and brown rice consumption in relation to type 2 diabetes risk prospectively in the Health Professionals Follow-up Study and the Nurses' Health Study I and II.
Methods We prospectively ascertained and updated diet, lifestyle practices, and disease status among 39 765 men and 157 463 women in these cohorts.
Results After multivariate adjustment for age and other lifestyle and dietary risk factors, higher intake of white rice ( 5 servings per week vs <1 per month) was associated with a higher risk of type 2 diabetes: pooled relative risk (95% confidence interval [CI]), 1.17 (1.02-1.36). In contrast, high brown rice intake (2 servings per week vs <1 per month) was associated with a lower risk of type 2 diabetes: pooled relative risk, 0.89 (95% CI, 0.81-0.97). We estimated that replacing 50 g/d (uncooked, equivalent to one-third serving per day) intake of white rice with the same amount of brown rice was associated with a 16% (95% CI, 9%-21%) lower risk of type 2 diabetes, whereas the same replacement with whole grains as a group was associated with a 36% (30%-42%) lower diabetes risk.
Conclusions Substitution of whole grains, including brown rice, for white rice may lower risk of type 2 diabetes. These data support the recommendation that most carbohydrate intake should come from whole grains rather than refined grains to help prevent type 2 diabetes.
Author Affiliations: Departments of Nutrition (Drs Sun, van Dam, Willett, and Hu and Ms Malik), Epidemiology (Drs Spiegelman, van Dam, Holmes, Willett, and Hu and Ms Malik), and Biostatistics (Dr Spiegelman), Harvard School of Public Health; the Channing Laboratory (Drs van Dam, Holmes, Willett, and Hu), Department of Medicine, Brigham and Women's Hospital and Harvard Medical School; all at Boston, Massachusetts.
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