(29-11-10) Rice intake and type 2 diabetes in Japanese men and women: the Japan Public Health Center-Based Prospective Study.

Nanri A, Mizoue T, Noda M, Takahashi Y, Kato M, Inoue M, Tsugane S; for the
Japan Public Health Center?based Prospective Study Group.

Department of Epidemiology and International Health, International Clinical
Research Center, National Center for Global Health and Medicine, Tokyo, Japan.
Abstract
BACKGROUND: Refined carbohydrates have been suggested to deteriorate glucose
metabolism; however, whether persons with elevated intakes of white rice, which
is a major staple food for the Japanese, experience increased risk of
developing type 2 diabetes remains unclear.

OBJECTIVE: We prospectively investigated the association between white rice
intake and risk of type 2 diabetes.

DESIGN: Participants were 25,666 men and 33,622 women aged 45-75 y who
participated in the second survey of the Japan Public Health Center-Based
Prospective Study and who had no prior history of diabetes. We ascertained food
intake by using a validated 147-item food-frequency questionnaire. Odds ratios
of self-reported, physician-diagnosed type 2 diabetes over 5 y were estimated
by using logistic regressions.

RESULTS: A total of 1103 new cases of type 2 diabetes were self-reported.
There was a significant association between rice intake and an increased risk
of type 2 diabetes in women; the multivariate-adjusted odds ratio for the
highest compared with lowest quartiles of rice intake was 1.65 (95% CI: 1.06,
2.57; P for trend = 0.005). In men, the association was unclear, although there
was a suggestion of a positive association in persons who were not engaged in
strenuous physical activity (P for trend = 0.08).

CONCLUSIONS: Elevated intake of white rice is associated with an increased
risk of type 2 diabetes in Japanese women. The finding that is suggestive of a
positive association of rice intake in physically inactive men deserves further
investigation.

Source:Am J Clin Nutr. 2010 Oct 27. [Epub ahead of print]

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