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Relationship between carbohydrate and dietary fibre intake and the risk of cardiovascular disease mortality in Japanese: 24-year follow-up of NIPPON DATA80

Itsuko Miyazawa, Katsuyuki Miura, Naoko Miyagawa, Keiko Kondo, Aya Kadota, Nagako Okuda, Akira Fujiyoshi, Izumi Chihara, Yosikazu Nakamura, Atsushi Hozawa, Yasuyuki Nakamura, Yoshikuni Kita, Katsushi Yoshita, Tomonori Okamura, Akira Okayama, Hirotsugu Ueshima
European Journal of Clinical Nutrition 2019 April 8

BACKGROUND/OBJECTIVES: The association between carbohydrate intake and cardiovascular disease (CVD) risk has been investigated, but whether the quality of carbohydrate is more important than its amount is not known. We examined the associations between intake of dietary fibre (DF), carbohydrate, available carbohydrate, and starch with long-term CVD mortality in a Japanese population.

SUBJECTS/METHODS: We prospectively followed 8925 participants (3916 men and 5009 women) aged 30-79 years without CVD at baseline who participated in the National Nutrition Survey in Japan. Cox proportional hazards models were used to estimate multivariable-adjusted hazard ratios (HRs) and their 95% confidence intervals (CIs) for CVD mortality by quartiles of exposure variables.

RESULTS: During 24 years of follow-up, 823 CVD deaths were observed. In men, the multivariable-adjusted HR for CVD mortality was lower in the highest quartile of DF intake (HR: 0.64; 95% CI: 0.47-0.87; Ptrend  = 0.007) compared with the lowest quartile. This association was not significant in women. Multivariable-adjusted HR for total stroke mortality was lower in the highest quartile of DF intake (HR: 0.61; 95% CI: 0.38-0.98; Ptrend  = 0.046) compared with the lowest quartile in women. Carbohydrate, available carbohydrate, and starch intake were not associated with CVD mortality.

CONCLUSIONS: Higher intake of DF was associated significantly with a lower risk of CVD mortality in men and lower risk of stroke mortality in women. Intake of carbohydrate, available carbohydrate, and starch were not associated with the risk of CVD mortality in men or women.


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