The association between the incidence of urolithiasis and nutrition based on Japanese National Health and Nutrition Surv

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ORIGINAL PAPER

The association between the incidence of urolithiasis and nutrition based on Japanese National Health and Nutrition Surveys Takahiro Yasui • Atsushi Okada • Shuzo Hamamoto • Masahito Hirose Ryosuke Ando • Yasue Kubota • Keiichi Tozawa • Yutaro Hayashi • Bing Gao • Sadao Suzuki • Kenjiro Kohri



Received: 16 January 2013 / Accepted: 20 April 2013 / Published online: 30 April 2013 Ó Springer-Verlag Berlin Heidelberg 2013

Abstract To clarify the association between regional variations in urolithiasis incidence and nutrition intake, we evaluated associated data from Japanese national surveys. The incidence of urolithiasis in 12 regions of Japan was calculated from 2005 patient data obtained from 430 hospitals (n = 92,797). Nutrition intake data were obtained from the National Health and Nutrition Survey. We examined the association between urolithiasis incidence and average intake of various types of food or nutrients by region. Continuing surveys in Japan reveal fixed variations in urolithiasis incidence among geographic regions. The national average of patients with urolithiasis was estimated as 203.1 per 100,000 citizens. Regarding food, intake of fruit correlated negatively with the incidence of urolithiasis (r = -0.721, p = 0.008), while intake of eggs (r = 0.537, p = 0.072) and sugar (r = 0.475, p = 0.119) tended to positively correlate with incidence. Regarding nutrients,

T. Yasui (&)  A. Okada  S. Hamamoto  M. Hirose  R. Ando  Y. Kubota  K. Tozawa  Y. Hayashi  K. Kohri Department of Nephro-urology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan e-mail: [email protected] T. Yasui  B. Gao  K. Kohri China-Japan Kidney Stone Research Center, Shenyang Medical College, 146 Huanghe North Street, Shenyang 110034, China B. Gao Key Laboratory of Environment and Population Health of Liaoning Education Ministry, Shenyang Medical College, 146 Huanghe North Street, Shenyang 110034, China S. Suzuki Department of Public Health, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan

intake of potassium (r = -0.500, p = 0.098), vitamin K (r = -0.562, p = 0.057), and pantothenic acid (r = -0.560, p = 0.058) tended to negatively correlate with incidence. The incidence of urolithiasis is higher in geographic areas with populations having low fruit and high sugar intake. Keywords Urolithiasis  Urinary tract stone  Etiology  Nutrition  Nephrolithiasis

Introduction Urolithiasis is a common nephrologic disorder whose prevalence is increasing, likely due to lifestyle factors, including diet and obesity. Because urolithiasis is a complex disease, an understanding of the epidemiology, particularly of the interactions among different factors, may help lead to measures that reduce the risk of stone formation. Diet plays an important role in the pathogenesis of urolithiasis, and changes in dietary habits have likely contributed to the substantial increases in urolithia