Nagako Okuda

Nagako Okuda
Kyoto Prefectural University · Graduate School of Life and Environmental Sciences

MD, PhD

About

163
Publications
12,180
Reads
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3,557
Citations
Additional affiliations
April 2014 - March 2016
University of Human Arts and Sciences
Position
  • Professor (Associate)
February 2012 - March 2014
National Institute of Health and Nutrition
Position
  • Manager
April 2007 - January 2010
Shiga University of Medical Science
Position
  • Special contract research associate
Education
April 1999 - April 2005
April 1983 - March 1987
Kyoto University
Field of study
  • Animal Science

Publications

Publications (163)
Article
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The aim of this study was to investigate the effect of the COVID-19 pandemic on regular clinic visits among people with diabetes and to elucidate the factors related to visit patterns among these patients during the pandemic. This was a longitudinal study using anonymized insurance claims data from the Joint Health Insurance Society in Tokyo from O...
Article
Aims/introduction: To examine the association between diabetes and prediabetes at baseline, and disability, mortality over a 22-year period among middle-aged Japanese adults. Materials and methods: Participants consisted of 1,788 adults aged 45-64 years at baseline from the cohort study National Integrated Project for Prospective Observation of...
Article
Objective: This study aimed to investigate the incidence rates and predictors of lower limb fractures in a general Japanese population. Methods: NIPPON DATA is a nationwide, long-term, prospective cohort study of individuals who participated in the National Cardiovascular Survey Japan and the National Nutrition Survey in 1990. Overall, 3,134 ind...
Article
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We aimed to evaluate the association between the milk consumption and incident stroke in a Japanese population, where milk consumption is lower than that of Western countries. In total, 14,121 participants (4253 men and 9868 women) aged 40–69 years, free from cardiovascular diseases (CVD) were prospectively followed for 10.7 years. Participants wer...
Article
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Background Lower socioeconomic status (SES) may be related to inactivity lifestyle; however, the association between SES and physical inactivity has not been sufficiently investigated in Japan. Methods The study population is the participants of NIPPON DATA2010, which is a prospective cohort study of the National Health and Nutrition Survey 2010 i...
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Background: It has been pointed out that prolonged television (TV) viewing is one of the sedentary behaviors that is harmful to health; however, the association between socioeconomic status (SES) and prolonged TV viewing time has not been sufficiently investigated in Japan. Methods: The study population are the participants of NIPPON DATA2010, w...
Article
Background Non-fasting triglycerides (TG) are considered a better predictor of cardiovascular disease (CVD) than fasting TG. However, the effect of non-fasting TG on fatal CVD events remains unclear. In the present study, we aimed to explore the relationship between non-fasting TG and CVD mortality in a Japanese general population. Methods A total...
Article
Several studies have reported a J-shaped relationship between alcohol consumption and coronary heart disease (CHD) risk. However, the mechanisms of this relationship remain unclear. This study aimed to evaluate the relationships of alcohol consumption with established CHD risk factors and with macro-/micro-nutrient intake among Japanese people. Par...
Article
Background:This study assessed sex-specific time-associated changes in the impact of risk factors on coronary artery disease (CAD) mortality in a general population over long-term follow-up. Methods and Results:A prospective longitudinal cohort study was conducted on representative Japanese populations followed up for 29 years. Data from 8,396 part...
Article
The clinical implications of alcohol consumption have been extensively examined; however, its effects on brain structures in apparently healthy community-dwellers remain unclear. Therefore, we investigated the relationship between alcohol consumption and brain grey matter volume (GMV) in community-dwelling Japanese men using voxel-based morphometry...
Article
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The consumption of red meat has been recommended for individuals with reduced kidney function. However, red meat intake was recently suspected to increase cardiovascular disease (CVD) risk. We evaluated the association of red meat intake with CVD mortality risk in Japanese with/without reduced kidney function. Overall, 9112 participants of a Japane...
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A lower-than-recommended potassium intake is a well-established risk factor for increased blood pressure. Although the Japanese diet is associated with higher sodium intake and lower potassium intake, few studies have examined the source foods quantitatively. Studies on dietary patterns in association with potassium intake will be useful to provide...
Article
Background: Major reasons for long-term care insurance certification in Japan are stroke, dementia and fracture. These diseases are reported to be associated with calcium intake. This study examined the association between calcium intake and impaired activities of daily living (ADL) using the data from NIPPON DATA90, consisting of representative sa...
Article
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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 CV...
Article
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Background Oral health is thought to be associated with diet quality, and socioeconomic status (SES) affects both oral health and diet. The aim of this study was to investigate the association between the number of teeth and dietary intake as well as nutritional biomarker, considering the subjects’ SES. Methods We conducted a cross-sectional analy...
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Abstract Background The gender-specific characteristics of individuals at an increased risk of developing depression currently remain unclear despite a higher prevalence of depression in women than in men. This study clarified socioeconomic and lifestyle factors associated with an increased risk of subclinical depression in general Japanese men and...
Article
In Asian countries, a major source of salt intake is from seasoning or table salt added at home. However, little is known about the adverse effects of salt intake evaluated according to household unit. We investigated the relationship between household salt intake level and mortality from all-cause and cardiovascular diseases (CVDs). Participants i...
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Healthy dietary habits are the cornerstone of cardiovascular disease (CVD) prevention. Numerous researchers have developed diet quality indices to help evaluate and compare diet quality across and within various populations. The availability of these new indices raises questions regarding the best selection relevant to a given population. In this p...
Article
Background: Several studies have reported that dietary salt intake may be an independent risk factor for overweight/obesity, but results from previous studies are controversial, reflecting study limitations such as use of a single spot urine or dietary recall to estimate daily salt intake rather than 24-h urine collections, and population samples...
Article
Background:Several cohort studies have demonstrated an association between socioeconomic status (SES) and health outcomes in Japan. As long-term employment is common in Japan, the size of the company may be related to cardiovascular disease (CVD) mortality risk. We examined the association of employment conditions with CVD mortality risk among work...
Article
Background:Many studies show that dietary factors such as vegetables, fruit, and salt are associated with cardiovascular disease (CVD) risk. However, a risk assessment chart for CVD mortality according to combinations of dietary factors has not been established. Methods and Results:Participants were 9,115 men and women aged 30–79 years enrolled in...
Article
Background: Dietary salt intake is associated with the risk of raised blood pressure and cardiovascular diseases (CVD). In Asian countries, a major source of salt intake is seasoning or table salt from cooking at home. However, little is known about the relationship between salt intake level of the entire household and CVD mortality risk. Objective...
Article
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Several studies demonstrated that visit-to-visit variability of blood pressure (BP) predicted future events of total death, stroke and cardiovascular disease. Little is known about factors associated with visit-to-visit BP variability in different countries. We recruited participants aged 40–59 years from four countries (Japan, the People’s Republi...
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Background: It has been reported that chronic inflammation may play an important role in the pathogenesis of several serious diseases and could be modulated by diet. Recently, the Dietary Inflammatory Index (DII®) was developed to assess the inflammatory potential of the overall diet. The DII has been reported as relevant to various diseases but ha...
Article
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Objectives Worksite‐based programs present a simple and effective approach to facilitate weight reduction in employees. Despite the importance of 1‐year weight loss maintenance, studies have generally focused on the short‐term effects of weight reduction programs. In addition, little is known about the long‐term weight maintenance outcomes in Asian...
Article
Background: In recent years, individuals with high serum total cholesterol (TC) have been more likely to modify their diet by reducing their intake of dietary lipids. The aim of this study was to investigate time-related changes in the relationships between the Keys score, dietary lipids, and TC between 1980 and 2010 in representative Japanese popu...
Article
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Objective: The present study aims to compare 24-h dietary recalls with 24-h urine collections for the estimation of sodium intake at both population and individual levels in China, Japan, the United Kingdom (UK), and the United States of America (USA), using data from the International Study of Macro- and Micro-nutrients and Blood Pressure (INTERM...
Article
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Background: Recently, high-density lipoprotein particles (HDL-P) have been found to be more strongly inversely associated with coronary artery disease (CAD) risk than their counterpart, HDL cholesterol (HDL-C). Given that lifestyle is among the first targets in CAD prevention, we compared the associations of HDL-P and HDL-C with selected lifestyle...
Article
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Aim: To examine the relationship between the intake of dietary vegetable protein and CVD mortality in a 15-year follow-up study of a representative sample of the Japanese population. Methods: A total of 7,744 participants aged 30 years or older (3,224 males and 4,520 females) who were free of CVD at baseline were included in this analysis. Vegetabl...
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Aim: The positive relationship between dietary cholesterol and serum cholesterol has been questioned by a set of recent cohort studies. This study aimed to investigate how employment status and education years relate to the association between dietary cholesterol and serum low-density lipoprotein cholesterol (LDL-C) in a Japanese population. Meth...
Article
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Background/objective: Egg intake was associated with serum total cholesterol adjusted for age (aTCH) and total mortality in women, but not in men, using data from NIPPON DATA (ND) 80 which followed up for 14 years. Re-evaluation of these associations in a different cohort is needed. Subject/methods: We analyzed the associations of egg intake wit...
Article
Introduction: The Dietary Approaches to Stop Hypertension (DASH) eating pattern is widely used for lowering blood pressure in the United States. Food preference and intake volume are quite different among American and Japanese diet; therefore, it is necessary to develop a modified version of DASH dietary pattern for Japanese people (JDASH). Hypothe...
Article
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Background: The relationship between socioeconomic status (SES) and knowledge of cardiovascular risk factors remains unknown in a general Japanese population. Methods: Of 8,815 participants from 300 randomly selected areas throughout Japan, 2,467 participants who were free of cardiovascular disease and who provided information on SES in the Nati...
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Background: The relationships among socioeconomic status and lifestyle improvements have not yet been examined in a representative Japanese population. Methods: We analyzed data from 2,647 participants (1,087 men and 1,560 women) who participated in NIPPON DATA2010. This survey inquired about lifestyle improvements and socioeconomic status. Educ...
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Background: Most studies on socioeconomic inequalities in oral health have not considered the effects of behavioral and biological factors and age differences. Furthermore, the nationwide status of inequalities remains unclear in Japan. Methods: We analyzed data from 2,089 residents aged ≥40 years throughout Japan. The lowest quartile of the num...
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Background: This study investigated relationships among socioeconomic factors and participation in health examinations for Japanese National Health Insurance (NHI) using a representative Japanese population. Methods: We used the linkage database of NIPPON DATA2010 and Comprehensive Survey of Living Conditions 2010. Participants with NHI aged 40-...
Article
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Background: The structure and risk factors for cardiovascular diseases (CVD) in Japan may change because lifestyle, particularly nutrition, socioeconomic status, and medical care, which affect CVD, may markedly change over time. Therefore, a new prospective cohort study on a representative general Japanese population based on national surveys is r...
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Background: Long-term passive exposure to cigarette smoke has been reported to affect the health of non-smokers. This study aims to investigate the relationships among socioeconomic factors and passive smoking at home in the non-current smokers of a representative sample from a general Japanese population. Methods: Data are from NIPPON DATA2010....
Article
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Background: A lower socioeconomic status (SES) may be related to the intake of unhealthy food; however, this relationship has not been examined in detail. This study was undertaken to examine relationships among food group intakes and SES in a representative Japanese population. Methods: This was a cross-sectional study using the baseline data o...
Article
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Background: Although socioeconomic status (SES) may affect food and nutrient intakes, few studies have reported on sodium (Na) and potassium (K) intakes among individuals with various SESs in Japan. We investigated associations of SES with Na and K intake levels using urinary specimens in a representative Japanese population. Methods: This was a...
Article
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Background: This study examined the relationships among household income, other SES indicators, and macronutrient intake in a cross-sectional study of a representative Japanese population. Methods: In 2010, we established a cohort of participants in the National Health and Nutrition Survey (NHNS) from 300 randomly selected areas throughout Japan...
Article
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Background: The distributions of socioeconomic status (SES) factors have been changing in Japan. We examined the relationships among SES and self-rated health (SRH) in Japanese adults. Methods: We analyzed 1,178 men and 1,555 women. We showed the distribution of SRH by sex and age and examined cross-sectional relationships among educational atta...
Article
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Background: Socioeconomic status (SES) imbalances in developed and developing countries may result in individuals being overweight and obese. However, few studies have investigated this issue in Japan. We herein examined the relationship between SES and being underweight, overweight or obese according to sex and age groups (20-64 or ≥65 years) in...
Article
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Aim: To investigate associations between socioeconomic status (SES) and the prevalence and treatment status of hypercholesterolemia in a general Japanese population. Methods: In 2010, we established a cohort study of 2417 adults (age 20-91 yr) from 300 randomly selected areas across Japan who participated in the National Health and Nutrition Sur...
Article
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This study was performed with subjects who received active support including specific health guidance, with the aim of clarifying the effects of changes in lifestyle on weight loss. The results are based on the answers that they provided in standard questionnaires before and after the support intervention. The subjects included 4,318 males and 810...
Article
Aim: We investigated whether 2 types of personalized health guidance (repeated and single counseling) in the Japanese nationwide cardiovascular prevention system promoted smoking cessation among smokers. Methods: The study included 47,745 Japanese smokers aged 40 to 74 years classified into 2 personalized health guidance schemes. After a 1-year...
Article
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Aim: There is a growing need for nutritional education for prevention and non-pharmacological treatment of risk factors for cardiovascular diseases (CVD). We compared the results of a short dietary propensity questionnaire (SDPQ) with those from the food frequency and quantity survey (FF Quantity), which had been previously quantitatively assessed...
Article
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Purpose: It is often reported that Na intake levels are higher in Japan than in western countries. Detailed analysis of food intake and its association with Na intake are necessary for supporting further decreases in Na consumption in Japan. We investigated the association between Na and food intake by food group using data from the Japanese parti...
Article
Background: Immigration studies reported that dyslipidemia is more prevalent in people living in a western lifestyle. However, it is not clear what kind of lifestyle and dietary factors contribute to this difference. Aim: To investigate whether lifestyle including dietary factors could explain the difference in serum lipids between Japanese in Japa...
Article
Aims: The association between carbohydrate intake and cardiovascular disease (CVD) risk has been investigated; however, it remains unclear. Carbohydrate quality is considered to be more important than its amount. Carbohydrate consists of fiber and available carbohydrate which includes starch and sugar. The aim of this study was to examine the relat...
Article
Introduction: The upper limit of recommended dietary cholesterol has been abolished recently from guidelines in Japan and US even though high intake is known to increase serum cholesterol levels. Reverse causality has been involved, reflecting availability of widespread information with consequent lifestyle modifications among knowledgeable people....
Article
Aim: The National Health and Nutrition Survey, Japan, has annually monitored two indicators of physical activity in adults. They are contrasting in the association with age; the prevalence of exercise habit is lower and step counts are higher among younger participants. The present study aimed to examine the effects of rapid aging of the Japanese...
Article
Background and objectives: Total fat intake is linked to the intake of other nutrients. Little data are available on the extent to which total fat affects diet quality in Japanese people. We investigated the relationship between total fat intake and other nutrient intake using INTERLIPID/ INTERMAP data on Japanese people living in Japan. Methods...
Article
Background & aim: Although dietary soy intake is linked with health benefits, a relation with stroke has not been established. The present study examined the association between the intake of tofu, the richest source of dietary soy, with stroke mortality in a general population cohort of Japanese men and women. Methods: Data comprise 9244 Japane...
Article
Background: Studies have shown significant associations of chronic kidney disease (CKD) and diabetes mellitus (DM) with cardiovascular disease (CVD) mortality. The impact on the general population is an important public health issue. However, the population attributable fraction (PAF) of CVD because of CKD and/or DM in a general population is unce...
Article
Objective: To investigate associations between socioeconomic status (SES) and prevalence, awareness, treatment, and control of hypertension in Japan's general population. Methods: In 2010, we established a cohort of participants in the National Health and Nutrition Survey of Japan. The cohort included 2623 adults from 300 randomly selected areas...
Article
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Background: Epidemiologic evidence suggests that relationships of red meat consumption with risk of cardiovascular diseases depends on whether or not the meat is processed, including addition of preservatives, but evidence is limited for blood pressure (BP). Objective: To examine cross-sectional associations with BP of unprocessed and processed...
Article
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Objectives To evaluate the impact of dietary sodium and potassium (Na–K) ratio on mortality from total and subtypes of stroke, cardiovascular disease (CVD) and all causes, using 24-year follow-up data of a representative sample of the Japanese population. Setting Prospective cohort study. Participants In the 1980 National Cardiovascular Survey, p...
Article
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Aims: The long-term prognostic effect of non-specific 12-lead electrocardiogram findings is unknown. We aimed to evaluate the cumulative prognostic impact of axial, structural, and repolarization categorical abnormalities on cardiovascular death, independent from traditional risk scoring systems such as the Framingham risk score and the NIPPON DAT...
Data
Impact of the Individual Abnormal ECG Category on All-Cause and Cardiovascular Death in Men. (DOCX)
Data
Impact of the Individual Abnormal ECG Category on All-Cause and Cardiovascular Death in Women. (DOCX)
Data
Men’s Distribution According to FRS and NDRC. A. Distribution of the Framingham Risk Score in Men B. Distribution of the Framingham Risk Score in Men. (TIF)