Kentaro Murakami

Kentaro Murakami
The University of Tokyo | Todai · School of Public Health

PhD

About

170
Publications
19,115
Reads
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5,989
Citations
Citations since 2016
78 Research Items
4022 Citations
20162017201820192020202120220200400600
20162017201820192020202120220200400600
20162017201820192020202120220200400600
20162017201820192020202120220200400600
Additional affiliations
August 2016 - present
University of Tokyo
Position
  • Professor (Assistant)
April 2014 - July 2016
University of Shiga Prefecture
Position
  • Professor (Associate)
February 2012 - February 2014
University of Ulster
Position
  • Research Associate

Publications

Publications (170)
Article
The association between eating frequency (EF) and adiposity in young populations is inconsistent. This cross-sectional study examined associations of EF, meal frequency (MF) and snack frequency (SF) with adiposity measures in US children aged 6–11 years ( n 4346) and adolescents aged 12–19 years ( n 6338) participating in the National Health and Nu...
Article
Full-text available
We evaluated the accuracy of the estimated serving size using digital photographs in a newly developed food atlas. From 209 food items in the food atlas, we selected 14 items with various appearances for evaluation. At the study site, fifty-four participants aged 18–33 years were served fourteen foods in the amount they usually ate. After they left...
Article
The aim of this study was to examine the relative validity of the online Meal-based Diet History Questionnaire (MDHQ) for assessing the overall diet quality and quality of each meal type (breakfast, lunch, dinner, and snacks). In total, 222 Japanese adults (111 for each sex) aged 30–76 years completed the online MDHQ and then the 4-non-consecutive-...
Article
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The purpose of this study was to examine the relative validity of the Meal-based Diet History Questionnaire (MDHQ) for estimating nutrient intake. Dietary data were obtained from 111 Japanese women and 111 Japanese men, using the online MDHQ and the 4-non-consecutive-day weighed dietary record (DR). The number of nutrients (total n = 46) showing no...
Article
Full-text available
We examined the relative validity of food intake for each meal type (breakfast, lunch, dinner, and snacks) and overall food intake obtained through the Meal-based Diet History Questionnaire (MDHQ). In total, 222 Japanese adults (111 for each sex) aged 30–76 years completed the web version of the MDHQ and then the 4-non-consecutive-day weighed dieta...
Article
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The relationship between the intakes of saccharide subtypes and depressive symptoms is unclear in Asian countries. This cross-sectional study aimed to investigate this association among 3963 young (age of 18 years) and 3826 middle-aged (mean age of 47.8 years) Japanese women. The intakes of starch, total sugars, free sugars, sucrose, lactose, gluco...
Article
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This study aimed to develop a digital photographic food atlas as a portion size estimation aid. Commonly consumed foods were identified from the 5512-day weighed dietary records of 644 Japanese adults. Portion sizes were determined based on the market research and distribution of food consumption in the dietary records. Each food item was classifie...
Article
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Objective To identify temporal patterns of sleep and eating among school-aged children during school closure due to the COVID-19 pandemic and to examine their associations with lifestyle behaviours and dietary intake. Design In this cross-sectional study, questionnaires were used to assess sleep and eating times, lifestyle behaviours, and dietary...
Article
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This cross-sectional study of 2231 Japanese adults described food choice values and food literacy in relation to sex, age, and body mass index. We assessed eight food choice values (accessibility, convenience, health/weight control, tradition, sensory appeal, organic, comfort, and safety, using a 25-item scale), as well as food literacy, which was...
Poster
Full-text available
The lack of comprehensive food composition databases for sugar contents in Japanese foods has led to the lack of nutritional epidemiologic studies on sugar intake in Japanese population. This cross-sectional study aimed to investigate the association of free sugar intake estimated using a newly developed food composition database with the character...
Poster
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Recently, sugar contents of foods were reported for the first time in the Standard Table of Food Composition in Japan 2015 (STFCJ). However, only one third of food items included sugar contents with no data for added and free sugar. We therefore estimated habitual intakes for total, added and free sugar in Japanese adults after we developed a compr...
Article
Background and Aims To investigate the superiority of individualized dietary advice based on dietary assessment for patients with type 2 diabetes. Methods and Results A total of 136 Japanese adults with type 2 diabetes were randomized into either individualized or conventional dietary advice groups after dietary assessment using a self-administere...
Article
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Given the complex and varied nature of individual characteristics influencing dietary behaviors, personalized dietary advice may be more effective than generalized “one-size-fits-all” advice. In this paper, we describe a web-based personalized nutrition system for improving the quality of overall diet in the general adult population. The developmen...
Article
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Objective Although there is growing evidence suggesting that eating patterns are important determinants of health status, comprehensive information on patterning of eating behaviors is almost lacking. The aim of this cross-sectional study was to describe eating patterns in Japan. Design Information on actual eating behaviors was collected using 2-...
Article
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We identified dish-based dietary patterns for breakfast, lunch, and dinner and assessed the diet quality of each pattern. Dietary data were obtained from 392 Japanese adults aged 20–69 years in 2013, using a 4 d dietary record. K-means cluster analysis was conducted based on the amount of each dish group, separately for breakfasts (n = 1462), lunch...
Article
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Objective To examine the association between the amount of time spent at childcare and diet quality in 668 Japanese children aged 1·5–6 years. Design A cross-sectional design was used. Dietary information was collected using dietary records (1 d for children aged 1·5–2 years and 2 d for children aged 3–6 years). Diet quality was assessed by counti...
Article
Full-text available
Food frequency questionnaires, the primary method of dietary assessment in large-scale nutritional epidemiologic studies, preclude an informed evaluation of the timing of dietary intake and meal-specific dietary intake. In this study, we developed the Meal-based Diet History Questionnaire (MDHQ), a self-administered questionnaire designed for estim...
Article
Full-text available
Objective To characterise different meal types by examining the contribution of specific meals to the total intakes and the nutritional quality of each meal. Design A cross-sectional analysis was conducted based on dietary data collected using 4-d dietary record. Diet quality was assessed by the Healthy Eating Index-2015 and Nutrient-Rich Food Ind...
Article
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We evaluated the energy and nutrient intake estimates of popular Japanese diet-tracking mobile applications (apps). We identified five diet-tracking apps in the iTunes store during August 2020. A researcher entered the dietary data from a one-day paper-based dietary record (DR) previously obtained from apparently healthy free-living adults (15 male...
Article
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Objectives A growing number of Western studies have been exploring sustainable and healthy dietary patterns that target to reduce diet-related greenhouse gas emissions (GHGE) and to achieve nutritional needs. However, research is limited among Asian populations, where food sources for diet-related GHGE differ from those in Western populations. This...
Article
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Objective To summarise the existing evidence of development, validation and current status of utilisation of dish-based dietary assessment tools. Design Scoping review. Setting Systematic search using PubMed and Web of Science. Results We identified twelve tools from seventy-four eligible publications. They were developed for Koreans ( n 4), Ban...
Article
Full-text available
Epidemiological evidence on the association between eating frequency and overall diet quality does not represent a consistent picture. This cross-sectional study examined the associations of meal frequency and snack frequency with diet quality, using different definitions of meals and snacks. Based on 4-day weighed dietary record data obtained from...
Article
Many previous studies supported that shift of dietary choice is necessary to reduce environmental impact and achieve a healthy diet. However, inconsistent results have been shown for the association between the environmental impact of diet and its nutritional adequacy. The aim of this study was to investigate the association between environmental i...
Article
Background: The disparity of overall diet quality by personal educational attainment has been a public issue. However, it remains unknown which food groups contribute to the disparity. This cross-sectional study assesses which food groups explain associations between education and overall diet quality in Japanese women. Methods: A total of 3788 mid...
Article
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Objective To develop a greenhouse gas emissions (GHGE) database for Japanese foods using three different approaches, compare the results of estimated diet-related GHGE and determine major food contributors among Japanese adults. Design Cross-sectional. Three GHGE databases were developed: (1) a literature-based method including a literature review...
Article
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Objective This cross-sectional study evaluated the dietary characteristics of snacks, the contribution of snacks to daily nutrient intake and the association of energy intake (EI) from snacks with the prevalence of nutritional inadequacy in Japanese nursery school children. Design Foods and nutrients consumed in each eating occasion were assessed...
Article
In this study we hypothesized that spot urine can be used to predict protein intake at both group and individual levels. Participants (n 369) of this study were recruited from all 47 prefectures in Japan. Sex-specific formulas were developed based on the ratio of urea nitrogen to creatinine concentration obtained from three spot urine samples. Vali...
Article
Full-text available
Objectives While it is widely perceived that the diet consumed by Japanese is healthy, empirical evidence supporting this notion is limited. In this cross-sectional study, we assessed the overall diet quality of Japanese using the Healthy Eating Index-2015 (HEI-2015) and Nutrient-Rich Food Index 9.3 (NRF9.3), and compared diet quality scores betwee...
Article
Full-text available
We examined food combinations in relation to the quality of the overall diet and individual meals using a newly developed food combination questionnaire (FCQ) in a nationwide sample of Japanese adults aged 19–80 years (n = 2233). The quality of the overall diet and of each meal was assessed by the Healthy Eating Index-2015 (HEI-2015) and Nutrient-R...
Article
Objective We assessed the validity of a recently developed dish composition database (DCD) against urinary biomarkers compared with a standard food composition database (FCD). Design Intakes of protein, Na and K were estimated by 2 × 24 h urine collections and by 4 d dietary record data based on the DCD (including 128 dishes) or FCD (including 187...
Article
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We examined the reproducibility and relative validity of two measures of overall diet quality, the Healthy Eating Index-2015 (HEI-2015) and Nutrient-Rich Food Index 9.3 (NRF9.3), as estimated by well-established self-administered dietary assessment questionnaires for the Japanese, namely the comprehensive diet history questionnaire (DHQ) and the br...
Article
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Objective: Associations between the overall quality of Japanese diets and metabolic risk factors are largely unknown. This cross-sectional study investigated this issue using data from the 2012 National Health and Nutrition Survey, Japan. Methods: Dietary intake was assessed by a 1-day weighed dietary record in 15,618 Japanese adults aged ≥ 20 y...
Article
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Background: In Japan, large-scale epidemiological studies on starch and sugar intake are scarce, mainly due to a lack of a suitable assessment tool. We examined the relative validity of two widely-used dietary assessment questionnaires for Japanese adults: the comprehensive Diet History Questionnaire (DHQ) and the brief DHQ (BDHQ), for estimating t...
Article
Objective: To develop a dish composition database (DCD) and assess its ability to estimate dietary intake. Design: The DCD was developed based on 16 d dietary records (DR). We aggregated all reported dishes into 128 dish codes and calculated mean food group and nutrient contents for each code. These data were used to calculate dietary intake in a d...
Article
Glutamate is naturally present in various foods, such as many savory foods. Therefore, we hypothesized that dietary free glutamate comes from a variety of foods in the United States. The aims of this study were to develop a naturally-occurring free glutamate composition database, in addition to further estimate dietary intake and identify major foo...
Article
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Principal component analysis (PCA) has been widely used in nutritional epidemiology to derive dietary patterns. However, while PCA-derived dietary patterns are population-dependent, their reproducibility in different populations is largely unexplored. We aimed to investigate whether major dietary patterns are consistently identified among different...
Article
Full-text available
There is growing recognition that eating slowly is associated with a lower risk of obesity, and chewing well might be an effective way to reduce the eating rate. However, little is known about these relationships among children. We therefore investigated the associations of eating rate and chewing degree with weight status among 4451 Japanese child...
Article
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Data on the combination of foods consumed simultaneously at specific eating occasions are scarce, primarily due to a lack of assessment tools. We applied a recently developed meal coding system to multiple-day dietary intake data for assessing its ability to estimate food and nutrient intakes and characterise meal-based dietary patterns in the Japa...
Article
Full-text available
Background: The lack of comprehensive food composition databases for sugar contents in Japanese foods has led to the lack of nutritional epidemiologic studies on sugar intake in Japanese population. This cross-sectional study aimed to investigate the association of free sugar intake estimated using a newly-developed food composition database with t...
Article
Full-text available
We assessed breakfast in Japan using data from the 2012 National Health and Nutrition Survey. Dietary data were obtained from 1444 children (aged 6–11 years), 1134 adolescents (aged 12–17 years), 6531 younger adults (aged 18–49 years), and 13,343 older adults (aged ≥ 50 years), using a one-day weighed dietary record. Overall, 97% of participants re...
Article
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Due to a lack of a food composition database on starch and sugars, we developed a comprehensive database on starch and seven types of sugars in commonly consumed foods (n = 2222) in Japan. Dietary record data of 368 toddlers (aged 18–35 months), 376 preschool children (aged 3–6 years), 915 schoolchildren (aged 8–14 years) and 392 adults (aged 20–69...
Article
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Development and validation of a dish composition database for estimating food group and nutrient intake in Japan - Volume 77 Issue OCE4 - N. Shinozaki, K. Murakami, S. Masayasu, S. Sasaki
Conference Paper
Full-text available
Association of free sugar intake estimated using a newly-developed food composition database with lifestyles and parental characteristics among Japanese children aged 3–6 years: DONGuRI study - Volume 77 Issue OCE4 - A. Fujiwara, K. Murakami, K. Asakura, K. Uechi, M. Sugimoto, H. Wang, S. Masayasu, S. Sasaki
Article
Background There is increasing evidence of causal links between poor mastication and cognitive impairment, but possible effects of dietary hardness, which clearly affects mastication, on cognitive function is unknown. Objective We investigated the hypothesis that hardness of the habitual diet would be associated with cognitive function among older...
Article
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Objective: Epidemiologic evidence on the associations between dietary glycemic index (GI) and glycemic load (GL) and depressive symptoms is not only limited, particularly in Asian populations where dietary GI and GL are typically higher than in Western countries, but also inconclusive. This cross-sectional study examined these associations in Japa...
Article
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We assessed the adequacy of nutrient intakes of Japanese children aged 3–5 years. Dietary information was collected using a 3-nonconsective-day weighed dietary record among 143 boys and 143 girls. Estimates of usual nutrient intakes from foods and beverages were obtained using the best-power method. The proportions of children with intakes below an...
Article
Objective: Most studies on dietary patterns have focused on the total daily intake of foods without differentiating intake at specific eating occasions. The aim of this study was to identify meal-specific (breakfast, lunch, and dinner) dietary patterns and examine their contribution to overall dietary patterns, using data from the 2012 National He...
Article
Full-text available
We examined 13-year trends in dietary patterns, using data from the National Health and Nutrition Survey, Japan 2003–2015. In repeated, independent cross-sectional studies, dietary intake was assessed with a one-day weighed dietary record in 88,527 Japanese adults aged ≥20 years. Using principal component analysis based on the daily consumption of...
Article
Full-text available
Objective: Epidemiologic evidence on the potential effects of dietary acid load on frailty is lacking. This cross-sectional study examined the association between dietary acid load and frailty. Methods: This study was based on self-reported data obtained from 2176 Japanese women aged 65-94 years. Dietary acid load was characterized as potential...
Article
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Background/objectives: Both self-reported dietary information and urinary excretion have limitations in the assessment of phosphorus intake. We conducted a cross-sectional study to estimate dietary phosphorus intake by dietary records (DR) and 24-h urine collections (UC) and examined associated factors. Subjects/methods: A total of 161 men and 1...
Article
Objective: This cross-sectional study examined how the nutritional quality of meals and snacks was associated with overall diet quality and adiposity measures. Methods: Based on 7-d weighed dietary record data, all eating occasions were divided into meals or snacks based on time (meals: 06:00-09:00 h, 12:00-14:00 h, and 17:00-20:00 h; snacks: ot...
Article
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Background While the admittedly limited number of epidemiological findings on the association between diet-related greenhouse gas emissions (GHGE) and diet quality are not always consistent, potential influence of bias in the estimation of diet-related GHGE caused by misreporting of energy intake (EI) has not been investigated. This cross-sectional...
Article
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Background and objectives: Information on a whole array of characteristics associated with dietary misreporting in a representative sample in each country is still limited. Using data from the 2012 National Health and Nutrition Survey, Japan, we investigated the prevalence and characteristics of under- and over-reporting of energy intake among 19,...
Article
Full-text available
Development of a meal coding system for the identification of meal-based dietary patterns in Japan - Volume 76 Issue OCE4 - K. Murakami, M.B.E. Livingstone, S. Sasaki
Conference Paper
Full-text available
Estimation of total, added and free sugar intakes in Japanese adults using a newly developed food composition database - Volume 76 Issue OCE4 - A. Fujiwara, K. Murakami, K. Asakura, K. Uechi, S. Masayasu, S. Sasaki
Article
We investigated the hypothesis that the dietary glycemic index (GI) and glycemic load (GL) of Japanese children is associated with both favorable and unfavorable aspects of dietary intake. This cross-sectional study was based on 1-d weighed dietary record data from 3866 children in the 2012 National Health and Nutrition Survey, Japan. The GI of foo...
Article
Full-text available
Background: Studies examining meal and snack eating behaviors in relation to overall diet and health markers are limited, at least partly because there is no definitive consensus about what constitutes a snack, a meal, or an eating occasion. This cross-sectional study examined how nutritional quality of meals and snacks is associated with overall...
Article
Full-text available
Background: Most studies on dietary patterns to date have focused on the daily intake of individual foods, rather than the combination of foods simultaneously consumed during specific eating occasions (breakfast, lunch, dinner, and snacks). Objective: We aimed to establish a meal coding system for characterizing meal-based dietary patterns in Japan...
Article
Objective The aim of this study was to examine the dietary glycemic index (GI) and glycemic load (GL) of Japanese adults, as well as their nutritional correlates, in the 2012 National Health and Nutrition Survey, Japan. Method Dietary data from 15 618 adults aged ≥20 y, collected using a 1-d weighed dietary record, were analyzed. The GI of foods w...
Article
Epidemiologic evidence on the associations between dietary acid load and metabolic risk factors are limited and inconsistent. We investigated the hypothesis that dietary acid load is associated with adverse profiles of metabolic risk factors in Japanese adults. This cross-sectional study included 15 618 Japanese adults aged ≥20 y from the 2012 Nati...
Article
Full-text available
Only a few studies have focused on the association between overall diet, rather than intakes of individual nutrients or foods, and depressive symptoms in Japanese. This cross-sectional study examined associations between a diet quality score and depressive symptoms in 3963 young (age 18 years) and 3833 middle-aged (mean age 47·9 ( sd 4·2) years) Ja...
Article
Full-text available
Studies in many Western countries have consistently shown that monetary diet cost is positively associated with diet quality, but this may not necessarily be the case in Japan. This cross-sectional study examined the nutritional correlates of monetary diet cost among 3963 young (all 18 years old), 3800 middle-aged (mean age 48 years) and 2211 older...