Guardians' food literacy and breakfast skipping among Japanese school children.

Children and adolescents who regularly skip breakfast are at a greater risk of obesity than those who regularly eat breakfast. Guardian's food literacy, defined in this study as a collection of a guardian's knowledge, skill, and attitude towards healthy food practices, may directly influence their child's dietary habits. Thus, this study utilized a food literacy scale to assess the relationship between guardians' food literacy and breakfast skipping among school-attending Japanese children and adolescents and the most commonly reported reasons for skipping breakfast. This was a cross-sectional study using survey data collected from a nationally representative sample of households in Japan (n = 1520). Our results show that 13.0% of children self-reported skipping breakfast at least once a week. Children in households where guardians reported higher knowledge and attitude scores had significantly lower odds of skipping breakfast (odds ratios = 0.90 [95% confidence interval: 0.83-0.98] and 0.81 [0.74-0.90], respectively). These findings suggest that a guardian's attitude and knowledge towards healthy food practices influence the frequency at which their child eats breakfast. Moreover, lower parental attitude scores were associated with children skipping due to not having enough time for breakfast in the morning. Improving guardians' food literacy may provide an avenue by which to decrease the rate of breakfast skipping among children and adolescents, thereby decreasing the risk of obesity and other adverse health outcomes.

[Evaluation of the relationship between household economic situation and food group intake in children attending nursery school].

Objectives　The relationship between household income and dietary intake among older children and adults in Japan has been studied. However, few studies have examined the relationship in younger children, and we believe that this should be taken into consideration from early childhood to correct health disparities. In this study, we examined the relationship between family income and dietary food group intake, and investigated the adequacy of food intake based on the Japanese Food Guide Spinning Top for young children aged 3 to 6 years attending nursery school. The goal of this study was to obtain trends in food intake that can be used to improve poor dietary intake of young children caused by socioeconomic factors.Methods　A dietary survey using the food weighing or recording method and a self-administered questionnaire on dietary status were conducted on two non-consecutive days, including weekdays and weekends, from October to December 2019 or 2020. The participants were 761 young children (423 boys and 338 girls) attending nursery schools in seven cities in Japan. Equivalent income was calculated from household income and the number of family members indicated in the dietary status survey. Intake of each food group and consistency with the Japanese Food Guide Spinning Top were compared in five quintiles.Results　Compared to the low equivalent income group, the high equivalent income group showed a decreasing trend in cereal intake and an increasing trend in the intake of sugar and sweeteners, green and yellow vegetables, and dairy products. The percentage of the low-income group who did not meet the definition of adequate intake using the Japanese Food Guide Spinning Top was lower for meals that include cereals and grain products, and higher for meals that include meat and fish, vegetable, milk and dairy products, and fruits.Conclusion　The lower income group had higher intake of cereals and lower intake of vegetables and fruits compared to the higher income group. This finding is similar to the results of studies in adults and older children. However, based on the Japanese Food Guide Spinning Top, >90% of young children have a diet that fall below the adequate intake of meals, including vegetable dishes and even on weekdays, which suggests a general vegetable deficiency in young children. Multifaceted support is required to address this concern, including measures to correct disparities of income and to ensure desirable nutrient intake in early childhood.

Japanese school children's intake of selected food groups and meal quality due to differences in guardian's literacy of meal preparation for children during the COVID-19 pandemic.

In 2020, a state of emergency (SOE) was enforced by the Japanese government, which included temporary school closures with the aim of overcoming COVID-19 spread, which prevented access to school lunches. We evaluated the relationship between meal quality and guardians' literacy of meal preparation for a nationally representative sample of 1107 Japanese schoolchildren (aged 10-14 years) before, during, and after the SOE on the basis of 7 questions scored using a 5-point Likert scale. The guardians' literacy of meal preparation for children was divided into quartiles, with Q1 and Q4 including participants with the lowest and highest scores on food literacy, respectively. School lunch menu was handed out monthly to each household by their classroom teacher. The consumption of (i) meat, fish, or eggs and (ii) vegetables at least twice a day indicated "well-balanced dietary intake", which was less frequent in all four quartiles, especially for Q1 and Q2, during compared to before the SOE. The relative risk increases (95% CI) were Q1: -40.6% (-41.4% to -39.8%; p < 0.001), Q2: -34.0% (-34.7% to -33.3%; p < 0.001), Q3: -13.1% (-13.8% to -12.4%; p < 0.001), and Q4: -15.3% (-16.0% to -14.7%; p < 0.001), adjusted for sex, age, BMI, equivalent income adjusted for the number of household members, and educational level of parents. The interaction p was <0.001 for Q1-3 vs. Q4. Guardians with low total scores were significantly more likely to have less time, mental capacity, and financial ability to prepare meals after the SOE. Therefore, schoolchildren's meal quality deteriorated during the SOE, particularly among those with guardians with low food literacy even after adjustment for household income level and guardians' educational level.

[Management of healthy food environment improvement through restaurants and other settings by prefectures and cities of cabinet order].

Objectives　In Japanese nutrition policy, emphasis is placed on healthy food environment improvement through restaurants and other settings by prefectures and cities of cabinet order (cities). This study aimed to clarify the actual status of management implementation by prefectures and cities.Methods　A mail survey of 47 prefectures and 106 cities throughout Japan was conducted in October 2020. Management implementation, including the existence of a healthy food environment improvement system (system) for restaurants and other settings, was confirmed. Local governments that had implemented the system were asked about the scope, dissemination efforts, process evaluation, and improvement of the system.Results　Of the local governments that responded, 39/42 prefectures (92.9%) and 57/82 cities (69.5%) implementing the system were included in the study. A total of 84.6% of prefectures and 14.0% of cities assessed the nutrient intake of local residents within the past five years. The median number of dietitians in the main office of the department in charge of healthy food environment improvement was two in both prefectures and cities. A target for healthy food environment improvement was set by 69.2% of prefectures and 54.4% of cities. The scope of the system was restaurant meals for 94.9% of prefectures and 100.0% of cities as well as ready-made meals for 87.2% of prefectures and 93.0% of cities. A total of 69.2% of prefectures and 66.7% of cities collaborated internally or with other local governments, while 15.4% of prefectures and 15.8% of cities entrusted system dissemination to external organizations. A total of 87.2% of prefectures and 89.5% of cities assessed the number of registered stores/companies, while 17.6% of prefectures and 21.6% of cities assessed the number of restaurants and other settings in the entire jurisdiction. A total of 33.3% of prefectures and 40.4% of cities established a renewal system, while 71.8% of prefectures and 33.3% of cities improved the system.Conclusion　Although underreporting due to the COVID-19 pandemic is possible, in local governments that had implemented the system, few cities assessed nutrient intake, and approximately 50-70% of prefectures and cities set targets for healthy food environment improvement. While approximately 90% of each local government assessed the number of registered stores/companies, those that assessed the number of stores/companies in the entire jurisdiction as a population size were approximately 20%. Approximately 30-40% of each local government has established a renewal system.

Dietary diversity score correlates with nutrient intake and monetary diet cost among Japanese adults.

BACKGROUND AND OBJECTIVES: Dietary diversity is an indicator of diet quality. Dietary diversity has been suggested to result in good nutrient intake, but it can affect dietary cost. We examined whether dietary diversity correlates with nutrient intake and monetary diet cost. METHODS AND STUDY DESIGN: We used data for 3985 individuals (age range: 20-64 years) from the 2014 Japan National Health and Nutrition Survey (NHNS). Dietary diversity was assessed using the food variety score (FVS; the number of foods) and dietary diversity score (DDS; the number of food groups, range: 1-14). Mean energy and nutrient intake from NHNS, and diet cost from the National Retail Price Survey were compared among FVS quartiles using the Kruskal-Wallis test, and between 2 groups with median DDS using the Mann-Whitney U test. RESULTS: Mean (SD) FVS and DDS per day were 22.3 (7.2) and 9.8 (2.0), respectively. For most nutrients, intake per 4184 kJ was relatively high when FVS was high (p<0.001); however, carbohydrate intake was relatively high in the low-FVS group (p<0.001). For all nutrients with significant differences, intake was higher in the group with high DDS (≥10). Monetary diet cost was higher in the high-FVS and DDS groups compared with the low groups (p<0.001). CONCLUSIONS: Intake of a variety of food and food groups resulted in higher intake of various nutrients as well as higher monetary diet cost. Additionally, care should be taken to avoid excessive intake of nutrients such as sodium and SFA that may result from diverse diets.

Household income is associated with food and nutrient intake in Japanese schoolchildren, especially on days without school lunch.

OBJECTIVE: The present study aimed to examine the association between household income and the intake of foods and nutrients by Japanese schoolchildren, and any differences between days with and without school lunch. DESIGN: This was a cross-sectional study. Children, with the support of their parents, kept dietary records with photographs for 4 d (2 d with school lunch and 2 d without). The socio-economic status of each family was obtained from a questionnaire completed by the parents. SETTING: Japan. SUBJECTS: All students in 5th grade (10-11 years old) at nineteen schools in four prefectures and their parents (1447 pairs of students and parents) were invited to take part in the study; 836 pairs of complete data sets were analysed. RESULTS: The average results of four days of dietary records showed that lower income level was associated with a lower intake of fish/shellfish, green vegetables and sugar at the food group level, a lower intake of protein and several micronutrients, and a higher energy intake from carbohydrates at the nutrient level among the children. These associations between income and food/nutrient intake were not significant on days with school lunches, but were significant on days without school lunch. CONCLUSIONS: Our study confirmed an association between household income and the amount of foods and nutrients consumed by Japanese schoolchildren, and suggested that school lunches play a role in reducing disparities in the diets of children from households with various incomes.

[Relationship between dietary diversity and food access among elderly living alone in Saitama Prefecture].

OBJECTIVES: To examine the relationship between dietary diversity and food access among elderly living alone. METHODS: In September 2013, a cross-sectional study using a self-administered questionnaire was conducted with 4,348 elderly aged 65-89 years, living in A city in Saitama Prefecture. The subjects answered about their health conditions, frequency of food consumption, difficulty of food store access, social support, food preparation, and so on. The response rate was 59.6%. The dietary diversity score (DDS) was calculated as the number of food groups consumed in a day (0 to 10). The DDS was validated by its association with independence and health status of the elderly. As indicators of food access, objective food access was measured using a geographic information system (GIS), and subjective food access was measured by the questionnaire. Responses of 1,043 subjects (452 male and 591 female) were analyzed after excluding those who live with others in an actual household composition. We classified the subjects into two groups according to the DDS: low group (three or less) and high group (four or more). Multiple logistic regression analyses were conducted using the DDS groups as the dependent variable, and subjective food access and other factors as independent variables, adjusting for age, income, subjective economic status, education, and frailty status. RESULTS: The number of subjects in each group were as follows: low=107 (23.7%), high=345 (76.3%) for males, high=263 (44.5%), low=328 (55.5%) for females. A multiple logistic regression analysis showed that the difficulty in subjective food store access was associated with a low DDS in males [OR=4.00, 95% CI (1.36-11.82)] as well as in females [OR=2.24, 95% CI (1.11-4.51)]. Further, for females, social support and preparation of supper by oneself were significantly associated with their DDS. No significant relationships were found between objective food store access and DDS in both males and females. CONCLUSION: The DDS was strongly associated with subjective food store access among the elderly living alone. For females, social support and meal preparation skills were also suggested as important factors affecting their DDS.

[Survey of obesity and underweight among inpatients with schizophrenia in psychiatric hospitals throughout Japan].

AIM: Many studies have reported a high prevalence of obesity in patients with schizophrenia compared to the general population. However, no nationwide survey of schizophrenic inpatients has been conducted in Japan. The aims of this study were to conduct a large-scale survey of BMI among hospitalized patients with schizophrenia in Japan, identify the prevalence of obesity and underweight, and examine its associated factors. METHODS: This was a cross-sectional study. The subjects were 14,591 schizophrenic inpatients (7,645 males and 6,946 females) with complete data from 89 facilities in Japan that agreed to participate in this study. Survey items included age, gender, height, weight, BMI, length of hospital stay, antipsychotic agents, and types of hospital ward, and the survey took place between July to December 2010. RESULTS: When the BMI distribution was compared between the general adult population and patients, the rate of obesity was 26.1% in the general adult population and 21.9% in the patients, being lower among the patients, and the rate of underweight was 7.0% in the general adult population and 19.5% in the patients, being 2.8 times higher among the patients. Subsequently, logistic regression was used to examine factors associated with obesity and underweight. As the results, the obesity odds ratio was 1.32 times higher in patients in their 30s than in their 20s, 1.31 times higher in females than males, 0.62 times higher with a > or = 1-year hospital stay than < 3-month stay, 1.42 times higher in patients receiving > or = 4 antipsychotic agents than those receiving single typical agents, and 0.58 times higher in patients kept in a locked ward than those in an open ward. The underweight odds ratio was 2.03 times higher in patients in their > or = 70s than in their 20s, 1.18 times higher in females than males, 1.47 times higher with a 3-month < 1-year hospital stay than < 3-month stay, 0.7 times higher in patients receiving > or = 4 antipsychotic agents than those receiving single typical or atypical agents, and 1.81 times higher in patients kept in a locked ward than those in an open ward. CONCLUSIONS: Obesity in Japanese schizophrenic inpatients was associated with < 3-month hospitalization, antipsychotic polypharmacy, and an open ward, whereas underweight was associated with > or = 3-month hospitalization, the administration of single typical or atypical antipsychotic agents, and a locked ward, independent from age and gender.

[Assessment of the validity and reliability of the processes of change scale based on the transtheoretical model of vegetable consumption behavior in Japanese male workers].

OBJECTIVES: A core construct of the Transtheoretical model is that the processes and stages of change are strongly related to observable behavioral changes. We created the Processes of Change Scale of vegetable consumption behavior and examined the validity and reliability of this scale. METHODS: In September 2009, a self-administered questionnaire was administered to male Japanese employees, aged 20-59 years, working at 20 worksites in Niigata City in Japan. The stages of change (precontempration, contemplation, preparation, action, and maintenance stage) were measured using 2 items that assessed participants' current implementation of the target behavior (eating 5 or more servings of vegetables per day) and their readiness to change their habits. The Processes of Change Scale of vegetable consumption behavior comprised 10 items assessing 5 cognitive processes (consciousness raising, emotional arousal, environmental reevaluation, self-reevaluation, and social liberation) and 5 behavioral processes (commitment, rewards, helping relationships, countering, and environment control). Each item was selected from an existing scale. Decisional balance (pros [2 items] and cons [2 items]), and self-efficacy (3 items) were also assessed, because these constructs were considered to be relevant to the processes of change. The internal consistency reliability of the scale was examined using Cronbach's alpha. Its construct validity was examined using a factor analysis of the processes of change, decisional balance, and self-efficacy variables, while its criterion-related validity was determined by assessing the association between the scale scores and the stages of change. RESULTS: The data of 527 (out of 600) participants (mean age, 41.1 years) were analyzed. Results indicated that the Processes of Change Scale had sufficient internal consistency reliability (Cronbach's alpha: cognitive processes=0.722, behavioral processes=0.803). The processes of change were divided into 2 factors: "consciousness raising, emotional arousal, environmental reevaluation, self-reevaluation, commitment, rewards, helping relationships, and social liberation" and "countering and environment control" in the factor analysis. Moreover, each construct--the processes of change, decisional balance, and self-efficacy--could be classified into different factors. The scores for cognitive processes were higher in the contemplation and preparation stages than in the precontemplation stage (P<0.05). Scores for behavioral processes increased from the precontemplation stage to the preparation stages (P<0.05), and were higher in the action + maintenance stage than in the precontemplation stage (P< 0.05). CONCLUSION: For male workers, the Processes of Change Scale has sufficient validity and reliability, as demonstrated by the internal fitness and the construct and criterion-related validity of the scale found in this study.

Effects of Socioeconomic Status on Nutrition and Nutrition Policy Studies in Asia.

Many studies in Western countries have reported that people with low socioeconomic status (SES) have a greater risk of obesity and non-communicable diseases. However, the relationship between SES and nutrition is considered to differ from country to country among Asian countries. Based on studies since 2010, the nutritional status of populations with low SES can be summarized as follows. In India, undernutrition among children and women has been reported. In China, low energy and nutrient intakes and undernutrition are common among children and the elderly, while both obesity and undernutrition are common in adults. In Japan and Korea, weight faltering in preschool children, low dietary quality among groups from school children to adults, and high obesity among adolescents and adult women have been reported. There are two types of policies aimed at reducing nutrition disparities: approaches for population and those for households with low SES. Nutrition disparities due to SES disparities in Asia need to be monitored. In Asia, studies on nutrition policy have focused on cash subsidies and food assistance for low SES households with the aim of improving undernutrition, but food environment measures for the population as a whole also need to be studied in order to reduce under- and over-nutrition, the double burden of malnutrition.

Convenience Food Options and Adequacy of Nutrient Intake among School Children during the COVID-19 Pandemic.

The COVID-19 pandemic has caused changes in the family food environment, resulting in more families relying on convenience food options. This study aimed to investigate diet quality by convenience food options (namely instant, frozen, and take-out foods) among Japanese school children during the COVID-19 pandemic. We examined the relationship between the frequency of consumption of convenience food options and nutritional status of the school children. The participants (671 children, 10-14 years old) were chosen to form a nationally representative sample of the Japanese population. Using questionnaires completed by the participants' guardians, information was collected on the frequency of instant, frozen, and take-out food consumption. Habitual food and nutrient intake were collected using a validated food frequency questionnaire, completed by the children with help from their guardian(s). "Frequent" consumption was defined as consumption of instant, frozen, and/or take-out foods on more than 5 days per week. Using 19 nutrients and their respective dietary reference intake (DRI) values, an index was created to label each child's nutrient intake as "Adequate", "Inadequate", "Excess", or "Deficient." Compared to children with non-frequent consumption, school children with frequent instant food consumption had significantly higher rates of inadequate nutrient intake (risk ratio (RR) = 3.0 [95% CI: 1.6-5.6]) and excess nutrient intake (RR = 2.3 [95% CI: 1.3-4.2]), while school children with frequent take-out food consumption had significantly higher rates of inadequate nutrient intake (RR = 2.1 [95% CI: 1.3-3.3]). There were no significant differences for children with frequent frozen-food intake. These associations did not change when adjusting for sociodemographic factors. Our results suggest that the frequent consumption of instant or take-out foods among school children results in non-adequate nutritional intake.

[Development and evaluation of the reliability and validity of an empowerment scale for health promotion volunteers].

OBJECTIVES: This qualitative and quantitative research was conducted to develop an empowerment scale for health promotion volunteers (hereinafter referred to as the ESFHPV), key persons responsible for creating healthy communities. METHODS: A focus group interview was conducted with four groups of health promotion volunteers from two cities in S Public Health Center of N Prefecture. A qualitative analysis was employed and a 32-item draft scale was created. The reliability and validity of this scale were then evaluated using quantitative methods. A questionnaire survey was conducted in 2009 for all 660 health promotion volunteers across the 2 cities. Of 401 respondents (response rate, 60.8%), 356 (53.9%) provided valid responses and were thus included in the analysis. RESULTS: 1) Internal consistency was confirmed by item-total correlation analysis (I-T analysis), assessment of Cronbach's coefficient alpha for all except one item and good-poor analysis (G-P analysis). Four items were excluded from the 32-item draft scale because of correlation coefficients more than 0.7, leaving 28 items for analysis. 2) Based on the results obtained from the factor analysis performed on the 28 provisional empowerment questions, 28 items were chosen for inclusion in the ESFHPV. These items consisted of four sub-scales, namely 'activity for healthy community' (10 items), 'intention for solving health problems of the community' (10 items), 'democratic organization activity' (four items) and 'growth as individual health promotion volunteers' (four items). 3) The Cronbach's coefficient alpha for the ESFHPV and its four sub-scales were 0.93, 0.88, 0.89, 0.84 and 0.79 respectively. The coefficients of I-T analysis were between 0.33 and 0.69. 4) The health promotion volunteers who attended other community activities demonstrated significantly high scores for the ESFHPV and the four sub-scales. Persons who were above 60 years, had a longer duration of activity as a health promotion volunteer and were housewives showed significantly high scores on the first sub-scale, 'growth as individual health promotion volunteers' CONCLUSION: To measure the empowerment levels of health promotion volunteers, a 28-item scale was developed and its reliability and validity were confirmed. Health promotion volunteers as well as the public health nurses who assist them can use this scale to assess the empowerment levels of other health promotion volunteers.

Changes in Selected Food Groups Consumption and Quality of Meals in Japanese School Children during the COVID-19 Pandemic.

In 2020, a state of emergency was declared to control the devastating impact of coronavirus, leading to temporary school closures in Japan, meaning that school lunches were not provided to the majority of schoolchildren. Using questionnaires completed by participants' guardians, we examined the relationship between household income and the quality of meals in Japanese schoolchildren before, during, and after the state of emergency. Participants (1111 children, 10-14 years old) were chosen to form a nationally representative sample of the Japanese population. "Well-balanced dietary intake" was defined as the intake of (i) meat, fish, or eggs and (ii) vegetables. The desired prevalence was defined as equal to or more than twice a day. Household income was divided into quartiles. "Well-balanced dietary intake" was lower in all households during the state of emergency compared with before. The proportion of those with a "well-balanced dietary intake" at least twice a day was notably low in both Q3 and Q4 during the state of emergency compared with before the declared state of emergency; relative risk increase (95% CI) were Q1: -19.0% (-19.6% to -18.4%), p < 0.001, Q2: -21.3% (-22.1% to -20.6%) p < 0.001, Q3: -25.4% (-26.1% to -24.7%), p < 0.001, and Q4: -34.8% (-35.6% to -34.0%), p < 0.001. The interaction p (vs. Q1) of Q2, Q3, and Q4 were all <0.001. Guardians from low-income households had significantly higher rates of having less: time, psychological room, and financial position to prepare meals during the state of emergency. Our results suggest that schoolchildren's quality of meals worsened during the state of emergency, especially in low-income households, because school lunches were not provided.

Nutrient adequacy of Japanese schoolchildren on days with and without a school lunch by household income.

BACKGROUND: Evidence for whether the nutrient intakes of Japanese schoolchildren differ according to household income is sparse. OBJECTIVE: We investigated the role of school lunches for nutrient adequacy among Japanese primary school children using dietary reference intakes in a cross-sectional survey. DESIGN: Participants were 10- to 11-year-old (5th grade) children from 19 public primary schools in four prefectures of East Japan, and 836 children were analyzed. The participants completed 24-h dietary records with photographs of their meals for 4 consecutive days, composed of 2 days with and 2 days without a school lunch. -Children's household income was obtained from questionnaires that were completed by the participants' guardians and divided into the following three categories: low (0.2236-2.2361 million yen; n = 319), middle (2.3333-2.8868 million yen; n = 194), and high (3.1305-6.3640 million yen; n = 323). Logistic regression analyses were used to estimate the odds ratios for whether participants had poor nutrient intakes, with adjustment for confounders. RESULTS: On days without a school lunch, the prevalence of nutrient shortages was significantly higher compared with those on days with a school lunch for most macro- and micronutrients among all three levels of household income. Children from low-income households had higher rates of nutrient shortages for vitamin B6, pantothenic acid, K, Mg, P, Fe, and Zn than those from middle-income households on days without a school lunch (P = 0.004, 0.001, 0.001, 0.006, 0.037, <0.001, and 0.015, respectively), but those differences were not significant on days with a school lunch. CONCLUSION: The findings suggest that school lunches are important for achieving adequate nutrient intakes in schoolchildren and reduce disparities of adequate nutrient intake by household income levels.

Association between parents' work hours and nutrient inadequacy in Japanese schoolchildren on weekdays and weekends.

OBJECTIVES: Evidence is sparse concerning whether the nutrient intake in schoolchildren differs according to parents' work hours. The aim of this study was to investigate the relationship between parents' work hours and nutrient inadequacy among Japanese primary schoolchildren using dietary reference intakes on days with and without a school lunch. METHODS: Participants included 10- to 11-y-old children in grade 5 from 19 public primary schools in four prefectures of east Japan. Data for 699 children were analyzed. Participants completed 24-h dietary records with photographs of their meals for 4 d consecutively, which included of 2 d of weekdays and 2 d of weekends. Their mothers' and fathers' work hours were obtained from questionnaires that were completed by the participants' guardians. Logistic regression analyses were used to estimate the odds ratios for whether participants had poor nutrient intake, with adjustment for confounders. RESULTS: Children whose mothers worked ≥40 h/wk had significantly higher rates of nutrient shortages for vitamins A, E, K, and B6, pantothenic acid, potassium, magnesium, and iron (P = 0.007, 0.003, 0.007, 0.023, 0.021, 0.045, 0.004, and 0.009, respectively) than those in the 0 h/wk group. These differences were not significant based on fathers' working hours, with the exception of vitamin A (≥40 versus 0-39 h/wk, P = 0.032). Additionally, nutrient shortages for children were more pronounced on weekdays than on weekends. CONCLUSIONS: This evidence revealed the necessity to improve nutrition intake in children whose mothers work more than statutory working hours, which would enable children to have adequate nutrient intake, especially on weekdays.

Relationship between rice consumption and body weight gain in Japanese workers: white versus brown rice/multigrain rice.

Increasing obesity rates have driven research into dietary support for body weight control, but previous studies have only assessed changes in body weight of ±3 kg. We investigated the relationships between white or brown/multi-grain rice consumption and 1-year body weight gain ≥3 kg in Japanese factory workers (n = 437). Routine medical check-up data from a 1-year nutrition and lifestyle cohort study were analysed. Participants were divided into white rice and brown/multi-grain rice consumption groups and further classified by tertile of rice consumption. Multiple logistic regression analyses were performed by tertile. At 1 year, high white rice consumption was significantly associated with increased risk of body weight gain ≥3 kg compared with low white rice consumption, maintained after adjustment for age, sex, and consumption of other obesogenic foods (p = 0.034). In the brown/multi-grain rice consumption group, however, there was no significant difference in risk between high and low consumption, even after multi-variate adjustment (p = 0.387). The consumption of white rice, but not brown rice/multi-grain rice, was positively correlated with the risk of a 1-year body weight gain of 3 kg or more. This suggests that brown rice/multi-grain rice consumption is useful for body weight control among Japanese workers.

Characteristics of food group intake by household income in the National Health and Nutrition Survey, Japan.

This study examines the relationship between of food group intake and household income in a representative Japanese population. A total of 11,015 subjects (5,127 men and 5,888 women) aged 20 to 79 years, in 5,475 households who were part of the National Health and Nutrition Survey, Japan, in 2010 and 2011 were analyzed. Dietary intake was recorded for one day in November for those aged one year and older, from 300 randomly selected survey districts. Household income per year was recorded in the questionnaire in three categories: low (<2 million yen), middle (2-6 million yen) and high (>=6 million yen). Multilevel regression modelling was applied to take into account the hierarchical data structure of subjects nested within households, and households nested within survey districts. Dichotomous variables divided at the median intake of each food group were used. In a model where sex, age, household size and population size of municipalities to which survey districts belonged were adjusted, the total energy intake was found to be highest in individuals from middle income households, and lowest for those from low income households. In models where a total energy intake was additionally adjusted, household members with low and middle incomes had a significantly higher intake of cereals, and a lower intake of potatoes and starches, pulses, vegetables, fruits, mushrooms, fish and shellfish, milk and seasonings and spices compared with those with high incomes. In conclusion, household members with lower incomes in Japan consumed more staple foods, but less vegetable, fruit and fish.

Associations of self-efficacy, social support, and knowledge with fruit and vegetable consumption in Japanese workers.

BACKGROUND AND OBJECTIVES: Previous studies have suggested that self-efficacy, social support, and knowledge are primary psychosocial predictors of dietary behavior in adults. The present study aimed to investigate the associations of self-efficacy, social support, and knowledge with fruit and vegetable consumption in Japanese workers. METHODS AND STUDY DESIGN: From September to November 2014, a self-administered questionnaire was completed by Japanese workers at 8 workplaces in Niigata, Japan. Self-efficacy and social support for fruit and vegetable consumption were measured using a 3-item Likert scale across particular situations. Knowledge was measured using a single item about the recommended guidelines for fruit and vegetable consumption in Japan. Fruit and vegetable consumption was assessed using a validated, brief-type self-administered diet history questionnaire. RESULTS: Of the 457 respondents, 395 participants' data were analyzed. Scores in self-efficacy and social support showed a significant and positive association with fruit (p<0.001, p=0.002) and vegetable consumption (p=0.001, p=0.015). Knowledge was significantly and positively associated with vegetable consumption (p=0.015) but did not statistically differ in fruit consumption (p=0.645). CONCLUSIONS: The findings of this study suggest that selfefficacy and social support are positively associated with fruit and vegetable consumption in Japanese workers.