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Relationship between maternal employment status and children’s food intake in Japan

Environmental Health and Preventive Medicine volume 26, Article number: 106 (2021) Cite this article

Abstract

Background

Although long maternal working hours are reported to have a negative effect on children’s dietary habits, few studies have investigated this issue in Japan. Healthy dietary habits in childhood are important because they may reduce the risk of future disease. Here, we examined the relationship between maternal employment status and children’s dietary intake in 1693 pairs of Japanese primary school 5th and 6th graders and their mothers.

Methods

The survey was conducted using two questionnaires, a brief-type self-administered diet history questionnaire and a lifestyle questionnaire. The analysis also considered mothers’ and children’s nutrition knowledge, attitudes toward diet, and some aspects of family environment.

Results

Longer maternal working hours were associated with children’s higher intake of white rice (g/1000kcal) (β 11.4, 95%CI [1.0, 21.9]; working ≥8h vs. not working), lower intake of confectioneries (g/1000kcal) (β −4.0 [−7.6, −0.4]), and higher body mass index (BMI) (kg/m2) (β 0.62 [0.2, 1.0]). Although maternal employment status was not significantly associated with lower intake of healthy food (e.g., vegetables) or higher intake of unhealthy food (e.g., sweetened beverages) in the children, in contrast with previous studies, it may have affected children’s energy intake through their higher intake of white rice. Further, children’s nutrition knowledge and attitudes toward diet, mothers’ food intake, and some family environment factors were significantly associated with intakes of vegetables and sweetened beverages in the children.

Conclusions

Longer maternal working hours were significantly associated with higher intake of white rice and lower intake of confectioneries, as well as higher BMI among children. Even when a mother works, however, it may be possible to improve her child’s dietary intake by other means such as nutrition education for children or enhancement of food environment.

Background

In Japan, care for children at home is usually provided by the mother. Even when the wife works full time, the reported percentage of husbands in charge of meal preparation more than once or twice a week is only 32.5%. This rate decreases to 21.6% if the mother works part time, 15.9% if she is self-employed, and 18.1% if she is a housewife [1]. Three-generation cohabitation—which allows more sharing of cooking and housework between mothers and other family members—was previously relatively frequent in Japan, but the rate has declined over recent decades, to only 5.3% of all households surveyed in 2018 [2].

Many studies have reported that long working hours by mothers have negative effects on their children’s dietary habits, including a lower frequency of breakfast intake [3], increased intake of unhealthy foods (e.g., processed foods high in fat and sugar [4], decreased intake of vegetables and fruits [5], and poor diet quality [3, 4, 6, 7]. Most of these studies were conducted in Western countries; however, the importance of examining the relationship between maternal employment and the dietary intake of children is emphasized by findings that dietary habits in childhood affect those in adulthood [8] and that good eating habits in childhood may reduce the future risk of noncommunicable diseases [9, 10]. This topic is particularly important in Japan given that the employment rate of Japanese mothers with a youngest child aged 9–11 years rises every year [2]. Of particular interest, the better socioeconomic status provided by a mother’s income may allow an improvement in the quality of the family diet; but at the same time—if an undesirable relationship does exist—it is also necessary to identify factors that might improve the diet of affected children.

In this study, we investigated the relationship between maternal employment status and children’s food intake in Japanese primary school children in the 5th and 6th grade (i.e., age 10 to 12 years). We also considered mothers’ and children’s nutrition knowledge, attitude toward diet, and some family environment factors as possible confounders of the relationship to clarify mutual associations among these factors.

Methods

Participants

The survey was conducted in 14 public primary schools in a prefecture in the Kanto area, the central part of the main island of Japan, in May 2018. Seven cities and towns were chosen from five administrative districts in the prefecture, based on survey feasibility. Two public primary schools with similar characteristics (e.g., number of enrolled children, location (urban/rural)) were then selected from each city/town by the municipal boards of education. These 14 primary schools enrolled 2650 children as 5th and 6th graders in April 2018, all of whom were recruited into the study. At the same time, we also recruited the children’s guardians, most of whom were the main preparers of their meals. No exclusion criteria were set, because all children attending public schools in Japan are required to be educated equally.

Questionnaires and variables

Children and their guardians were surveyed using two questionnaires each. The first was a lifestyle questionnaire that asked about basic characteristics and nutrition knowledge, as well as attitudes and behaviors toward diet, and the second was a brief-type self-administered diet history questionnaire (BDHQ; BDHQ15y for children and BDHQ for adults) that assessed dietary intake.

The main exposure was whether or not the mother was working, and the number of working hours per day among those who were. The mothers were asked to answer the following question in the lifestyle questionnaire: “How many hours do you work a day? If you are not working, select ‘not currently working’”. Working was divided into three categories: (1) not working, (2) less than 8 h a day (<8), and (3) 8 or more hours a day (≥8). The cut-off point was based on the fact that the legal number of working hours in Japan is 8 h [11].

The outcome was children’s food intake, as estimated using the BDHQ15y, an instrument for primary, junior high, and high school students. It was developed from the BDHQ, which was designed to quantify food and nutrient intakes in Japanese adults over the preceding month through 80 questions that calculate the intake of 58 foods and over 100 nutrients. A dedicated calculation program is used to calculate food and nutrient intake. Food intake obtained from the BDHQ has been validated using food intake from semi-weighed dietary records [12]. In addition, nutrient intake obtained from the BDHQ has been validated [13]. The children responded to the BDHQ15y at home with their guardians. In the present analysis, food intake was energy-adjusted by the density method [14] and expressed as food intake per 1000 kcal of energy intake (g) [15].

The information below was collected using the lifestyle questionnaire. The children answered questions about sex, grade, nutrition knowledge, attitude toward diet, frequency of eating out for dinner, and the frequency of communication about diet with their guardians. The mothers answered questions about age, employment status and working hours, nutrition knowledge, attitude toward diet, sleeping hours, socioeconomic status, cohabitants (family structure), and the frequency of communication about diet with their child.

The nutrition knowledge questionnaire used to measure the nutrition knowledge of the children and their mothers has been validated [16]. This questionnaire includes the following sections: (1) knowledge about foods as nutrient sources, (2) physiological functions of nutrients in the body, (3) awareness of dietary recommendations (only for adults), and (4) relationship between nutrients and health outcomes. The percentage (%) of correct answers was calculated. Attitude toward diet was defined as follows. The children were asked “Do you pay attention to whether your diet is healthy or not?”, and given one answer choice (always, often, sometimes, or rarely). The children’s attitude toward diet was regarded as “adequate” for those who chose “always” or “often”, and “inadequate” for those who chose “sometimes” or “rarely.” The mothers were asked to respond to six statements: (1) I am careful to eat a balanced diet, (2) I am careful not to overeat, (3) I am careful to eat more fruits and vegetables, (4) I am careful to eat low-fat foods, (5) I am careful to avoid salty foods, and (6) I am careful to avoid foods with a high sugar content. They selected one response (totally agree, agree, not so much, or disagree) to each statement, which were scored as 3 for “totally agree,” 2 for “agree,” 1 for “not so much,” and 0 for “disagree.” These scores were then summed, giving a possible total range for attitude of 0 to 18. Two groups of equal size were then established by dividing mothers into 0–10 and 11–18 score groups, which were considered to represent “inadequate” and “adequate” attitudes, respectively. The mothers were also asked about their subjective socioeconomic status (SES), with answers selected from the five choices of “very straitened,” “straitened,” “average,” “affluent,” or “very affluent.” These were then further categorized as “straitened” for those who chose “very straitened” or “straitened,” “average,” and “affluent” for those who chose “affluent” or “very affluent.” The children were asked about the frequency of eating out for dinner, with responses from the four choices of “twice a week or more,” “between once a week and once a month,” “less than once a month,” or “almost never.” The children and mothers were both asked about the frequency of communication about diet, as follows: “Do you discuss meals, food, nutrition, etc. with your guardian?” (or “your child” in the statements for mothers), with responses from the four choices of “often,” “sometimes,” “not often,” or “rarely.” These were then further categorized as “high” for “often” and “sometimes,” and “low” for “not often” and “rarely.” The state of communication was then classified into four groups based on the combination of “high” and “low” answers by the children and their mothers (child (C):low-mother (M):low; C:low-M:high; C:high-M:low; C:high-M:high) and treated as a categorical variable.

Measurements

Body height and weight were measured to the nearest 0.1cm and 0.1 kg, respectively, with the child wearing light clothing and no shoes. Measurement was done as part of a routine health check-up by school nurses at each school from April to June in 2018. Body mass index (BMI) was calculated as body weight divided by the square of body height (kg/m2).

Statistical analysis

Among 2650 enrolled pairs of children and guardians, pairs that did not provide consent to participate or did not receive sufficient information through the questionnaire were excluded (Fig. 1). In addition, pairs in which the responding guardian was not the mother and those in which the energy intake of at least one of the pair, estimated using the BDHQ (BDHQ15y for child), was not between 600 and 4500 kcal were also excluded. Finally, 1693 mother and child pairs were included in the analysis (participation rate: 1693/2650*100 = 63.9%).

Fig. 1
figure 1

Flow diagram of participant selection for analysis

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Food intakes of the children and mothers were compared by mothers’ employment status (not working, working < 8 h, and working ≥ 8 h) using a univariate linear regression model which included the children’s or mothers’ food intake as a dependent variable and mothers’ employment status as an independent variable. Trends of association were examined by assigning scores to the level of the independent variable (not working = 0, working <8h = 1, working ≥8h = 2). Then, the association between the selected food intake among children and mothers’ employment status was examined using multivariate linear regression models which included the children’s food intake as a dependent variable and mothers’ employment status as an independent variable. For these analyses, intakes of five foods were selected as outcomes, namely white rice, soy products, and vegetables, based on the results of univariate linear regression analysis in the children; and confectioneries and sweetened beverages as indicators of unhealthy dietary habits [17, 18]. Intakes of potatoes and bread were not analyzed irrespective of the results of univariate analysis because the amount of intake was relatively small and the influence of these two items on health is unclear. Further, based on the results for the relationship between food intakes and maternal employment status, the association between children’s BMI and maternal employment status was assessed.

The lifestyle factors listed below were considered possible confounders of the relationship between children’s food intake and mothers’ employment status. The multivariate models were adjusted using covariates for the child (sex, grade, nutrition knowledge, and attitude toward diet), mother (nutrition knowledge, attitude toward diet, food intake corresponding to the child [i.e., if children’s vegetable intake was a dependent variable in the model, mothers’ vegetable intake was used as a covariate], and sleeping hours on weekdays as an index of spare time), and family environment (cohabitants, socioeconomic status, frequency of eating out [as a counter index of home cooking], and frequency of communication between the child and mother). For white rice and confectioneries, trends of association were examined in the same manner as in univariate analysis. All analyses were performed with Stata/SE 15.1 for Windows (StataCorp LLC, Texas, USA). Statistical tests were two-sided, and p values of <0.05 were considered statistically significant.

Results

The children and their mothers are characterized in Table 1. Among the mothers, 314 (18.5%) did not work, 798 (47.1%) worked < 8 h per day, and 581 (34.3%) worked ≥ 8 h per day.

Table 1 Characteristics of subjects (1693 pairs)
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Food intakes of the children and mothers are summarized by maternal employment status in Table 2.

Table 2 Children’s and mothers’ food intake and BMI by maternal employment status (n=1693)
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Longer working hours were associated with higher intake of white rice in children, and lower intakes of bread, potatoes, soybean products, and vegetables. For the mothers, longer working hours were significantly associated with their own lower intakes of soybean products, vegetables, fruits, and fish and shellfish, as well as higher intake of bread.

The results of multivariate linear regression analysis are shown in Table 3.

Table 3 Association of lifestyle factors with children’s food intake (n=1693)
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After adjustment for possible confounding factors, maternal employment status was significantly associated with higher intake of white rice (g/1000kcal) (β 11.4, 95% confidence interval (CI) [1.0, 21.9]; working ≥8h vs. not working) and lower intake of confectioneries (g/1000kcal) (β −4.0, 95%CI [−7.6, −0.4]; working ≥8h vs. not working) in the children. Trend of association was also significant between white rice/confectionery intake and three categories of maternal employment status (white rice, β 6.3, 95%CI [1.2, 11.4]; confectioneries, β −1.9, 95%CI [−3.7, −0.2]). In other words, factors other than maternal employment were significantly and consistently associated with food intakes in the children. The girls consumed more soybean products, vegetables, and confectioneries than the boys, but less white rice. Higher nutrition knowledge of the children was significantly associated with higher intakes of soybean products and vegetables and lower intakes of confectioneries and sweetened beverages. Adequate (better) attitude toward diet among the children was also associated with higher intake of vegetables and lower intake of sweetened beverage. Among mothers’ factors, corresponding food intakes among the mothers were consistently associated with their children’s food intake. Regarding family environment, cohabitation with the child’s father (the mother’s husband) was significantly associated with higher intake of vegetables and lower intake of sweetened beverage. Further, frequent eating out for dinner was associated with lower intake of vegetables and higher intake of confectioneries. Frequent communication about diet was associated with lower intake of sweetened beverage.

Since white rice is the main source of carbohydrate among Japanese, we also assessed the relationship between BMI in the children and maternal employment status (Table 4).

Table 4 Association of lifestyle factors with children’s BMI (n=1693)
Full size table

Even after adjusting for covariates in the multivariate model, longer working hours in mothers was associated with higher BMI in children (kg/m2) (β 0.62, 95%CI [0.2, 1.0]; working ≥8h vs. not working). A higher BMI of mothers was also associated with a higher BMI of the children.

Discussion

To our knowledge, this is the first study to investigate the relationship between children’s food intake and maternal employment status in Japan. When mothers had jobs and their working hours were longer, the white rice intake of their children was higher and the intake of confectioneries was lower. In addition, longer maternal working hours was significantly associated with higher BMI in the children. In contrast to previous studies, we found that maternal employment status was not associated with unhealthy food choices, including no decrease in vegetable intake [3, 4, 6] and no increase in sweetened beverage intake [4]. Nevertheless, children’s energy intake was likely affected through the increase in white rice intake.

White rice (refined rice) is a major staple food for Japanese, and it is easily speculated that the preparation of white rice is simple and time-saving for busy mothers due to the wide use of electric rice cookers in Japan (household penetration, 89%) [19]. Although obesity rates among primary school students in Japan are not particularly high (10.0% in boys and 8.8% in girls aged 11 years in 2018) [20], the intake of white rice among children with working mothers warrants attention. The same association between higher BMI and maternal employment has been reported previously [4, 21,22,23,24]. Also, a higher intake of white rice has been associated with risk of type 2 diabetes in adults [25]. The health effect of white rice intake in childhood warrants further investigation.

In contrast, our present study found that the intakes of other foods such as vegetables/soybean products (usually included in side dishes) or fish/meats (usually included in main dishes) in children did not differ by maternal employment status. These results differ from previous studies which reported that longer maternal working hours had negative effects on children’s dietary habits [3, 5]. In particular, although the intake of confectioneries is usually considered a marker of broader unhealthy dietary habits [26], we found that intake was lower in children whose mothers worked for longer hours. Since nearly 90% of the BDHQ15y was completed by the children themselves or the children and the guardian together, irrespective of maternal employment status, the possibility of underreporting of snack intake by the working mothers was unlikely.

The difference between these present and past results might be due to the covariates included in the respective models. Several past studies adopted race, mother’s educational background, mother’s childbirth age, socioeconomic-status, and household income as covariates [3,4,5]. In contrast, our present models included nutrition knowledge, attitude toward diet, mothers’ food intake, family structure, and communication between child and mother, which were not assessed in these previous studies. Although these factors might be associated with maternal and family background factors, such as education, household income or occupation, some were more closely associated with food intake in the children than maternal employment status. The association between higher nutrition knowledge and higher intake of vegetables among children was consistent with previous studies [16, 27]. For soybean products, a similar relationship has been reported for girls [16]. A better understanding of nutrition and foods and the acquisition of suitable attitudes towards diet are thought to be important to the achievement of good dietary habits in children.

Regarding maternal covariates, correspondence between the mothers’ food intake and that of their children was the only factor which was significantly associated with the children’s food intake. Previous studies reported that the amount of food mothers served themselves was associated with the amount they served their children [28] and that higher vegetable intake of mothers was associated with higher vegetable intake among their children [29]. We observed a similar association between the food intake of mothers and children. This finding is considered well plausible, given that the mothers both answered the questionnaires and were the main preparers of meals for the children and—apart from school lunches—consumed most of the meals with their children. In contrast, the mothers’ nutrition knowledge and attitude toward diet were not associated with the intake of any food in the children. Behavior—that is, the actual selection of dishes and foods by the mothers—was thought to be more important to improving dietary habits among the children than the mother’s nutrition knowledge and attitude toward diet. Similar results were seen in another study from Japan, which reported that nutrient intake among junior high school students did not differ no matter whether the mother had high or low nutrition knowledge [30]. In contrast, other studies reported different results [31, 32], indicating the need for further investigation of the influence of mothers’ nutrition knowledge and attitude toward diet on children’s dietary intake. The effect may differ by children’s age.

Among family environment factors, cohabitation with the child’s father and frequency of eating out for dinner were significantly associated with the intakes of two foods. Average annual income of single-parent families, particularly mother-child families (3.48 million Japanese yen in 2015 [33]), was lower than that of all families which included children (7.08 million Japanese yen in 2015 [2]). Cohabitation with the child’s father might have been an index of the financial condition of the family. Moreover, cohabitation and the frequency of eating out may be indexes of the mother’s spare time. A survey by The Japan Institute for Labour Policy and Training in 2014 [34] reported that the proportion of mothers who thought that working time was too long to allow sufficient time for housework and child care was higher in mother-child families than in two-parent families (58.4% vs. 48.2%). Establishment of a better food environment appears to be an important means of supporting busy families, particularly those with time and income limitations. For example, facilitated or subsidized access to time-saving processed foods, such as cut vegetables, frozen vegetables, and semi-prepared foods would likely facilitate children and their guardians in consuming healthier meals. Communication about diet between children and mothers was another factor associated with sweetened beverage intake. Frequent communication, particularly as recognized by the mothers, was associated with a decrease in this intake. More communication between mothers and their children about diet is a potential means of promoting better dietary habits among children.

Our study has several strengths. First, the survey participants were recruited from all five administrative districts in the prefecture, which was considered to be highly representative of the region. The participation rate was relatively high (1693/2650 * 100 = 63.9%). Second, the children and their mothers were surveyed simultaneously, and their data were combined to assess their relationship. Third, food intakes were quantitatively assessed by the BDHQ and the BDHQ15y, both of which have been validated [12, 13]. Fourth, the statistical model made sufficient adjustment for confounding factors. For example, nutrition knowledge, attitude toward diet, and communication between children and mothers were newly assessed with maternal employment status.

Several limitations of the study should be mentioned. First, given that the study was conducted in a single prefecture in Japan, the generalizability of the results should be carefully considered. Nevertheless, the prefecture is located in the central part of the main island of Japan, includes both urban and rural areas, and is middle ranked among Japan’s 47 prefectures with regard to area, population, and population density. In addition, maternal employment in this prefecture was similar to that in a national survey [35]. The age range of the participating children was limited to 10 to 12 years, and this inclusion criterion also hampered the generalizability of the study. Although it is difficult to collect information from children younger than those in the present study, conducting a similar study in toddlers or preschool children should be useful. Second, maternal employment was evaluated in terms of working hours per day only, and other factors such as night shifts, self-employment, number of working days per week, and commuting time were not considered. These other aspects of working style should be considered in future studies. Third, children’s attitudes toward diet were ascertained using a single item only, which has not been validated. Nevertheless, given that children’s attitudes toward diet were significantly associated with food intake, the question used in the present study (“Do you pay attention to whether your diet is healthy or not?”) likely captured certain aspects of attitude toward diet.

Conclusion

This study showed that longer maternal working hours were significantly associated with higher intake of white rice and lower intake of confectioneries, as well as higher BMI among children. In contrast, other factors such as children’s nutrition knowledge, children’s attitudes toward diet, mothers’ food intake, and family environment factors affected the intake of the majority of foods among the children, including that of vegetables and sweetened beverages. Even when a mother works, it may be possible to improve her children’s dietary intake by other means, such as nutrition education for children or enhancement of the food environment.

Availability of data and materials

The datasets used and/or analyzed during the current study are available for research purpose from the corresponding author on reasonable request.

References

  1. Yamamoto J, Oura Y, Tamaki S, Yagi K. Effects of employment status of women and presence of children on dependency on processed foods (in Japanese). Japan J Farm Manag. 2017;55:71–6. https://doi.org/10.11300/fmsj.55.3_71.

    Article  Google Scholar 

  2. Ministry of Health Labour and Welfare: Comprehensive Survey of Living Conditions. 2018. https://www.mhlw.go.jp/toukei/saikin/hw/k-tyosa/k-tyosa18/index.html. Accessed Mar.

  3. Wu JC. Parental work characteristics and diet quality among pre-school children in dual-parent households: results from a population-based cohort in Taiwan. Public Health Nutr. 2018;21:1147–55. https://doi.org/10.1017/S1368980017003548.

    Article  PubMed  Google Scholar 

  4. Datar A, Nicosia N, Shier V. Maternal work and children’s diet, activity, and obesity. Soc Sci Med. 2014;107:196–204. https://doi.org/10.1016/j.socscimed.2013.12.022.

    Article  PubMed  PubMed Central  Google Scholar 

  5. Hawkins SS, Cole TJ. Law C, Millennium Cohort Study Child Health G. Examining the relationship between maternal employment and health behaviours in 5-year-old British children. J Epidemiol Community Health. 2009;63:999–1004. https://doi.org/10.1136/jech.2008.084590.

    Article  PubMed  Google Scholar 

  6. Bauer KW, Hearst MO, Escoto K, Berge JM, Neumark-Sztainer D. Parental employment and work-family stress: associations with family food environments. Soc Sci Med. 2012;75:496–504. https://doi.org/10.1016/j.socscimed.2012.03.026.

    Article  PubMed  PubMed Central  Google Scholar 

  7. Li J, O'Sullivan T, Johnson S, Stanley F, Oddy W. Maternal work hours in early to middle childhood link to later adolescent diet quality. Public Health Nutr. 2012;15:1861–70. https://doi.org/10.1017/S1368980011003053.

    Article  PubMed  Google Scholar 

  8. Wadhera D, Capaldi Phillips ED, Wilkie LM, Boggess MM. Perceived recollection of frequent exposure to foods in childhood is associated with adulthood liking. Appetite. 2015;89:22–32. https://doi.org/10.1016/j.appet.2015.01.011.

    Article  PubMed  Google Scholar 

  9. Aatola H, Koivistoinen T, Hutri-Kahonen N, Juonala M, Mikkila V, Lehtimaki T, et al. Lifetime fruit and vegetable consumption and arterial pulse wave velocity in adulthood: the Cardiovascular Risk in Young Finns Study. Circulation. 2010;122:2521–8. https://doi.org/10.1161/CIRCULATIONAHA.110.969279.

    Article  PubMed  Google Scholar 

  10. Kaikkonen JE, Mikkila V, Raitakari OT. Role of childhood food patterns on adult cardiovascular disease risk. Curr Atheroscler Rep. 2014;16:443. https://doi.org/10.1007/s11883-014-0443-z.

    Article  PubMed  Google Scholar 

  11. Ministry of Health Labour and Welfare: Article 32 of the Labor Standards Act. https://www.mhlw.go.jp/web/t_doc?dataId=73022000&dataType=0&pageNo=1. Accessed March.

  12. Kobayashi S, Murakami K, Sasaki S, Okubo H, Hirota N, Notsu A, et al. Comparison of relative validity of food group intakes estimated by comprehensive and brief-type self-administered diet history questionnaires against 16 d dietary records in Japanese adults. Public Health Nutr. 2011;14:1200–11. https://doi.org/10.1017/S1368980011000504.

    Article  PubMed  Google Scholar 

  13. Kobayashi S, Honda S, Murakami K, Sasaki S, Okubo H, Hirota N, et al. Both comprehensive and brief self-administered diet history questionnaires satisfactorily rank nutrient intakes in Japanese adults. J Epidemiol. 2012;22:151–9. https://doi.org/10.2188/jea.je20110075.

    Article  PubMed  PubMed Central  Google Scholar 

  14. Walter W. Nutritional Epidemiology; 2013.

    Google Scholar 

  15. Murakami K, Sasaki S, Uenishi K. The degree of misreporting of the energy-adjusted intake of protein, potassium, and sodium does not differ among under-, acceptable, and over-reporters of energy intake. Nutr Res. 2012;32:741–50. https://doi.org/10.1016/j.nutres.2012.09.001.

    CAS  Article  PubMed  Google Scholar 

  16. Asakura K, Todoriki H, Sasaki S. Relationship between nutrition knowledge and dietary intake among primary school children in Japan: combined effect of children’s and their guardians’ knowledge. J Epidemiol. 2017;27:483–91. https://doi.org/10.1016/j.je.2016.09.014.

    Article  PubMed  PubMed Central  Google Scholar 

  17. Ludwig DS, Peterson KE, Gortmaker SL. Relation between consumption of sugar-sweetened drinks and childhood obesity: a prospective, observational analysis. Lancet. 2001;357:505–8. https://doi.org/10.1016/S0140-6736(00)04041-1.

    CAS  Article  PubMed  Google Scholar 

  18. Nissinen K, Mikkilä V, Männistö S, Lahti-Koski M, Räsänen L, Viikari J, et al. Sweets and sugar-sweetened soft drink intake in childhood in relation to adult BMI and overweight. The Cardiovascular Risk in Young Finns Study. Public Health Nutr. 2009;12:2018–26. https://doi.org/10.1017/S1368980009005849.

    Article  PubMed  Google Scholar 

  19. Ministry of Internal Affairs and Communications: National Survey of Consumption. https://www.stat.go.jp/data/zensho/2014/kekka.html (2014). Accessed March.

  20. Ministry of Education Culture Sports Science and Technology: School Health Examination Survey. https://www.mext.go.jp/b_menu/toukei/chousa05/hoken/kekka/k_detail/1411711.htm (2018). Accessed March.

  21. Gaina A, Sekine M, Chandola T, Marmot M, Kagamimori S. Mother employment status and nutritional patterns in Japanese junior high schoolchildren. Int J Obes (Lond). 2009;33:753–7. https://doi.org/10.1038/ijo.2009.103.

    CAS  Article  Google Scholar 

  22. Watanabe E, Lee JS, Kawakubo K. Associations of maternal employment and three-generation families with pre-school children’s overweight and obesity in Japan. Int J Obes (Lond). 2011;35:945–52. https://doi.org/10.1038/ijo.2011.82.

    CAS  Article  Google Scholar 

  23. Ziol-Guest KM. A commentary on “maternal work and children’s diet, activity, and obesity”. Soc Sci Med. 2014;107:205–8. https://doi.org/10.1016/j.socscimed.2014.02.038.

    Article  PubMed  Google Scholar 

  24. Koca T, Akcam M, Serdaroglu F, Dereci S. Breakfast habits, dairy product consumption, physical activity, and their associations with body mass index in children aged 6-18. Eur J Pediatr. 2017;176:1251–7. https://doi.org/10.1007/s00431-017-2976-y.

    CAS  Article  PubMed  Google Scholar 

  25. van Dam RM. A global perspective on white rice consumption and risk of type 2 diabetes. Diabetes Care. 2020;43:2625–7. https://doi.org/10.2337/dci20-0042.

    Article  PubMed  Google Scholar 

  26. Vik FN, Heslien KEP, Van Lippevelde W, Øverby NC. Effect of a free healthy school meal on fruit, vegetables and unhealthy snacks intake in Norwegian 10- to 12-year-old children. BMC Public Health. 2020;20:1369. https://doi.org/10.1186/s12889-020-09470-2.

    Article  PubMed  PubMed Central  Google Scholar 

  27. Wardle J, Parmenter K, Waller J. Nutrition knowledge and food intake. Appetite. 2000;34:269–75. https://doi.org/10.1006/appe.1999.0311.

    CAS  Article  PubMed  Google Scholar 

  28. Johnson SL, Hughes SO, Cui X, Li X, Allison DB, Liu Y, et al. Portion sizes for children are predicted by parental characteristics and the amounts parents serve themselves. Am J Clin Nutr. 2014;99:763–70. https://doi.org/10.3945/ajcn.113.078311.

    CAS  Article  PubMed  PubMed Central  Google Scholar 

  29. Tada Y, Tomata Y, Sunami A, Yokoyama Y, Hida A, Furusho T, et al. Examining the relationship between vegetable intake of mothers and that of their children: a cross-sectional study of 10- to 12-year-old schoolchildren in Japan. Public Health Nutr. 2015;18:3166–71. https://doi.org/10.1017/S1368980015002591.

    Article  PubMed  Google Scholar 

  30. Matsumoto M, Hatamoto Y, Masumoto A, Sakamoto A, Ikemoto S. Mothers’ nutrition knowledge is unlikely to be related to adolescents’ habitual nutrient intake inadequacy in Japan: a cross-sectional study of Japanese junior high school students. Nutrients. 2020;12. https://doi.org/10.3390/nu12092801.

  31. Yung TKC, Lee A, Ho MM, Keung VMW, Lee JCK. Maternal influences on fruit and vegetable consumption of schoolchildren: case study in Hong Kong. Matern Child Nutr. 2010;6:190–8. https://doi.org/10.1111/j.1740-8709.2009.00198.x.

    Article  PubMed  Google Scholar 

  32. Al-Shookri A, Al-Shukaily L, Hassan F, Al-Sheraji S, Al-Tobi S. Effect of mothers nutritional knowledge and attitudes on omani children’s dietary intake. Oman Med J. 2011;26:253–7. https://doi.org/10.5001/omj.2011.61.

    Article  PubMed  PubMed Central  Google Scholar 

  33. Ministry of Health Labour and Welfare: Nationwide Survey on Single parent household. https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/0000188147.html (2016). Accessed March.

  34. The Japan Institute for Labour Policy and Training: Survey on Living Conditions of Households with Children and Employment of Their Parents 2014 (3rd National Survey of Households with Children). http://www.jil.go.jp/institute/research/2015/145.html (2014). Accessed March.

  35. Ministry of Health Labour and Welfare: National Health and Nutrition Survey. . https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/kenkou/eiyou/h29-houkoku.html (2017). Accessed March.

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Acknowledgements

The authors thank the teachers who supported the research in the participating schools and the staff of the municipal government for their valuable contribution.

Funding

This study was financially supported by the JSPS KAKENHI Grant Number 17H01973 from the Japan Society for the Promotion of Science. The funding organization played no role in the study design, data collection, analysis, decision to publish, or preparation of the manuscript.

Author information

Authors and Affiliations

  1. Department of Environmental and Occupational Health, Toho University Graduate School of Medicine, Tokyo, Japan

    Sachie Mori

  2. Department of Environmental and Occupational Health, School of Medicine, Toho University, Omori-Nishi 5-21-16, Ota-ku, Tokyo, 143-8540, Japan

    Keiko Asakura & Yuji Nishiwaki

  3. Department of Social and Preventive Epidemiology, School of Public Health, The University of Tokyo, Tokyo, Japan

    Satoshi Sasaki

Authors
  1. Sachie Mori
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  2. Keiko Asakura
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  3. Satoshi Sasaki
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  4. Yuji Nishiwaki
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Contributions

The authors’ contributions were as follows: KA designed the research. SM and KA performed the survey and collected the data. SM analyzed the data and wrote the draft. SS and YN supervised all of the procedures and interpreted the results. The authors read and approved the final manuscript.

Corresponding author

Correspondence to Keiko Asakura.

Ethics declarations

Ethics approval and consent to participate

All procedures involving study participants were approved by the Ethics Committee of the Faculty of Medicine, Toho University (approval of revised version: no. A19003_A17043 on Apr. 17, 2019; first approval: no. A17043 on Sep, 6, 2017). Written informed consent for the children was obtained from their guardians. Regarding the guardians themselves, completion and return of the questionnaires were not mandatory, and those who did so were deemed to have consented to participation.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Mori, S., Asakura, K., Sasaki, S. et al. Relationship between maternal employment status and children’s food intake in Japan. Environ Health Prev Med 26, 106 (2021). https://doi.org/10.1186/s12199-021-01026-z

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  • DOI: https://doi.org/10.1186/s12199-021-01026-z

Keywords

  • Maternal employment
  • Food intake
  • Primary school children
  • Nutrition knowledge
  • Dietary attitude
  • Family environment

Environmental Health and Preventive Medicine

ISSN: 1347-4715

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