Weight-Loss Behaviors of Avoiding Between Meal and Midnight Snack in Teenagers Associated with Gestational Diabetes: The Japan Environment and ...
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Weight-Loss Behaviors of Avoiding Between Meal and Midnight Snack in Teenagers Associated with Gestational Diabetes: The Japan Environment and Children’s Study Marina Minami Kochi University Takafumi Watanabe Kochi University Masamitsu Eitoku ( meitoku@kochi-u.ac.jp ) Kochi University Nagamasa Maeda Kochi University Mikiya Fujieda Kochi University Narufumi Suganuma Kochi University Research Article Keywords: Gestational diabetes, snack, teenage years, Japan Environment and Children’s study Posted Date: October 26th, 2021 DOI: https://doi.org/10.21203/rs.3.rs-962177/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Page 1/16
Abstract Background: Dietary habits and weight control before pregnancy are important in preventing gestational diabetes. This study aims to examine whether the weight-loss behavior of avoiding between meal and midnight snacks in teenagers is associated with subsequent gestational diabetes mellitus (GDM). Methods: A total of 89,227 (85.7% of the total) mother-infant pairs of live births were included in our study of the Japan Environment and Children's Study (JECS). In the second or third trimesters, participants were asked to report their weight-loss behaviors during their teenage years. Response items included avoidance of meals and midnight snacking. The main outcome of our study was the prevalence of GDM. Results: Overall, 2,066 (2.3%) participants had GDM. Relative to those without GDM, women with GDM were older, were smokers, had a higher prevalence of hypertension, previous cesarean delivery, mental illness, and higher body mass index (BMI). Weight-loss behavior in their teenage years was associated with a decreased risk of GDM (unadjusted crude odds ratio, 0.83; 95% confidence interval [CI]: 0.76–0.91), model 1 (adjusted odds ratio [aOR], 0.86; 95% CI: 0.79–0.94), and model 2 (aOR, 0.80; 95% CI: 0.73–0.88). Weight-loss behavior in teens was associated with a decreased risk of GDM in the normal weight [aOR, 0.79; 95% CI: 0.70–0.89) and overweight (aOR, 0.82; 95% CI: 0.69–0.98) groups. Conclusions: The results suggest that weight-loss behaviors of avoiding in-between meals and midnight snacking as teenagers are associated with a decreased risk of developing GDM. Background Gestational diabetes mellitus (GDM) is caused by an abnormality in glucose metabolism (1) resulting in the inability to control blood glucose levels during pregnancy (2). Blood glucose levels should be measured at any time during the first and second trimester of pregnancy, and if the blood glucose levels are high, a glucose tolerance test should be performed to make the diagnosis of GDM (3). The treatment of GDM is based on using dietary therapy to control blood sugar levels. To avoid a sudden increase in blood glucose levels due to the intake of too many calories at one time, it is recommended that patients diagnosed with GDM eat six small meals a day (three main meals and three in-between) (4). It is difficult to change pre-pregnancy eating habits, and the establishment of healthy eating habits before pregnancy is important for the prevention of GDM (5). Previous studies have shown that the eating habits of teenagers influence their eating habits in adulthood. Eating habits are established through daily dietary habits (6). Poor eating habits include skipping breakfast, fast eating, picky eating, midnight snacking, and excessive snacking. Family eating habits influence the establishment of healthy eating habits in children (7, 8). Therefore, to establish healthy eating habits, various efforts are being made targeting children at a young age in Japan (9). Page 2/16
Between meal and midnight snacks are a way of compensating for a low-calorie intake which can cause fatigue. However, these snacks can lead to obesity and overweight, depending on the way that they are consumed (10). Consumption can be managed by setting a time, eating moderate amounts, and avoiding high fat, high-calorie foods (11). Excessive weight-loss behavior has been linked to psychological dysregulation. Gowey (12) has suggested that psychological dysregulation is associated with a greater body mass index (BMI), problematic eating patterns and behaviors, and body dissatisfaction, especially in adolescents and young adults. To the best of our knowledge, no studies have investigated the association between teenage weight-loss behavior and GDM. Dietary habits (13) and weight control before pregnancy (14) are important in preventing GDM. Thus, this study aims to examine whether an association exists between eating habits in teenagers and subsequent GDM. Methods Study design and setting This study used a dataset (jecs-an-20180131) from a nationwide, prospective birth cohort study, the Japan Environment and Children's Study (JECS). The detailed protocol and baseline information of participants have been previously reported (15, 16). As a brief description, approximately 100,000 pregnant women living in Study Areas were recruited during early pregnancy at Co-operating health care providers or at local government offices between January 2011 and March 2014. The JECS protocol was reviewed and approved by the Ministry of the Environment’s Institutional Review Board on Epidemiological Studies and the Ethics Committees of all participating institutions. Participants will be followed up until the participating children reach 13 years of age. Eligibility was considered if a pregnant woman was (1) residing in a Study Area at the time of recruitment and was expected to reside continually in Japan; (2) expected to give birth between August 1, 2011, and mid-2014; and (3) capable of understanding the Japanese language and completing the self-administered questionnaires. The JECS collected demographic data and clinical and obstetric information through self-administered questionnaires or medical record transcripts. The questionnaires were distributed during the first trimester and second or third trimesters. Written informed consent was obtained from all study participants. Study population The dataset comprised 104,065 fetal records. In our analyses, we excluded participants with a history of stillbirth or missing birth status (n = 3,921), multiple gestations (n = 1,889); multiple pregnancies (n = 5,465), under 20 years old (n = 1,132), who did not report weight-loss behavior during their teenage years (n=1,643), with biologically implausible weight values measured before delivery (n = 4), and with a history of type 1, type 2, or gestational diabetes mellitus (n = 784). Subsequently, 89,227 (85.7%) mother-infant pairs of live births were included in our study (Figure 1). Page 3/16
Pregnant women’s weight-loss behavior during teens In the second or third trimester, participants were asked to report their dietary behaviors during their teenage years. Response items included avoiding between-meal and midnight snacks. Outcome measurements The main outcome of our study was GDM. GDM cases were identified using medical record transcripts, which were completed after delivery by physicians, Research Co-ordinators, midwives, nurses, or doctors. Other variables The JECS questionnaire and the records of Co-operating health care providers were used as possible adjustment factors. Maternal characteristics including maternal age, educational level, total energy intake (kcal/d), daily physical activity, smoking habit, alcohol consumption, marital status, and past medical history were obtained through the first and second waves of the questionnaires. Information on maternal age, height and weight, parity, and previous cesarean delivery were retrieved from medical records. Daily energy intake during pregnancy (kcal/d) was calculated based on the information collected through self-reported food frequency questionnaires (FFQ) (17) and used to form three groups (tertiles) with an approximately equal number of participants. Daily physical activity during pregnancy was obtained using the shortened Japanese version of the International Physical Activity Questionnaires, which considers all types of activities, including work- related and leisure-time activities and household chores (18, 19). We calculated metabolic equivalent minutes per day (MET-mins/day) and categorized it into three physical activity levels (tertiles). Maternal age was divided into two groups: 20–34 years and ≥35 years. Pre-pregnancy BMI was calculated as self-reported pre-pregnancy weight in kilograms divided by height in meters squared and stratified into underweight (
GDM group differences concerning maternal characteristics were examined using the chi-squared test for categorical variables. We then constructed crude and adjusted logistic regression models to assess the associations of behavior with weight-loss behaviors of avoiding between meal and midnight snack in teens. In the adjusted model 1, we included the following maternal characteristics considered to be the determinants of group membership: maternal age, educational level, total energy intake, physical activity, smoking, alcohol consumption, marital status, parity, past medical history, history of hypertension, pregnancy hypertension mental illness, and previous cesarean delivery. In the adjusted model 2, we included model 1 plus BMI, with a 95% confidence interval (CI). We then performed subgroup analyses of adjusted logistic regression analysis by BMI category. A two-tailed p-value
Table 1 Characteristics of women with GDM (N = 89,227) All GDM no-GDM 89,227 2,066 (2.3) 87,161 (97.7) n (%) Maternal age, years 20–34 67,433 (75.6) 1,221 (59.1) 66,212 (76.0) ≥35 21,778 (24.4) 845 (40.9) 20,933 (24.0) Missing 16 (0.0) (0.0) 16 (0.0) Educational level High school or less 31,433 (35.2) 744 (36.0) 30,689 (35.2) Vocational school/College 37,759 (42.3) 883 (42.7) 36,876 (42.3) University or higher 19,531 (21.9) 425 (20.6) 19,106 (21.9) Missing 504 (0.6) 14 (0.7) 490 (0.6) Total energy intake, kcal/d 1st (lowest tertile) 29,671 (33.3) 667 (32.3) 29,004 (33.3) 2nd 29,596 (33.2) 670 (32.4) 28,926 (33.2) 3rd 29,502 (33.1) 716 (34.7) 28,786 (33.0) Missing 458 (0.5) 13 (0.6) 445 (0.5) Physical activity, MET-mins/d 1st (lowest tertile) 30,727 (34.4) 714 (34.6) 30,013 (34.4) 2nd 27,466 (30.8) 659 (31.9) 26,807 (30.8) 3rd 28,914 (32.4) 646 (31.3) 28,268 (32.4) Missing 2,120 (2.4) 47 (2.3) 2,073 (2.4) Smoking Never smoked 51,560 (57.8) 1,132 (54.8) 50,428 (57.9) Quit smoking 32,454 (36.4) 790 (38.2) 31,664 (36.3) BMI, body mass index; P-values are the results of Chi square test Page 6/16
All GDM no-GDM Currently smoking 4,128 (4.6) 118 (5.7) 4,010 (4.6) Missing 1,085 (1.2) 26 (1.3) 1,059 (1.2) Alcohol Never drank 30,264 (33.9) 757 (36.6) 29,507 (33.9) Quit drinking 49,132 (55.1) 1,088 (52.7) 48,044 (55.1) Currently drinking 8,992 (10.1) 195 (9.4) 8,797 (10.1) Missing 839 (0.9) 26 (1.3) 813 (0.9) Single mother 3,597 (4.0) 85 (4.1) 3,512 (4.0) Parity 0 36,715 (41.2) 867 (42.0) 35,848 (41.1) 1 32,779 (36.7) 749 (36.3) 32,030 (36.8) 2 or more 17,545 (19.7) 407 (19.7) 17,138 (19.7) Missing 2,188 (2.5) 43 (2.1) 2,145 (2.5) Past medical history Pre-pregnancy hypertension (yes) 2,059 (2.3) 91 (4.4) 1,968 (2.3) Pregnancy hypertension (yes) 844 (1.0) 46 (2.2) 798 (0.9) Mother's mental illness (yes) 7,086 (7.9) 186 (9.0) 6,900 (7.9) Previous cesarean delivery (yes) 6,978 (7.8) 262 (12.7) 6,716 (7.7) BMI categories, kg/m2
Association between avoiding between meal and midnight snack and gestational diabetes The results of the logistic regression analysis are presented in Table 2. Weight-loss behavior in teens was associated with a decreased risk of GDM [unadjusted crude odds ratio 0.83 (95% CI 0.76–0.91), model 1 adjusted odds ratio (aOR) 0.86 (95% CI 0.79–0.94), and model 2 aOR 0.80 (95% CI 0.73–0.88)]. Table 2 Weight-loss behaviors of avoiding between meal and midnight snack in teens linked to GDM (N = 89,227) Model 1 Model 2 crude OR 95% aOR 95% CI aOR 95% CI CI Avoiding between meal and midnight 0.83 (0.76-0.91) 0.86 (0.79- 0.80 (0.73-0.88) snack 0.94) Note: Bold font indicates significant result. Model 1: Adjusted for maternal age, educational level, total energy intake, physical activity, smoking during pregnancy, alcohol consumption, marital status, parity, pre-pregnancy hypertension, pregnancy hypertension, mental illness, and previous cesarean delivery. Model 2: Adjusted for model 1 plus BMI; CI, confidence interval; OR, odds ratio Association between avoiding between meal and midnight snack and gestational diabetes by BMI category The results of the crude and adjusted logistic regression analyzing the association between weight-loss behavior and GDM by BMI category are presented in Table 3. Weight-loss behavior in teens was associated with a decreased risk of GDM in the normal weight [aOR 0.79 (95% CI 0.70–0.89)] and overweight [aOR 0.82 (95% CI 0.69–0.98)] groups. No association was found in the underweight group [aOR 0.87 (95% CI 0.65–1.18)]. Table 3 Weight-loss behaviors of avoiding between meal and midnight snack in teens by BMI category associated with GDM (N = 89,227) Underweight Normal weight Overweight aOR 95% CI aOR 95% CI aOR 95% CI Avoiding between meal and midnight snack 0.87 (0.65-1.18) 0.79 (0.70-0.89) 0.82 (0.69-0.98) Note: Bold font indicates significant result. Adjusted for maternal age, educational level, total energy intake, physical activity, smoking during pregnancy, alcohol consumption, marital status, parity, pre-pregnancy hypertension, pregnancy Page 8/16
hypertension, mental illness, and previous cesarean delivery. CI, confidence interval; OR, odds ratio Discussion The study is unique in that it analyzed the teenage weight-loss behaviors of avoiding between meal and midnight snacking. About half of the respondents chose “avoiding eating between meals and having a midnight snack” as a dietary behavior during their teenage years. It is very important to develop a diet that includes three solid meals and not too many snacks (11, 21). It has been reported that eating too many snacks prevents the body from getting minerals, fibers, and other nutrients that would otherwise be available with a healthy meal (22, 23). It is said that forming habits from an early age are central to the development of regular and healthy eating habits (24, 25). It is important to approach the parents as they influence their teenagers' eating habits (7) (8). However, parents do not always have a clear understanding of their children's diet and lifestyle (26). From the perspective of gestational maternal management, we believe that it is very important to acquire correct knowledge about diet from teenagers (27). In the future, we will be required to obtain information on snack intake and nutrition, incorporate it into our daily lives, and make decisions for ourselves (28). In this study, we focused on " avoiding between meal and midnight snacks " in teenagers. Although eating habits are ingrained in us from an early age, teenagers inevitably make more independent choices about their meals and snacks (29). Teenagers are more likely to spend their allowance freely and with autonomy. They also tend to spend more of their allowance on snacks (30). Snacking not only provides people with nutrients that they cannot obtain through food alone, but it also serves as a refreshing change of pace from work or study and gives a sense of well-being. Sweet food satisfies people's desire to eat, and for those who like sweet food, eating sweet food is an emotional experience. However, there are various risks associated with eating too much sweet food. A previous study has shown that too much added sugar can put an undue strain on the heart, regardless of whether a person is obese or not (31, 32). Additionally, sugar is one of the main causes of weight gain. It has been reported that sugar is addictive, and once a person consumes a high-calorie food (21), he or she craves more, which leads to extra calorie intake and weight gain. It is very important to control one's sugar cravings from the teenage years. GDM is caused by a genetic predisposition to type 2 diabetes (33) and insulin resistance during pregnancy (34) (especially in the second or third trimesters of pregnancy). In healthy individuals, maternal pancreatic beta cells become hypertrophic and hyperplastic in response to insulin resistance, thereby enhancing insulin secretion. Insulin resistance is caused by the breakdown of insulin in the placenta and a decrease in adiponectin levels (34). In addition, overeating and obesity may increase the risk of GDM (35). The other risk factors that predispose to GDM include a family history of diabetes (36), obesity (37), high body mass index (BMI) (38), older age (>35 years) (38), gestational hypertension, a history of delivery of a large-for-gestational-age (LGA) baby, unexplained habitual preterm labor, unexplained perinatal death, and delivery of a congenitally malformed baby. Gestational diabetes can Page 9/16
lead to complications in both infants and mothers. Maternal complications of diabetes include gestational hypertension, abnormal amniotic fluid volume, shoulder dystocia, and retinopathy, while fetal and neonatal complications include miscarriage, morphological abnormalities, giant babies, enlarged heart, hypoglycemia, polycythemia, electrolyte abnormalities, jaundice, and fetal death. To the best of our knowledge, this is the first study to show that eating behavior from the teenage years is associated with gestational diabetes. To avoid developing GDM, it is important to have a diet that avoids between meal and midnight snacks and does not lead to overweight and obesity. The main strengths of our study include the large sample size, which is representative of pregnant women in Japan, comprehensive information about maternal diet, and a wide range of potential confounding factors which were adjusted for in the models. Our study had some potential limitations. For example, owing to our exclusion criteria, our subject represented only full-term, live-born, singletons. Another potential limitation might be that our analyses relied solely on dietary information collected at a single time-point during pregnancy and the dietary intake could have changed at different pregnancy stages. However, a previous study reported no significant changes in dietary intake among pregnant Japanese women (39). The energy from FFQ may not reflect actual energy intake and may result in under- or over-reporting (40, 41). However, our analyses examined energy intake on ordinal scales, and the FFQ is a validated tool for grouping pregnant women according to high- or low-level energy intake at the population level (41). Additionally, the questionnaires used to assess diet behaviors during teenage years were not validated. However, while there are several other questions related to weight gain as a teenager, the questions used in our study are the more common actions taken to lose weight. Moreover, our analysis was adjusted for many confounders, although there may be others. There was a long time between questionnaire and response owing to the exclusion of teenagers, which may have introduced recall bias. Furthermore, we were unable to adjust for a family history of gestational diabetes. Conclusion The results suggest that weight-loss behaviors of avoiding between meal and midnight snacking as teenagers are associated with a decreased risk of developing GDM. It is important to establish appropriate snack eating habits at an early age and to acquire the correct knowledge on snacking in the dietary management of pregnancy. Abbreviations aOR, adjusted odds ratio BMI, Body Mass Index CI, Confidence Interval FFQ, Food Frequency Questionnaires Page 10/16
GDM, Gestational diabetes mellitus JECS, Japan Environment and Children's Study MET-mins/day, Metabolic Equivalent Minutes per Day Declarations Ethics approval and Consent to Participate: The JECS protocol was approved by the Institutional Review Board on Epidemiological Studies of the Ministry of the Environment and by the ethics committees of all the participating institutions, i.e., the National Institute for Environmental Studies, the National Center for Child Health and Develop‑ ment, Hokkaido University, Sapporo Medical University, Asahikawa Medi‑ cal University, Japanese Red Cross Hokkaido College of Nursing, Tohoku University, Fukushima Medical University, Chiba University, Yokohama City University, University of Yamanashi, Shinshu University, University of Toyama, Nagoya City University, Kyoto University, Doshisha University, Osaka University, Osaka Medical Center and Research Institute for Maternal and Child Health, Hyogo College of Medicine, Tottori University, Kochi University, University of Occupational and Environmental University, Kyushu University, Kumamoto University, University of Miyazaki, and University of the Ryukyus. The JECS was conducted in accordance with the Declaration of Helsinki and other nationally valid regulations. Written informed consent was obtained from all participat‑ ing mothers. Funding: This study was funded by the Ministry of the Environment, Japan. The findings and conclusions of this article are solely the responsibility of the authors and do not represent the official views of the above government. Competing interests: The authors declare that they have no competing interests. Consent for publication: Not applicable Availability of data and materials: Data are unsuitable for public deposition because of ethical considerations and restrictions as per legal framework of Japan. It is prohibited by the Act on the Protection of Personal Information (Act No. 57 of 30 May 2003, amended on 9 September 2015) to publicly deposit data containing personal information. Ethical Guidelines for Medical and Health Research Involving Human Subjects, enforced by the Japan Ministry of Education, Culture, Sports, Science and Technology and the Ministry of Health, Labour and Welfare, also restricts the open sharing of epidemiologic data. All inquiries about access to data should be addressed Dr. Shoji F. Nakayama, JECS Programme Office, National Institute for Environmental Studies, at jecs-en@nies.go.jp. Author contributions: Conceptualization, Methodology: MM; Formal analysis and interpretation: MM, TW, ME, NM, MF, and NS; Writing Original draft: MM and NS; Critical revision of the manuscript: MM, TW, ME, NM, MF, NS, and JECS group. All authors have read and approved the final manuscript. Page 11/16
Acknowledgments: The authors are grateful to all the participants in the study. We thank all staff members of the JECS. This study was funded by the Ministry of the Environment, Japan. The findings and conclusions of this article are solely the responsibility of the authors and do not represent the official views of the above government. Members of the JECS Group as of 2021: Michihiro Kamijima (principal investigator, Nagoya City University, Nagoya, Japan), Shin Yamazaki (National Institute for Environmental Studies, Tsukuba, Japan), Yukihiro Ohya (National Center for Child Health and Development, Tokyo, Japan), Reiko Kishi (Hokkaido University, Sapporo, Japan), Nobuo Yaegashi (Tohoku University, Sendai, Japan), Koichi Hashimoto (Fukushima Medical University, Fukushima, Japan), Chisato Mori (Chiba University, Chiba, Japan), Shuichi Ito (Yokohama City University, Yokohama, Japan), Zentaro Yamagata (University of Yamanashi, Chuo, Japan), Hidekuni Inadera (University of Toyama, Toyama, Japan), Takeo Nakayama (Kyoto University, Kyoto, Japan), Hiroyasu Iso (Osaka University, Suita, Japan), Masayuki Shima (Hyogo College of Medicine, Nishinomiya, Japan), Youichi Kurozawa (Tottori University, Yonago, Japan), Narufumi Suganuma (Kochi University, Nankoku, Japan), Koichi Kusuhara (University of Occupational and Environmental Health, Kitakyushu, Japan), and Takahiko Katoh (Kumamoto University, Kumamoto, Japan). We also acknowledge all members of the Environmental Medicine Department of Kochi University for their support. References 1. Kuzuya T. Early diagnosis, early treatment and the new diagnostic criteria of diabetes mellitus. Br J Nutr. 2000;84:S177-S81. doi:10.1079/09658219738864. 2. Bedell S, Hutson J, de Vrijer B, Eastabrook G. Effects of Maternal Obesity and Gestational Diabetes Mellitus on the Placenta: Current Knowledge and Targets for Therapeutic Interventions. Curr Vasc Pharmacol. 2021;19:176–92. doi:10.2174/1570161118666200616144512. 3. Tsakiridis I, Giouleka S, Mamopoulos A, Kourtis A, Athanasiadis A, Filopoulou D, et al. Diagnosis and Management of Gestational Diabetes Mellitus: An Overview of National and International Guidelines. Obstet Gynecol Surv. 2021;76:367–81. doi:10.1097/OGX.0000000000000899. 4. Tsirou E, Grammatikopoulou MG, Theodoridis X, Gkiouras K, Petalidou A, Taousani E, et al. Guidelines for Medical Nutrition Therapy in Gestational Diabetes Mellitus: Systematic Review and Critical Appraisal. J Acad Nutr Diet. 2019;119:1320–39. doi:10.1016/j.jand.2019.04.002. 5. Dong JY, Ikehara S, Kimura T, Cui M, Kawanishi Y, Kimura T, et al. Skipping breakfast before and during early pregnancy and incidence of gestational diabetes mellitus: the Japan Environment and Children's Study. Am J Clin Nutr. 2020;111:829–34. doi:10.1093/ajcn/nqaa014. 6. Scaglioni S, De Cosmi V, Ciappolino V, Parazzini F, Brambilla P, Agostoni C. Factors Influencing Children’s Eating Behaviours. Nutrients. 2018;10:706. doi:10.3390/nu10060706. 7. Mahmood L, Flores-Barrantes P, Moreno LA, Manios Y, Gonzalez-Gil EM. The Influence of Parental Dietary Behaviors and Practices on Children's Eating Habits. Nutrients. 2021;13:1138. doi:10.3390/nu13041138. Page 12/16
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Figure 1 Flowchart for selection of participants from JECS JECS = Japan Environment and Children’s Study Page 16/16
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