Food Insecurity and Changes in Diet Quality and Body Mass Index z-Scores Among Elementary School Students.

Background: Previous research has identified food insecurity as a risk factor for obesity but those studies employed cross-sectional designs and were largely focused on adults and young children. In addition, there is a paucity of studies examining the association between food insecurity and changes in children's overall diet quality. This study aimed to assess whether food insecurity is associated with subsequent changes in diet quality and BMI z-scores over 2 years among 7- to 12-year-old children. Methods: We used 2011-2019 secondary data (n = 404) from three randomized controlled trials in Minnesota. Food insecurity was identified using the U.S. Household Food Security Survey Module at baseline (Time 0). Diet quality was determined using the Healthy Eating Index (HEI)-2015 from 24-hour recalls, and BMI z-scores were calculated using measured height and weight. These two outcomes were measured at Time 0, Time 1 (10-12 months from Time 0), and Time 2 (15-24 months from Time 0). Results: Compared with children from food-secure households, those from food-insecure households experienced a 0.13 greater increase in BMI z-scores from Time 0 to Time 2 [95% confidence interval (CI): 0.04 to 0.21] and a 4.5 point increase in HEI-2015 from Time 0 to Time 1 (95% CI: 0.99 to 8.01). Conclusion: Household food insecurity may widen weight disparities among elementary school-aged children. Further studies are needed to identify the role of diet quality in weight changes among children with food insecurity. Clinical Trial Registration Number: NCT01538615, NCT02029976, NCT02973815.

More-To-Less Home Healthful Foods Ratio is Associated With Diet Quality in Preadolescents With Elevated Body Mass Index.

OBJECTIVE: To examine home food availability (HFA) and the association with diet quality in preadolescents with elevated body mass index. METHODS: A cross-sectional analysis examined HFA and diet quality (using the 2015-Health Eating Index [HEI] derived from 1 or 2 24-hour dietary recalls) among preadolescents (n = 111; aged 8-12 years; body mass index ≥ 75th percentile). A novel ratio of more-to-less healthful items was created to represent HFA. Multivariate linear regression models examined the HFA ratio and individual food and beverage groups as correlates of HEI. RESULTS: The HFA ratio was associated with higher HEI (ß = 5.3 [1.3]; P < 0.001). Home food availability of sweets (ß = -2.6 [0.9]; P = 0.003) and sugar-sweetened beverages (ß = -2.3 [1.0]; P = 0.02) were associated with lower HEI. Home food availability of fruits was associated with higher HEI (ß = 1.3 [0.7]; P = 0.05). CONCLUSIONS AND IMPLICATIONS: Structuring the HFA so that more healthful choices are available relative to less healthful foods could be an effective approach for improving diet quality in preadolescents at risk for obesity.

Fruit and Vegetable Snack Consumption Among Children With a Body Mass Index at or Above the 75th Percentile.

OBJECTIVE: To describe fruit and vegetable (FV) consumption as snacks and the association with diet quality and compare the snacking environment and child and parent characteristics between children who consumed FV as snacks and those who did not. METHODS: This secondary analysis study used baseline data from a healthy weight management study with 8- to 12-year-old children with a body mass index ≥75th percentile. Data collection included 24-hour dietary recalls, measured height/weight, and child and parent surveys. RESULTS: Children (n = 119) consumed 0.1 cup equivalent per 1,000 kcal of FV as snacks, the equivalent of 16.9% of their daily FV consumption. More FV consumption as snacks occurred at home when a parent was present and was associated with higher parent support for FV consumption as snacks (P = 0.03). CONCLUSIONS AND IMPLICATIONS: Renewed attention to strategies to promote FV consumption as snacks, especially at away-from-home locations, is merited.

School-Based Secondary Obesity Prevention for Eight- to Twelve-Year-Olds: Results from the Students, Nurses, and Parents Seeking Healthy Options Together Randomized Trial.

Objective: The primary aim of this randomized controlled trial, conducted in Minneapolis/St. Paul, Minnesota (2014-2019), was to evaluate the effects of a school-based, school nurse-delivered, secondary obesity prevention intervention to reduce excess weight gain among preadolescent children with obesity or at risk of developing obesity. Methods: Parent/child dyads (n = 132) were randomized to the 9-month Students, Nurses, and Parents Seeking Healthy Options Together (SNAPSHOT) intervention (32.5 contact hours) or newsletter-only control group. Eligible children were 8 to 12 years old, proficient in English, and with a BMI ≥75th percentile, calculated using height/weight reported by a parent, school nurse, or clinician. The primary outcome was child BMI for sex/age z-score (BMIz) at postintervention (12 months) and follow-up (24 months). Results: Among children, 63% were non-White, 51% were male, and 51% with obesity, including 21% with severe obesity. Among families, 59% received economic assistance and 30% reported food insecurity. The mean number of intervention contact hours received was 20 (range: 0-32.5). Among dyads (n = 54) receiving the intervention, parents were very satisfied/satisfied with SNAPSHOT and SNAPSHOT staff, 96% and 100%, respectively, and very likely/likely (97%) to recommend SNAPSHOT to others. Most (70%) children liked the kid group sessions "a lot." In an intent-to-treat analysis, there were no significant between-group differences in child BMIz at 12 [0.04; 95% confidence interval (CI) -0.07 to 0.16] or 24 months (0.06; 95% CI -0.08 to 0.20), with participant retention of 92% and 93%, respectively. Conclusions: The SNAPSHOT intervention was well received, but did not improve BMI in a mostly diverse, low-income preadolescent population. Approaches to intervention delivery that are feasible, maximize accessibility, and optimize clinician and school nurse collaboration warrant consideration. Clinical trial registration identifier NCT02029976.

Missed Work Among Caregivers of Children With a High Body Mass Index: Child, Parent, and Household Characteristics.

An underexamined consequence of childhood obesity is caregivers' missed work attributed to child absence from school due to a health condition. This secondary analysis (N = 123) reported the frequency of missed work among caregivers of children with a body mass index (BMI) at or above the 75th percentile and examined associations with select child, parent, and household characteristics. Caregivers missed work 1.3 (SD = 1.2) times in the past year with 41% reporting 2 or more times. A child visiting a health-care provider 2 or more times in the past year and parent perception of their child's health as good/fair/poor were significantly associated with caregivers' missing work 2 or more times in a year (OR = 5.8 and OR = 3.0, respectively). A significant association between children's physical and psychosocial well-being and caregivers' missed work emphasizes the school nurse role working with children with high BMI and families to address student absenteeism and caregivers' missed work.

Sleep is Inversely Associated with Sedentary Time among Youth with Obesity.

Objective: Pathways underlying the sleep-obesity relationship in youth are poorly understood. In this study, we examined associations of sleep with sedentary time and moderate-to-vigorous physical activity (MVPA) among youth, stratified by weight category (obesity versus no obesity). A sub-aim examined whether controlling for screen time changed the sleep-sedentary time association. Methods: Methods entailed secondary analysis of baseline data collected June-August 2014-2017 during a school-based healthy weight management trial in Minneapolis/St. Paul, Minnesota. Participants (N = 114) were 8-to-12 years old with BMI ≥ 75th percentile, most of whom were members of racial/ethnic minority groups (57%) or from households receiving economic assistance (55%). Mean nightly sleep duration and daily screen time were measured by survey, MVPA and sedentary time by accelerometer, and height and weight by research staff. Multivariate linear regression examined associations of sleep with sedentary time and MVPA. Results: Sleep was inversely associated with hours of sedentary time (ß = -1.34 [-2.11, -0.58] p = .001) and percent of time spent sedentary (ß = -2.92 [-4.83, -1.01], p = .004), for youth with obesity only. The association was unchanged by screen time. Sleep was not significantly associated with MVPA in total sample or stratified models. Conclusions: Associations among sleep, activity levels, and obesity may differ based upon movement type (sedentary time vs MVPA) and weight category (obesity vs no obesity).

The Association between Parents and Children Meeting Physical Activity Guidelines.

PURPOSE: To examine the association between parents and children meeting physical activity (PA) guidelines, by gender, among 8-12 year old children with BMI ≥75th percentile DESIGN AND METHODS: This was a secondary analysis of baseline data from a school-based healthy weight management intervention in Minnesota for 8-12 year old children. Survey data about PA participation were collected from 2014 through 2018. Analyses entailed descriptive statistics and multivariate logistic regression controlling for child age, race/ethnicity, BMIz, child's perception of parent support for activity, and number of sports played. RESULTS: Children's (n = 132) mean age was 9.32 ± 0.89 years, 49% were female, 63% were members of racial/ethnic minority groups, and 33% met PA Guidelines (≥60 minutes daily). Parents' (n = 132) mean age was 39.11 ± 7.05 years, mean BMI of 30.90 ± 8.44, 94% were female, 42% were members of racial/ethnic minority groups, and 57% met PA Guidelines for Americans (≥150 minutes moderate or >75 minutes vigorous PA weekly). There was no association between parents and children meeting PA guidelines for the total sample (OR = 1.43, 95% CI = 0.63-3.24, p = 0.39) or girls (OR = 0.65, 95% CI = 0.18-2.33, p = 0.51). Boys whose parents met PA guidelines had 3.84 times greater odds of meeting PA guidelines (95% CI = 1.28-13.4, p = 0.04). CONCLUSIONS: PA interventions for boys may benefit from focus on parents' PA. Further research should investigate correlates of girls' PA. PRACTICE IMPLICATIONS: Pediatric nurses working with children to increase PA should encourage parents' PA. For parents of boys, this may increase the child's PA. Considered broadly, nurses should be aware of gender influences on children's engagement in PA.

Self-Efficacy, Not Peer or Parent Support, Is Associated With More Physical Activity and Less Sedentary Time Among 8- to 12-Year-Old Youth With Elevated Body Mass Index.

BACKGROUND: Youth experience a decrease in physical activity (PA) and an increase in sedentary time during adolescence. Better understanding of factors associated with activity levels during preadolescence may inform interventions to minimize decline. This study compared the association of self-efficacy for PA, parent support for PA, and peer support for PA with moderate-to-vigorous PA (MVPA) and sedentary time among 8- to 12-year-old children with body mass index ≥75th percentile. METHODS: This study analyzed baseline data from a school-based healthy weight management intervention trial, conducted in metropolitan Minnesota. Self-efficacy for PA, parent support for PA, and peer support for PA were measured by child survey using reliable tools. MVPA and sedentary time were measured using accelerometer. RESULTS: Participants included 114 children; mean age was 9.4 (0.9) years, 51% were females, 55% received public assistance, and 57% were racial/ethnic minorities. Self-efficacy for PA was positively associated with moderate to vigorous PA for girls (ß = 1.83, P < .01) and inversely with sedentary time for the total sample (ß = -7.00, P = .03). Parent support for PA was positively associated with sedentary time for girls (ß = 9.89, P = .04) and the total sample (ß = 7.83, P = .04). CONCLUSIONS: Interventions for preadolescents with elevated body mass index may improve activity levels by increasing self-efficacy for PA.

The Identification of Family Social Environment Typologies Using Latent Class Analysis: Implications for Future Family-Focused Research.

The family social environment is the first environment that a child experiences and has implications for children's health. However, the majority of family social environment measures do not account for its complexity. There is a need for novel approaches for assessing the family social environment that transcends the traditional way of measuring family composition and interaction. The purpose of this secondary data analysis research was to identify distinct family social environment typologies that consider both family composition and interaction and to describe the characteristics of the identified family social environment typologies. A series of latent class analysis results indicated three distinct typologies of family social environment with significant differences in family composition, family problem-solving skills, and demographic characteristics. The process used to identify the typologies and significant differences between the typologies showcases how the field could advance family-focused research by considering family composition and interaction.

Diet Quality and Fruit, Vegetable, and Sugar-Sweetened Beverage Consumption by Household Food Insecurity among 8- to 12-Year-Old Children during Summer Months.

BACKGROUND: School-delivered nutrition assistance programs have improved dietary intake for children from food-insecure households during the school year. However, little is known about their diet quality and eating patterns during summer months. OBJECTIVE: School-aged children's summer month weekday and weekend day diet quality and eating patterns were assessed by household food insecurity. DESIGN: Secondary analysis of cross-sectional data was employed. PARTICIPANTS/SETTING: During the summers of 2011 through 2017, baseline data were collected from parent-child dyads participating in one of two community-based obesity prevention trials in metropolitan Minnesota (N=218). The mean age of children was 10 years; 50% were girls, 49% were nonwhite, and 25% were from food-insecure households. MAIN OUTCOME MEASURES: Children from food-secure and food-insecure households were identified by using the short form of the US Household Food Security Survey. Healthy Eating Index 2015 and eating patterns-including energy intake and consumption of whole fruits, vegetables, 100% fruit/vegetable juice, and sugar-sweetened beverages-were estimated by means of 24-hour dietary recall interviews conducted on weekdays and weekend days. STATISTICAL ANALYSIS PERFORMED: General linear modeling was used to examine diet quality and eating patterns by food insecurity, controlling for child age, child body mass index z score, and parent education. RESULTS: Children from food-insecure and food-secure households had Healthy Eating Index 2015 scores less than 50. Children from food-insecure households reported less energy intake, fewer cups of whole fruit, and more sugar-sweetened beverage consumption for every 1,000 kcal consumed on a weekend day when compared with their counterparts from food-secure households (P<0.05). Similar results were not seen for weekday eating patterns. CONCLUSIONS: Whole fruit and sugar-sweetened beverage consumption varied by food insecurity on weekend days during summer months. Because children tend to gain weight during summer months, efforts to increase weekend access to whole fruits and promote water consumption may contribute to weight gain prevention and healthy development, especially for children from food-insecure households.

A Group Randomized Intervention Trial Increases Participation in the School Breakfast Program in 16 Rural High Schools in Minnesota.

BACKGROUND: Breakfast consumption is associated with better diet quality and healthier weights, yet many adolescents miss breakfast. Nationally, 17.1% of students participate in the School Breakfast Program (SBP). Only 10% of high school students participate. OBJECTIVE: Our aim was to evaluate an environmental intervention to increase SBP participation in high schools. DESIGN: A group randomized trial was carried out from 2012 to 2015. PARTICIPANTS/SETTING: Ninth- and 10th-grade students enrolled in 16 rural schools in Minnesota (median 387 students) were randomized to intervention or control condition. INTERVENTION: A school-based intervention that included two key components was implemented over a 12-month period. One component focused on increasing SBP participation by increasing student access to school breakfast through changes in school breakfast service practices (eg, serving breakfast from a grab-n-go cart in the atrium; expanding breakfast service times). The other component focused on promoting school breakfast through student-directed marketing campaigns. MAIN OUTCOME MEASURE: Change in school-level participation in the SBP was assessed between baseline (among ninth and tenth graders) and follow-up (among tenth and eleventh graders). School meal and attendance records were used to assess change in school-level participation rates in the SBP. STATISTICAL ANALYSES: The Wilcoxon test was used for analysis of difference in change in mean SBP participation rate by experimental group. RESULTS: The median change in SBP participation rate between baseline and follow-up was 3% (interquartile range=13.5%) among the eight schools in the intervention group and 0.5% (interquartile range=0.7%) among the eight schools in the control group. This difference in change between groups was statistically significant (Wilcoxon test, P=0.03). The intervention effect increased throughout the intervention period, with change in mean SBP participation rate by the end of the school year reaching 10.3% (95% CI 3.0 to 17.6). However, among the intervention schools, the change in mean SBP participation rates was highly variable (range=-0.8% to 24.8%). CONCLUSIONS: Interventions designed to improve access to the SBP by reducing environmental and social barriers have potential to increase participation among high school students.

School-based secondary prevention of overweight and obesity among 8- to 12-year old children: Design and sample characteristics of the SNAPSHOT trial.

Rising levels of severe obesity among children, worsening disparities by race and ethnicity and reluctance of primary care clinicians' to provide obesity management to children are compelling reasons to consider alternatives to primary care management of childhood obesity. The Students Nurses and Parents Seeking Healthy Options Together (SNAPSHOT) trial will test the efficacy of an elementary school-based, school nurse-led, healthy weight management program to reduce excess weight gain among children, 8- to 12-years old with a body mass index (BMI) ≥75th percentile, by increasing healthy dietary practices and physical activity and decreasing sedentary behaviors. SNAPSHOT has enrolled and randomized 132 child/parent dyads to either the: (1) 9-month SNAPSHOT intervention that includes four home visits, 14 kid groups held during out-of-school time and five parent groups or (2) a newsletter program consisting of monthly mailings and family-focused healthy lifestyle information. Outcomes are assessed at baseline, 12-months (post intervention) and 24-months (follow-up) post randomization. The primary outcome is child age- and gender-adjusted BMI z-score. Secondary outcomes include child dietary intake assessed with 24-h dietary recall interviews and accelerometer-measured activity levels. The SNAPSHOT intervention is a model of secondary obesity prevention for children that addresses the urgent need for theory-informed, evidence-based and safe weight management programs, delivered by skilled health professionals in accessible settings. This report describes development of the SNAPSHOT trial, including recruitment and randomization procedures, assessments, intervention and implementation plans, and baseline characteristics of the study sample.

A comparison of the vending environment among three rural subtypes of secondary schools.

The purpose of this study was to further explore the rural school food environment. This study assessed trends in prevalence of vending machines and vending items within and between Minnesota schools located in 3 rural subtypes: town/rural fringe, town/rural distant, and remote rural. Generalized estimating equation models were employed to analyze data from the 2006 through 2012 School Health Profiles Principal's Surveys (Profiles). All 3 rural subtypes had a statistically significant decrease in the prevalence of low nutrient energy dense (LNED) vending items between 2006 and 2012, with the exception of sports drinks. However, different vending practices were observed between rural subtypes, with town/rural fringe schools providing more LNED vending options and experiencing less positive change over time compared to town/rural distant and remote rural schools. Differences in vending machine practices emerge when rural schools are subtyped.

Media Devices in Parents' and Children's Bedrooms and Children's Media Use.

OBJECTIVES: The American Academy of Pediatrics advises having no media devices in children's bedrooms. We examined the link between media devices in parents' and children's bedrooms and children's media use. METHODS: Ninety parent-child dyads participated in a community- based healthy weight management study targeting 8-to-12-year-olds with body mass index (BMI)-for-age ≥75th percentile. Parents and children reported the number of media devices in their bedrooms and hours spent using media devices on weekdays and weekend days. RESULTS: Most children (61%) and parents (92%) had at least one media device in their bedrooms. The numbers of devices in parents' and children's bedrooms were positively correlated. Children with no bedroom media devices reported less weekday media use compared to children with bedroom devices. A similar non-significant pattern was found for children's weekend media use. CONCLUSIONS: Study findings indicate similar media devices in the bedrooms of parents and children and a significant association between media devices in children's bedrooms and their weekday media use. Efforts to reduce media in parent bedrooms may enhance interventions targeting reduction of media use among children, especially those with higher BMI.

Family Home Food Environment and Nutrition-Related Parent and Child Personal and Behavioral Outcomes of the Healthy Home Offerings via the Mealtime Environment (HOME) Plus Program: A Randomized Controlled Trial.

BACKGROUND: Research has demonstrated a significant positive association between frequent family meals and children's dietary intake; however, the promotion of healthful family meals has not been rigorously tested for key food environment and nutrition-related behavioral outcomes in a randomized trial. OBJECTIVE: To describe family home food environment and nutrition-related parent and child personal and behavioral outcomes of the Healthy Home Offerings via the Mealtime Environment Plus program, the first rigorously tested family meals intervention targeting childhood obesity prevention. DESIGN: Randomized controlled trial. Baseline, postintervention (12 months, 93% retention), and follow-up (21 months, 89% retention) data (surveys and dietary recalls) were collected. PARTICIPANTS/SETTING: Children aged 8 to 12 years (N=160) and their parents were randomized to intervention (n=81) or control (n=79) groups. INTERVENTION: The intervention included five parent goal-setting calls and 10 monthly sessions delivered to families in community settings that focused on experiential nutrition activities and education, meal planning, cooking skill development, and reducing screen time. MAIN OUTCOME MEASURES: Family home food environment outcomes and nutrition-related child and parent personal and behavioral outcomes. STATISTICAL ANALYSES PERFORMED: Analyses used generalized linear mixed models. Primary comparisons were contrasts between intervention and control groups at postintervention and follow-up, with adjustments for child age and parent education. RESULTS: Compared with control parents, intervention parents showed greater improvement over time in scores of self-efficacy for identifying appropriate portion sizes, with significant differences in adjusted means at both post-intervention (P=0.002) and follow-up (P=0.01). Intervention children were less likely to consume at least one sugar-sweetened beverage daily at post-intervention than control children (P=0.04). CONCLUSIONS: The Healthy Home Offerings via the Mealtime Environment Plus program involved the entire family and targeted personal, behavioral, and environment factors important for healthful changes in the home food environment and children's dietary intake. The intervention improved two nutrition-related behaviors and this may inform the design of future family meal interventions.

Association Between Parent Television-Viewing Practices and Setting Rules to Limit the Television-Viewing Time of Their 8- to 12-Year-Old Children, Minnesota, 2011-2015.

INTRODUCTION: Television (TV) viewing is popular among adults and children, and child TV-viewing time is positively associated with parent TV-viewing time. Efforts to limit the TV-viewing time of children typically target parent rule-setting. However, little is known about the association between parent TV-viewing practices and rule-setting. METHODS: We used baseline height and weight data and survey data collected from 2011 through 2015 on parents and their 8- to 12-year-old children (N = 212 parent/child dyads) who were participants in 2 community-based obesity prevention intervention trials conducted in metropolitan Minnesota. Multivariable binary logistic regression analysis was used to assess the association between parent TV-viewing time on weekdays or weekend days (dichotomized as ≤2 hrs/d vs ≥2.5 hrs/d) and parent rules limiting child TV-viewing time. RESULTS: Child mean age was 10 (standard deviation [SD], 1.4) years, mean body mass index (BMI) percentile was 81 (SD, 16.7), approximately half of the sample were boys, and 42% of the sample was nonwhite. Parent mean age was 41 (SD, 7.5) years, and mean BMI was 29 (SD, 7.5); most of the sample was female, and 36% of the sample was nonwhite. Parents who limited their TV-viewing time on weekend days to 2 hours or fewer per day were almost 3 times more likely to report setting rules limiting child TV-viewing time than were parents who watched 2.5 hours or more per day (P = .01). A similar association was not seen for parent weekday TV-viewing time. CONCLUSION: For most adults and children, a meaningful decrease in sedentariness will require reductions in TV-viewing time. Family-based interventions to reduce TV-viewing time that target the TV-viewing practices of both children and parents are needed.

Disparities in Supports for Student Wellness Promotion Efforts Among Secondary Schools in Minnesota.

BACKGROUND: We examined whether there are differences in the presence of supports for student wellness promotion (1) between schools in city, suburban and rural locations and, (2) among rural schools, according to distance from a metropolitan center. METHODS: The analysis was conducted in a sample of 309 secondary schools using 2012 Minnesota School Health Profiles surveys and National Center for Educational Statistics Common Core Data. Scores for overall support addressed school health improvement coordination (range: 0-29), collaboration on health education activities (range: 0-5), and teachers' professional preparation (range: 0-7). RESULTS: Mean overall scores for health improvement coordination (10.5 ± 7.3), collaboration on health education activities (3.0 ± 1.5) and professional preparation (4.0 ± 1.9) indicated supports are lacking in schools across city, suburban, and rural locations. Comparison of overall scores did not identify disparities; however, weaknesses and strengths of particular relevance for rural schools were identified in examining specific aspects of support. For example, the proportion of rural schools having a written school improvement plan was 54.8% compared to 84.6% of city schools and 64.3% of suburban schools (p = .01). CONCLUSIONS: Tailored training and technical assistance are needed to better support schools in implementing recommended wellness policies and practices.

School-Based Obesity-Prevention Policies and Practices and Weight-Control Behaviors among Adolescents.

BACKGROUND: The promotion of healthy eating and physical activity within school settings is an important component of population-based strategies to prevent obesity; however, adolescents may be vulnerable to weight-related messages, as rapid development during this life stage often leads to preoccupation with body size and shape. OBJECTIVE: This study examines secular trends in secondary school curricula topics relevant to the prevention of unhealthy weight-control behaviors; describes cross-sectional associations between weight-related curricula content and students' use of weight-control behaviors; and assesses whether implementation of school-based obesity-prevention policies/practices is longitudinally related to students' weight-control behaviors. DESIGN: The Minnesota School Health Profiles and Minnesota Student Survey (grades 9 and 12) data were used along with National Center for Education Statistics data to examine secular trends, cross-sectional associations (n=141 schools), and longitudinal associations (n=42 schools). MAIN OUTCOME MEASURES: Students self-reported their height and weight along with past-year use of healthy (eg, exercise), unhealthy (eg, fasting), and extreme (eg, use laxatives) weight-control behaviors. STATISTICAL ANALYSES PERFORMED: Descriptive statistics, generalized estimating equations, and generalized linear regression models accounting for school-level demographics. RESULTS: There was no observable pattern during the years 2008 to 2014 in the mean number of curricula topics addressing unhealthy weight-control behaviors, despite an increase in the prevalence of curricula addressing acceptance of body-size differences. Including three vs fewer weight-control topics and specifically including the topic of eating disorders in the curricula was related to a lower school-level percent of students using any extreme weight-control behaviors. In contrast, an overall measure of implementing school-based obesity-prevention policies/practices (eg, prohibited advertising) was unrelated to use of unhealthy or extreme behaviors. CONCLUSIONS: Results suggest obesity-prevention policies/practices do not have unintended consequences for student weight-control behaviors and support the importance of school-based health education as part of efforts to prevent unhealthy behaviors.