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Background Prevention of obesity in children is an international public health priority given the prevalence of the condition (and its significant impact on health, development and well‐being). Interventions that aim to prevent obesity involve behavioural change strategies that promote healthy eating or 'activity' levels (physical activity, sedentary behaviour and/or sleep) or both, and work by reducing energy intake and/or increasing energy expenditure, respectively. There is uncertainty over which approaches are more effective and numerous new studies have been published over the last five years, since the previous version of this Cochrane review. Objectives To assess the effects of interventions that aim to prevent obesity in children by modifying dietary intake or ‘activity’ levels, or a combination of both, on changes in BMI, zBMI score and serious adverse events. Search methods We used standard, extensive Cochrane search methods. The latest search date was February 2023. Selection criteria Randomised controlled trials in children (mean age 5 years and above but less than 12 years), comparing diet or 'activity' interventions (or both) to prevent obesity with no intervention, usual care, or with another eligible intervention, in any setting. Studies had to measure outcomes at a minimum of 12 weeks post baseline. We excluded interventions designed primarily to improve sporting performance. Data collection and analysis We used standard Cochrane methods. Our outcomes were body mass index (BMI), zBMI score and serious adverse events, assessed at short‐ (12 weeks to < 9 months from baseline), medium‐ (9 months to < 15 months) and long‐term (≥ 15 months) follow‐up. We used GRADE to assess the certainty of the evidence for each outcome. Main results This review includes 172 studies (189,707 participants); 149 studies (160,267 participants) were included in meta‐analyses. One hundred forty‐six studies were based in high‐income countries. The main setting for intervention delivery was schools (111 studies), followed by the community (15 studies), the home (eight studies) and a clinical setting (seven studies); one intervention was conducted by telehealth and 31 studies were conducted in more than one setting. Eighty‐six interventions were implemented for less than nine months; the shortest was conducted over one visit and the longest over four years. Non‐industry funding was declared by 132 studies; 24 studies were funded in part or wholly by industry. Dietary interventions versus control Dietary interventions, compared with control, may have little to no effect on BMI at short‐term follow‐up (mean difference (MD) 0, 95% confidence interval (CI) ‐0.10 to 0.10; 5 studies, 2107 participants; low‐certainty evidence) and at medium‐term follow‐up (MD ‐0.01, 95% CI ‐0.15 to 0.12; 9 studies, 6815 participants; low‐cer...
Background Prevention of obesity in children is an international public health priority given the prevalence of the condition (and its significant impact on health, development and well‐being). Interventions that aim to prevent obesity involve behavioural change strategies that promote healthy eating or 'activity' levels (physical activity, sedentary behaviour and/or sleep) or both, and work by reducing energy intake and/or increasing energy expenditure, respectively. There is uncertainty over which approaches are more effective and numerous new studies have been published over the last five years, since the previous version of this Cochrane review. Objectives To assess the effects of interventions that aim to prevent obesity in children by modifying dietary intake or ‘activity’ levels, or a combination of both, on changes in BMI, zBMI score and serious adverse events. Search methods We used standard, extensive Cochrane search methods. The latest search date was February 2023. Selection criteria Randomised controlled trials in children (mean age 5 years and above but less than 12 years), comparing diet or 'activity' interventions (or both) to prevent obesity with no intervention, usual care, or with another eligible intervention, in any setting. Studies had to measure outcomes at a minimum of 12 weeks post baseline. We excluded interventions designed primarily to improve sporting performance. Data collection and analysis We used standard Cochrane methods. Our outcomes were body mass index (BMI), zBMI score and serious adverse events, assessed at short‐ (12 weeks to < 9 months from baseline), medium‐ (9 months to < 15 months) and long‐term (≥ 15 months) follow‐up. We used GRADE to assess the certainty of the evidence for each outcome. Main results This review includes 172 studies (189,707 participants); 149 studies (160,267 participants) were included in meta‐analyses. One hundred forty‐six studies were based in high‐income countries. The main setting for intervention delivery was schools (111 studies), followed by the community (15 studies), the home (eight studies) and a clinical setting (seven studies); one intervention was conducted by telehealth and 31 studies were conducted in more than one setting. Eighty‐six interventions were implemented for less than nine months; the shortest was conducted over one visit and the longest over four years. Non‐industry funding was declared by 132 studies; 24 studies were funded in part or wholly by industry. Dietary interventions versus control Dietary interventions, compared with control, may have little to no effect on BMI at short‐term follow‐up (mean difference (MD) 0, 95% confidence interval (CI) ‐0.10 to 0.10; 5 studies, 2107 participants; low‐certainty evidence) and at medium‐term follow‐up (MD ‐0.01, 95% CI ‐0.15 to 0.12; 9 studies, 6815 participants; low‐cer...
Background Prevention of obesity in adolescents is an international public health priority. The prevalence of overweight and obesity is over 25% in North and South America, Australia, most of Europe, and the Gulf region. Interventions that aim to prevent obesity involve strategies that promote healthy diets or ‘activity’ levels (physical activity, sedentary behaviour and/or sleep) or both, and work by reducing energy intake and/or increasing energy expenditure, respectively. There is uncertainty over which approaches are more effective, and numerous new studies have been published over the last five years since the previous version of this Cochrane Review. Objectives To assess the effects of interventions that aim to prevent obesity in adolescents by modifying dietary intake or ‘activity’ levels, or a combination of both, on changes in BMI, zBMI score and serious adverse events. Search methods We used standard, extensive Cochrane search methods. The latest search date was February 2023. Selection criteria Randomised controlled trials in adolescents (mean age 12 years and above but less than 19 years), comparing diet or 'activity' interventions (or both) to prevent obesity with no intervention, usual care, or with another eligible intervention, in any setting. Studies had to measure outcomes at a minimum of 12 weeks post baseline. We excluded interventions designed primarily to improve sporting performance. Data collection and analysis We used standard Cochrane methods. Our outcomes were BMI, zBMI score and serious adverse events, assessed at short‐ (12 weeks to < 9 months from baseline), medium‐ (9 months to < 15 months) and long‐term (≥ 15 months) follow‐up. We used GRADE to assess the certainty of the evidence for each outcome. Main results This review includes 74 studies (83,407 participants); 54 studies (46,358 participants) were included in meta‐analyses. Sixty studies were based in high‐income countries. The main setting for intervention delivery was schools (57 studies), followed by home (nine studies), the community (five studies) and a primary care setting (three studies). Fifty‐one interventions were implemented for less than nine months; the shortest was conducted over one visit and the longest over 28 months. Sixty‐two studies declared non‐industry funding; five were funded in part by industry. Dietary interventions versus control The evidence is very uncertain about the effects of dietary interventions on body mass index (BMI) at short‐term follow‐up (mean difference (MD) ‐0.18, 95% confidence interval (CI) ‐0.41 to 0.06; 3 studies, 605 participants), medium‐term follow‐up (MD ‐0.65, 95% CI ‐1.18 to ‐0.11; 3 studies, 900 participants), and standardised BMI (zBMI) at long‐term follow‐up (MD ‐0.14, 95% CI ‐0.38 to 0.10; 2 studies, 1089 participants); all very low‐certainty evidence. Compared wit...
Background American Indian children are at increased risk for obesity and diabetes. School-based health promotion interventions are one approach to promoting healthy behaviors to reduce this risk, yet few studies have described their implementation and fidelity. We conducted a qualitative process evaluation of the Yéego! Healthy Eating and Gardening Program, a school-based intervention to promote healthy eating among Navajo elementary school children. The intervention included a yearlong integrated curriculum, as well as the construction and maintenance of a school-based garden. Methods Our process evaluation included fidelity checklists completed by program staff and qualitative interviews with program staff and classroom teachers after the intervention was implemented. We used content analysis to identify themes. Results We identified several themes related to evidence of delivery adherence, program satisfaction, and lessons learned about delivery. Intervention staff followed similar procedures to prepare for and deliver lessons, but timing, teaching styles, and school-level factors also impacted overall implementation fidelity. Teachers and students had positive perceptions of the program, especially lessons that were highly visual, experiential, and connected to Navajo culture and the surrounding community. Teachers and program staff identified ways to enhance the usability of the curriculum by narrowing the scope, relating content to student experiences, and aligning content with school curriculum standards. Conclusions The program was implemented with moderately high fidelity across contexts. We identified areas where modifications could improve engagement, acceptability, efficacy, and sustainability of the program. Our results have implications for the evaluation and dissemination of school-based health interventions to promote healthy eating among children, especially in American Indian communities.
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