BACKGROUND: Prevention of childhood obesity is an international public health priority given the significant impact of obesity on acute and chronic diseases, general health, development and well-being. The international evidence base for strategies that governments, communities and families can implement to prevent obesity, and promote health, has been accumulating but remains unclear. OBJECTIVE: This review primarily aims to update the previous Cochrane review of childhood obesity prevention research and determine the effectiveness of evaluated interventions intended to prevent obesity in children, assessed by change in Body Mass Index (BMI). Secondary aims were to examine the characteristics of the programs and strategies to answer the questions "What works for whom, why and for what cost?" METHODS: Search methods: The searches were re-run in CENTRAL, MEDLINE, EMBASE, PsychINFO and CINAHL in March 2010 and searched relevant websites. Non-English language papers were included and experts were contacted. Selection criteria: The review includes data from childhood obesity prevention studies that used a controlled study design (with or without randomisation). Studies were included if they evaluated interventions, policies or programs in place for twelve weeks or more. If studies were randomized at a cluster level, six clusters were required. Data collection and analysis: Two review authors independently extracted data and assessed the risk of bias of included studies. Data was extracted on intervention implementation, cost, equity and outcomes. Outcome measures were grouped according to whether they measured adiposity, physical activity (PA)-related behaviours or diet-related behaviours. Adverse outcomes were recorded. A meta-analysis was conducted using available BMI or standardized BMI (zBMI) score data with subgroup analysis by age group (0-5, 6-12, 13-18 years, corresponding to stages of developmental and childhood settings). MAIN RESULTS: This review includes 55 studies (an additional 36 studies found for this update). The majority of studies targeted children aged v 6-12 years. The meta-analysis included 37 studies of 27,946 children and demonstrated that programmes were effective at reducing adiposity, although not all individual interventions were effective, and there was a high level of observed heterogeneity (I2 = 82%). Overall, children in the intervention group had a standardised mean difference in adiposity (measured as BMI or zBMI) of -0.15kg/m2 (95% confidence interval (CI): -0.21 to -0.09). Intervention effects by age subgroups were -0.26kg/m2 (95% CI -0.53 to 0.00) (0- 5 years), - 0.15 kg/m2 (95% CI -0.23 to -0.08) (6-12 years), and -0.09 kg/m2 (95% CI -0.20 to 0.03) (13-18 years). Heterogeneity was apparent in all three age groups and could not explained by randomisation status or the type, duration or setting of the intervention. Only eight studies reported on adverse effects and no evidence of adverse outcomes such as unhealthy dieting practices, increased prevalence of underweight or body image sensitivities was found. Interventions did not appear to increase health inequalities although this was examined in fewer studies. AUTHORS' CONCLUSIONS: We found strong evidence to support beneficial effects of child obesity prevention programmes on BMI, particularly for programmes targeted to children aged six to 12 years. However, given the unexplained heterogeneity and the likelihood of small study bias, these findings must be interpreted cautiously. A broad range of programme components were used in these studies and whilst it is not possible to distinguish which of these components contributed most to the beneficial effects observed, our synthesis indicates the following to be promising policies and strategies: school curriculum that includes healthy eating, physical activity and body image; increased sessions for physical activity and the development of fundamental movement skills throughout the school week; improvements in nutritional quality of the food supply in schools; environments and cultural practices that support children eating healthier foods and being active throughout each day; support for teachers and other staff to implement health promotion strategies and activities (e.g. professional development, capacity building activities); parent support and home activities that encourage children to be more active, eat more nutritious foods and spend less time in screen based activities. However, study and evaluation designs need to be strengthened, and reporting extended to capture process and implementation factors, outcomes in relation to measures of equity, longer term outcomes, potential harms and costs. Childhood obesity prevention research must now move towards identifying how effective intervention components can be embedded within health, education and care systems and achieve long term sustainable impacts.

There is a global imperative to tackle national and international health inequities- defined as unfair and avoidable differences in health. One step in reaching this goal is to improve the rigorous, scientific evidence base on the impacts of policies on inequities in health outcomes, resource allocation, and use. Systematic reviews are increasingly recognized as a valuable source of evidence for both health care and health systems decision making, yet very few systematic reviews report effects on health equity. We developed consensus-based reporting guidelines for equity-focused systematic reviews in order to help reviewers identify, extract, and synthesise evidence on equity in systematic reviews. Increased use of these reporting guidelines will help improve the reporting of effects on both inequities in health outcomes and health care use across gender, socioeconomic position, and other characteristics, both in systematic reviews and eventually primary research, thus contributing to the global agenda to improve health equity.

Existe un imperativo mundial de abordar las desigualdades sanitarias a nivel nacional e internacional, definidas como diferencias en la salud injustas y evitables. Un paso hacia lograr esta meta es mejorar la base de evidencia científica rigurosa relacionada con las repercusiones de las políticas sobre las desigualdades en los resultados de la salud, la asignación de recursos y su uso. Las revisiones sistemáticas son cada vez más reconocidas como fuente de evidencia valiosa para la toma de decisiones relacionadas con la atención sanitaria y los sistemas sanitarios; sin embargo, muy pocas revisiones sistemáticas informan acerca de los efectos sobre la equidad en salud. Desarrollamos guías consensuadas para la escritura y publicación de revisiones sistemáticas centradas en la equidad, para ayudar a que los revisores identifiquen, extraigan y sinteticen la evidencia sobre la equidad en las revisiones sistemáticas. El uso cada vez mayor de estas guías para escribir y publicar trabajos científicos ayudará a mejorar los informes de los efectos sobre las desigualdades en los resultados de la salud y el uso de la atención sanitaria según el género, la posición socioeconómica y otras características, tanto en las revisiones sistemáticas como, en última instancia, en la investigación primaria, y en consecuencia contribuirá a la agenda mundial para optimizar la equidad en salud.