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Background:: Schools have become a key figure for the promotion of health and obesity interventions, bringing the development of critical awareness to the construction and promotion of a healthy diet, physical activity, and the monitoring of the nutritional status in childhood and adolescence., Objectives:: To describe a study protocol to evaluate the effectiveness of an intervention designed to improve knowledge of food choices in the school environment., Methods:: This is a cluster-randomized, parallel, two-arm study conducted in public elementary and middle schools in Brazil. Participants will be children and adolescents between the ages of 5 and 15 years, from both genders. The interventions will be focusing on changes in lifestyle, physical activities and nutritional education. Intervention activities will occur monthly in the school's multimedia room or sports court. The control group arm will receive usual recommendations by the school. The primary outcome variable will be anthropometric measures, such as body mass index percentiles and levels of physical activity by the International Physical Activity Questionnaire., Results:: We expect that after the study children will increase the ingestion of fresh food, reduce excessive consumption of sugary and processed foods, and reduce the hours of sedentary activities., Conclusion:: The purpose of starting the dietary intervention at this stage of life is to develop a knowledge that will enable for healthy choices, providing opportunities for a better future for this population., Fundamento:: As escolas tornaram-se essenciais para a promoção de saúde e de intervenções para obesidade, propiciando o desenvolvimento de consciência crítica para a construção e promoção de dieta saudável, atividade física e monitoramento do status nutricional na infância e adolescência., Objetivos:: Descrever um protocolo de estudo para avaliar a eficiência de uma intervenção projetada para aprimorar o conhecimento sobre escolhas alimentares no ambiente escolar., Métodos:: Estudo clínico randomizado em cluster, paralelo, de dois braços, conduzido em escolas públicas de ensino fundamental e médio no Brasil. Os participantes serão crianças e adolescentes entre 5 e 15 anos de idade, dos dois sexos. As intervenções se concentrarão em mudanças de estilo de vida, atividade física e educação nutricional. As atividades de intervenção ocorrerão mensalmente na sala de multimídia ou quadra de esportes das escolas. O grupo controle receberá as recomendações usuais através da escola. O desfecho primário será a mudança nas medidas antropométricas, como índice de massa corporal e os níveis de atividade física conforme o Questionário Internacional de Atividade Física., Resultados:: Esperamos que, após o estudo, as crianças aumentem o consumo de alimentos frescos, reduzam o consumo excessivo de alimentos açucarados e processados, e reduzam as horas gastas em atividades sedentárias., Conclusão:: O propósito de iniciar a intervenção dietética nessa fase da vida é desenvolver o conhecimento que permitirá escolhas saudáveis, propiciando oportunidades para um melhor futuro para essa população.

Introduction: To assess dietary habits, nutritional status and food frequency in children and adolescents with Down syndrome (DS) and congenital heart disease (CHD). Additionally, we attempted to compare body mass index (BMI) classifications according to the World Health Organization (WHO) curves and curves developed for individuals with DS., Method: Cross-sectional study including individuals with DS and CHD treated at a referral center for cardiology, aged 2 to 18 years. Weight, height, BMI, total energy and food frequency were measured. Nutritional status was assessed using BMI for age and gender, using curves for evaluation of patients with DS and those set by the WHO., Results: 68 subjects with DS and CHD were evaluated. Atrioventricular septal defect (AVSD) was the most common heart disease (52.9%). There were differences in BMI classification between the curves proposed for patients with DS and those proposed by the WHO. There was an association between consumption of vitamin E and polyunsaturated fatty acids., Conclusion: Results showed that individuals with DS are mostly considered normal weight for age, when evaluated using specific curves for DS. Reviews on specific curves for DS would be the recommended practice for health professionals so as to avoid precipitated diagnosis of overweight and/or obesity in this population.