• Mauro Fisberg, Irina Kovalskys, PrevidelliAgatha NogueiraANhttp://orcid.org/0000-0003-0032-4323Faculty of Biological Sciences and Health - University São Judas Tadeu, São Paulo, Brasil., ZimbergIoná ZalcmanIZhttp://orcid.org/0000-0002-3207-0076Department of Psychobiology - Unifesp, São Paulo, Brasil., Ana Paula Wolf Tasca Del'Arco, and FerrariGerson Luis de MoraesGLMhttp://orcid.org/0000-0003-3177-6576Centro de Investigación en Fisiologia del Ejercicio - CIFE, Universidad Mayor, Santiago, Chile and Department of Pediatrics, Unifesp - Federal University of São Paulo, São Paulo, SP, Brasi.
• Pensi Institute - Foundation José Luiz Egydio Setúbal - Sabará Children's Hospital, São Paulo, SP, Brasil and Department of Pediatrics, Unifesp - Federal University of São Paulo, São Paulo, SP, Brasil.
• Rev Assoc Med Bras (1992). 2019 Jun 3; 65 (5): 669-677.

BackgroundEpidemiological studies with dietary variables are complex methodologically, being the researcher responsible for anticipating, controlling, reducing and preventing methodological errors. Obesity accounts for almost one-third of the world's population and has consequences for childhood and adolescence. Multifactorial disorder must be faced in several aspects, being food and physical activity, modifiable risk factors. The EBANS aims to perform a diagnosis of the nutritional status of the Brazilian population from 15 to 65 years old, from all regions, and the parameters associated with obesity, with several possibilities of correlating data.Methodological ProcessPart of the ELANS study (n = 9218), the EBANS (n = 2000) has a weighted sample and data collection that allows: to evaluate the socioeconomic level of the population; perform a diagnosis of nutritional status (through anthropometric variables); to evaluate food intake (R24h and FFQ for beverages); and evaluate physical activity practice (IPAQ-long and accelerometer).Methodological OpportunitiesWith national coverage, EBANS has the potential to compose regional analyzes, portray the current nutritional epidemiological condition, food consumption and physical activity pattern of the Brazilian population, at different life stages, and may have their data analyzed together or stratified, offering useful subsidies for the formulation of public policies.Methodological ChallengesEach methodological step was designed to reduce errors and biases related to methodological challenges.Caae Registration31670314.8.0000.5567.Final ConsiderationsOf great potential for future data analysis, EBANS tries to contribute to the generation of knowledge to foment policies and actions capable of changing the current obesity scenario.

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