RESUMEN
Obesity is a social and health problem of global dimensions that demands coordinated solutions from different sectors as well as intersectoral efforts to overcome it. However, policies to overcome obesity affect the interests of the commercial private sector. In Brazil, the Intersectoral Strategy for Obesity Prevention and Control (EIPCO) is the result of participative public action and integrates a set of policies in the field of food and nutrition security. Based on the premise that EIPCO expresses public interests to be protected, promoted and guaranteed by the federal government, this article aims to analyze corporate political activity (CPA) and conflict of interest (COI) situations involving the private commercial sector in the food and nutrition field in Brazil, using EIPCO as a reference. The methods include document analysis and identification of cases reported by the Brazilian civil society organizations that are part of the National Council on Food and Nutrition Security. The results highlighted the actors, actions, ideas and interests addressed by EIPCO and also indicated that EIPCO does not question the private commercial sector's practices in regard to obesity and some of its recommended actions reflect disputes about the concept of healthy eating. All cases analyzed involved CPA to promote ultra-processed food consumption, including lobbying and funding researchers. Those practices and goals are in the opposite direction from the objectives of EIPCO to overcome obesity which indicates potential COI once these representatives of the private sector are directly influencing the governmental political process and policies.