Brazilian front-of-package nutrition labeling: consumer perceptions on social media platform X

The implementation of FOPNL in Brazil was accompanied by increasing public engagement over time. It was possible to understand consumers' positions and sentiments related to FOPNL through the posts analysis on social media platform X, ranging from positive to negative. These findings highlight the importance of monitoring not only regulatory compliance but also public attitudes toward health policies, as a strategy to inform policy refinement, strengthen public trust, and enhance the impact of nutrition labeling initiatives.