Chile's black warning octagons on packaged food became a global reference point for nutrition policy, and a study from CIAPEC, the food environments research centre at the Universidad de Chile's INTA institute, now quantifies how deeply the law reshaped what sits on supermarket shelves. Led by Natalia Rebolledo with corresponding author Camila Corvalán, and published in BMC Medicine, the analysis tracked best-selling products covering more than 95 per cent of market share in their categories in Santiago supermarkets.
Comparing the period before the law with 2017, 2019 and 2020, and applying the strictest final-phase limits throughout, the researchers found the share of products qualifying as high in critical nutrients fell from 70.8 per cent to 52.5 per cent. Sugar dropped most dramatically in sweet spreads, down 44.3 percentage points, and breakfast cereals, down 40.4. Sodium fell furthest in baked goods, down 40.4 points. Saturated fat and energy changed less consistently across categories.
The pattern matters for policy design. Industry did not reformulate once and stop; it kept adjusting recipes to meet the tightening 2019 and 2020 thresholds, which suggests staged regulation sustains pressure rather than producing a single compliance scramble. As governments from Latin America to Europe weigh front-of-pack warning systems, the Chilean evidence base assembled by the INTA group remains the most complete natural experiment available.