Chile’s Food Warning Labels Are Starting to Lower Childhood Obesity
Walk into a Chilean supermarket and the packaging tells on itself. A black octagon shaped like a stop sign sits on the front of the cereal box, the soda bottle, the bag of cookies: ALTO EN AZÚCARES, high in sugar, or salt, or saturated fat, or calories. Chile put those warnings there on purpose, and researchers are now measuring the result on the growth charts of young children.
In 2016 Chile passed the Law of Food Labeling and Advertising, among the strictest food rules anywhere. Products high in sugar, salt, saturated fat, or calories have to carry the black “high in” octagons on the front of the package. Those same products cannot be marketed to children under 14, which means no cartoon mascots, no toys in the box, and no television ads between 6 a.m. and 10 p.m. They cannot be sold in schools either. Chile raised its tax on sugary drinks on top of all that.
The open question was always whether rules about labels and advertising would ever show up in actual health. An answer arrived in June 2026, when researchers reported in The Lancet that they had followed a cohort of Chilean children through the change. Within 18 months of the law taking effect, girls aged four to six were 2.9% less likely to be overweight or have obesity, and boys were 2.4% less likely. A plausible causal signal turned up even earlier, by six months, at 1.9% for girls and 2.2% for boys. The shifts are early and modest, and they land on the age group whose eating habits are still taking shape.
The path from a label to a waistline runs through the shopping cart. An earlier before-and-after study in PLOS Medicine found that once the law was in force, purchases of “high in” sugar-sweetened beverages fell 23.7%, roughly 22.8 milliliters per person per day. People bought less of the drinks the octagons flagged.
Companies moved too. Rather than watch a black warning go on a well-loved product, many manufacturers reworked the recipe to drop below the thresholds. An analysis from the FAO and the University of Chile’s INTA institute found about 15% of products were reformulated, with meat and cereal products among the clearest gains. The label was built to be avoidable, and avoiding it put less sugar and salt on the shelf.
None of this means Chile has beaten obesity. Adult obesity there stays very high and has kept climbing since the reform, a reminder that a policy aimed at children and shopping habits cannot unwind a problem decades in the making. Researchers also point out that the full health return on a better diet plays out over 25 to 30 years, so a dip in overweight among four-to-six-year-olds is an early reading rather than a finish line.
A measured effect on children’s weight is new. For years, the most researchers could say about front-of-package warnings was that they probably changed what people bought. Chile now has a group of young children less likely, by the study’s numbers, to be overweight, tracked to a law printed on every package. That is evidence the countries weighing similar labels did not have before.
