San Francisco has filed a lawsuit against several major food manufacturers, alleging that decades of marketing and producing ultra-processed foods have contributed to widespread public health harms. The suit targets Kraft Heinz, Mondelez International, Post Holdings, Coca-Cola, PepsiCo, General Mills, Nestlé USA, Kellogg, Mars Inc. and ConAgra Brands, claiming the companies engineered products using industrial processing methods, additives, and flavor systems designed to drive overconsumption despite known health risks.

Ultra-processed foods—defined by extensive modification, additive use and manufacturing techniques such as extrusion and molding—now represent an estimated 70% of the US food supply. Research continues to link high intake to increased risk of obesity, Type 2 diabetes, cardiovascular disease and certain cancers. San Francisco’s filing argues that these products create unique physiological impacts distinct from their fat, sugar, or sodium content alone.

For product developers, the case underscores growing regulatory and public health scrutiny of ultra-processed categories. It reflects heightened attention to formulation practices, ingredient transparency, and the role of processing technologies in consumer perceptions of healthfulness. The filing may signal increased pressure on brands to justify functional roles of additives, pursue cleaner-label alternatives, and evaluate how processing methods align with shifting consumer expectations and potential future policy action.

The case is People of the State of California v. Kraft Heinz Company, Inc., et al., San Francisco Superior Court. The complaint can be found here.