Ultra-Processed Foods (UPF) Litigation Update, 2026

The effort to build tobacco-style litigation around ultra-processed foods hit a wall and opened a new door in the same stretch of 2026. The individual test case that launched the theory was permanently dismissed, a setback that exposes how hard causation is to prove in this area. At almost the same moment, the City of San Francisco brought the first government lawsuit against the industry, shifting the most serious legal threat from injured individuals to public entities borrowing the tobacco and opioid playbook. Here is where the litigation stands at mid-year.

The test case: Martinez is dismissed, permanently

The case that started it all is over. Bryce Martinez, a Pennsylvania man, sued in December 2024 alleging that a lifetime of ultra-processed food consumption gave him type 2 diabetes and non-alcoholic fatty liver disease before he turned 17, naming Kraft Heinz, Coca-Cola, PepsiCo, Nestlé, Mondelez, General Mills, Mars, and other manufacturers. A federal judge in the Eastern District of Pennsylvania dismissed his first complaint in 2025 as deficient, and on June 30, 2026, the court refused to let him try again. As Bloomberg Law reported, the packaged-food makers "permanently shed" the suit when the court dismissed the amended complaint and denied leave to amend a second time.

The reasoning is what matters for everything that follows. According to an analysis by the law firm Morrison Foerster, the plaintiff alleged that he regularly consumed 179 ultra-processed products from 2009 to 2021, but the court held that the complaint still showed only correlation, increased risk, and "biological plausibility" rather than facts proving that any specific product or any specific defendant caused his diseases. As Food Business News noted, the judge acknowledged the complaint "raises serious concerns" about the industry's effect on children while concluding that the law does not allow a plaintiff to hold an entire industry liable in a single suit. That specific-causation gap, connecting a named product from a named company to a named injury, is now the central obstacle for every UPF personal-injury claim.

The government front: San Francisco changes the theory

While the individual theory faltered, a more dangerous one for the industry emerged. On December 2, 2025, San Francisco City Attorney David Chiu filed the first municipal lawsuit in the country targeting ultra-processed foods, suing on behalf of the people of California against ten of the largest manufacturers, including Kraft Heinz, Mondelez, Post Holdings, Coca-Cola, PepsiCo, General Mills, Nestlé USA, Kellogg, Mars, and Conagra. Reuters reported that the suit accuses the companies of using tobacco-industry tactics to design and market products intended to addict consumers, and of violating California's public-nuisance and deceptive-marketing laws.

The change in plaintiff changes the legal math. Rather than proving that UPFs caused one person's illness, San Francisco seeks to recover the public-health costs the city bears for treating diabetes, heart disease, and related conditions, a public-cost-recovery theory modeled directly on the litigation that produced hundreds of billions of dollars in tobacco and opioid settlements, as Food Dive reported when the suit was filed. Notably, San Francisco is represented by Morgan & Morgan, the same firm behind the Martinez case. The case was docketed as People of the State of California v. Kraft Heinz Co., and by early 2026 it had moved into federal court in the Northern District of California.

More individual suits keep coming despite the losses

The Martinez dismissal has not stopped new individual filings. In April 2026, a Wisconsin woman brought a suit, Kreie v. Kraft Heinz, in federal court against the same roster of manufacturers plus Unilever, alleging that her UPF consumption caused type 2 diabetes, as Food Business News reported. A separate consumer action filed in the Eastern District of Wisconsin, which Food Dive covered, seeks $1 billion on the theory that the products are engineered to be addictive. Whether any of these can clear the specific-causation bar that sank Martinez is the open question, and defendants will press the same argument that defeated the test case.

The regulatory backdrop: warnings, bans, and preemption fights

The courtroom fights are unfolding against a fast-moving regulatory backdrop that cuts in several directions. States have begun mandating on-package warnings and banning specific additives, and industry has pushed back hard. As the National Law Review's food-litigation tracker explains, Texas enacted Senate Bill 25 requiring warning labels on foods containing any of 44 specified ingredients, and in December 2025 beverage and food trade associations sued the Texas Attorney General to block it, while West Virginia's color-additive ban has drawn its own challenge. These fights over compelled warnings, federal preemption, and First Amendment limits will shape what manufacturers must disclose, which in turn feeds the "failure to warn" theories at the heart of the UPF suits. The political environment adds fuel: Reuters noted that a May 2025 report from the Trump administration, led by Health Secretary Robert F. Kennedy Jr., pointed to ultra-processed foods as a cause of childhood chronic illness.

The science is suggestive but still contested

Underlying all of it is a scientific record that plaintiffs find compelling and defendants find insufficient for causation. Ultra-processed foods now make up an estimated 70% of the US food supply, and a growing body of epidemiology links high intake to obesity, type 2 diabetes, cardiovascular disease, and certain cancers. But as even plaintiff-side coverage acknowledges, independent experts caution that much of this evidence rests on statistical modeling and observational association, which does not establish that UPFs directly cause any individual's disease. That distinction, powerful population-level correlation versus provable individual causation, is exactly the line the Martinez court drew, and it will define the litigation's trajectory.

What to watch in the second half of 2026

Three things will shape where this goes. First, watch whether the newer individual suits, such as Kreie, are drafted to survive the specific-causation problem that doomed Martinez, or whether they meet the same fate. Second, watch San Francisco's case closely, because a government plaintiff seeking cost recovery sidesteps the individual-causation hurdle and, if it survives early motions, could trigger copycat suits by other cities and states, just as the tobacco and opioid waves did. Third, watch the state-law and preemption battles over warnings and additives, which will determine the disclosure duties that underpin the failure-to-warn claims. The individual-injury theory is on the ropes after Martinez, but the government-recovery theory is just getting started, and 2026 is the year the two diverged.

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