By Brendan Pierson

Dec 10 (Reuters) - Major food companies, including Kraft Heinz KHC.O, Mondelez MDLZ.O and Coca-Cola KO.N, were hit with a new lawsuit in the U.S. on Tuesday accusing them of designing and marketing "ultra-processed" foods to be addictive to children, causing chronic disease.

The lawsuit was filed in the Philadelphia Court of Common Pleas by Bryce Martinez, a Pennsylvania resident who alleges he developed type 2 diabetes and non-alcoholic fatty liver disease, diagnosed at age 16, as a result of consuming the companies' products.

His lawyers at the firm Morgan & Morgan, a major U.S. plaintiffs' firm, described the case as the first of its kind.

The other companies being sued are Post Holdings POST.N, PepsiCo PEP.O, General Mills GIS.N, Nestle's NESN.S U.S. arm, WK Kellogg KLG.N, Mars, Kellanova K.N and Conagra CAG.N. The defendants did not immediately respond to requests for comment.

Evidence has grown in recent years that highly processed foods are linked to a wide range of chronic health problems. Food considered "ultra-processed" includes many packaged snack foods, sweets and soft drinks that use substances extracted from foods or synthesized artificially.

Current U.S. Food and Drug Administration Robert Califf has said that ultra-processed foods are likely addictive. Robert F. Kennedy Jr., president-elect Donald Trump's pick to lead the U.S. Department of Health and Human Services, has criticized the food industry and the FDA for failing to regulate it.

Martinez's lawsuit alleges the food companies have long known their products are harmful and deliberately engineered them to be as addictive as possible. It argued that they are drawing from the same "cigarette playbook" as tobacco giants Philip Morris and R.J. Reynolds, which for a time owned the companies that became Kraft Heinz and Mondelez.

The lawsuit includes claims for conspiracy, negligence, fraudulent misrepresentation and unfair business practices. It seeks an unspecified amount of compensatory and punitive damages.

(Reporting By Brendan Pierson in New York, Editing by Alexia Garamfalvi and Aurora Ellis)

((Brendan.Pierson@thomsonreuters.com; 332-219-1345 (desk); 646-306-0235 (cell);))