The city of San Francisco filed the nation's first government lawsuit against some of the largest manufacturers of ultra-processed foods on Tuesday, asserting that the 10 corporations knew the products were harming Americans' health but continued to market them anyway. The corporations include cereal giants Kellogg, Post Holdings and General Mills, candy makers Nestlé USA and Mars Incorporated, the soda companies behind Coca-Cola and PepsiCo, as well as Kraft Heinz Company, ConAgra Brands and Mondelz International. The suit argues that the health care costs of treating related health conditions tied to consuming ultra-processed foods " upwards of $100 billion a year " have fallen on Americans, cities and states. "These companies created a public health crisis with the engineering and marketing of ultra-processed foods," San Francisco City Attorney David Chiu said. "They took food and made it unrecognizable and harmful to the human body." "We must be clear that this is not about consumers making better choices. Recent surveys show Americans want to avoid ultra-processed foods, but we are inundated by them. These companies engineered a public health crisis, they profited handsomely, and now they need to take responsibility for the harm they have caused," he added. Some 70 percent of the U.S. food supply is ultra-processed, according to the U.S. Food and Drug Administration.