San Francisco is suing makers of the ultra-processed food that health experts say has led millions of Americans into obesity during decades of over-consumption, the city said Tuesday.

In what officials said was a first-of-a-kind lawsuit, the liberal California city is taking to task some of the largest names in groceries, including Kraft Heinz, Coca-Cola, Nestle and Kellogg.

"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."

Ultra-processed food, including candies, chips, sodas and breakfast cereals, are typically made from ingredients that have been broken down, chemically modified and combined with artificia

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