SAN FRANCISCO — The San Francisco city attorney will file on Tuesday the nation’s first government lawsuit against food manufacturers over ultraprocessed fare, arguing that cities and counties have been burdened with the costs of treating diseases that stem from the companies’ products.

David Chiu, the city attorney, told The New York Times that he will sue 10 corporations that make some of the country’s most popular food and drinks. Ultraprocessed products now comprise 70% of the American food supply and fill grocery store shelves with a kaleidoscope of colorful packages.

Think Slim Jim meat sticks and Cool Ranch Doritos. But also aisles of breads, sauces and granola bars marketed as natural or healthy.

It is a rare issue on which the liberal leaders in San Francisco City Hall are full

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