The sign also claims that studies have shown a link between cow's milk and autism. The group cites two European studies that link autism to milk consumption and show a link between dairy-free diets and improved autism symptoms.
PETA says it chose to put the billboard by Newark's Prudential Center because a study by the Centers for Disease Control and Prevention says the city's metropolitan area has one of the highest rates of autism in the country.
The CDC says they have not conducted any studies examining autism and milk.
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