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8th November 2017
01:26pm GMT
Not so great for vegetarians, however it wasn't changed because of that - instead, it was all down to one man.
Phil Sokolof argued that the beef tallow recipe was the reason he had a heart attack in 1966, aged 43, and in the years following, poured millions of dollars into campaigning for the recipe to be changed.
He claimed that McDonald's poisoned America, and even though Maccy D's denied it, it changed the recipe to vegetable oil because of the backlash.
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