Raw-milk advocates proclaim the safety of unpasteurized version of milk from cows and goats, despite several E. coli outbreaks linked to the beverage. Food safety experts say the only way to ensure safety is to pasteurize milk before it's consumed, while raw proponents say the process kills key nutrients and alters the taste. The century-old debate has heated up in the past half decade, as more consumers are opting for raw, Scientific American reports.

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