Heavy use of antibiotics by livestock producers is largely unregulated by the government, and roughly 80 percent of the antibiotics used in America are given not to sick people, but to

healthy animals, reports the nonpartisan Government Accountability Office. This antibiotic use could eventually have a "dangerous" impact on human health. Here's what you should know:

Even when they're healthy, many American animals being raised for food are routinely fed antibiotics to ward off illness and promote growth.

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