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Americans are among the world's biggest consumers of ultra-processed foods, which comprise more than half of an average adult’s diet and two-thirds of a child’s. As technology continues to accelerate innovations in additives, chemicals and food products, U.S. regulators are struggling to keep up. CBS Reports examines why ultra-processed foods have become so pervasive in the American diet, and what filling the gaps in federal regulation can do to ensure Americans are fed and healthy.