Several Democratic members of Congress called on the U.S. health secretary to immediately ban the use of carbon monoxide to preserve the bright red color of fresh meat until the practice is proven safe, according to a letter made public on Monday. The members of the House of Representatives urged Health and Human Services Secretary Mike Leavitt to order the U.S. Food and Drug Administration to repeal its earlier decision that the practice is generally safe. Leavitt should at least order an aggressive nationwide campaign to inform consumers about the practice and caution them against relying on color rather than...