March 10 (Reuters) - U.S. Secretary of Health and Human Services Robert Kennedy Jr. directed the Food and Drug Administration on Monday to revise safety rules to help eliminate a provision that allows companies to self-affirm that food ingredients are safe. SNIP"For far too long, ingredient manufacturers and sponsors have exploited a loophole that has allowed new ingredients and chemicals, often with unknown safety data, to be introduced into the U.S. food supply without notification to the FDA or the public," he said in a statement.Currently, the FDA strongly encourages manufacturers to submit notices under a rule known as Substances...