The trace amount is not enough to cause illness, USDA officials said, and is of no special concern.

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Griesing's organization vigorously fought the move to phosphate-free until Washington State passed a law in March 2006 limiting the amount of phosphates in household dishwasher detergent sold in that state to 0.5%, or a trace amount, effective July 1, 2010 (in most of the state).

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"This is very exciting, clearly, because here we have somebody who can have anaphylaxis and deadly reaction from trace amounts, and you're converting this person into somebody who can tolerate a significant amount of the food, " said Dr. Anna Nowak-Wegrzyn, associate professor of pediatrics at Mount Sinai Medical Center in New York.

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By 2008, the city stopped restaurants from using all but trace amounts of transfats, and Mr. Bloomberg recently won some success in convincing global food companies to lower the amount of sodium in prepackaged products.

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