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At a news conference in Johannesburg, Jay Naidoo, chairman of the Global Alliance for Improved Nutrition, a nonprofit group based in Geneva, proposed that the staples of poor families' diets, such as corn or wheat flour, be routinely fortified with vitamins to improve nutrition ¡ª just as salt is iodized to limit iodine deficiencies.

"The most cost-effective intervention is to fortify the basic foods that people consume," Mr. Naidoo said.