Subway is fortifying its bread with vitamin D and calcium as competition in the better-for-you quick-service market heats up. The nutrients are being added to all of the breads sold at the Milford, Conn.-based sandwich chain’s more than 24,000 U.S. locations, except for English muffins and flatbread. The bread in a six-inch sub now has 30 percent of the U.S. recommended daily intake of calcium and 20 percent of the recommended intake of vitamin D — roughly the same as a glass of ...

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