Because drying the fruit reduces water, it greatly concentrates the minerals (iron, copper, and potassium), beta carotene, and fiber. But it also concentrates the sugar and thus the calories; the sugar, combined with the sticky texture, makes dried fruit bad for teeth. In addition, the drying destroys most of the vitamin C and any heat-sensitive phytochemicals. About 1% of Americans, primarily asthmatics, are sensitive to the sulfites that are often added to dried fruits to preserve their color.