when dried fruit is available just about anywhere (and by that we mean even the grimiest of gas stations are stocking it these day!).
According to the folks over at Wikipedia
some commercially available dried fruit products are fist treated with sulfur dioxide to enhance the color of the product after drying.
the problem? Sulfur dioxide can trigger asthma symptoms in those with the disorder.
you can avoid purchasing sulfur dioxide-treated fruit by always opting for organic dried fruit products.