The Benefit of Organic Foods

I've been hearing that organically grown food isn't just good for the enviroment, it also provides us with better nutrition than conventionally grown-foods. I've always assumed that the quality of organic foods is a result of the nourished soil - that organically enhanced soil produces plants that are more robust, but I read in the January issue of Prevention magazine that there is another theory:

"Raising produce as nature intended seems to preserve its beneficial nutrients, at least for tomatoes and broccoli, University of California, Davis, researchers found. Among supermarket samples of those two vegetables, organic versions tested higher in vitamin C and heart-protective flavonoids -- compounds plants release to defend themselves against infections and insects. Growing plants using modern industrial-style farming methods, however, seems to eliminate their need for those defense mechanisms, reducing their flavonoid levels."