Generally, to grow food organically, you have to do just two things: Don't use chemical fertilizers, and don't use pesticides. You may be depleting the soil just as fast as a chemical farmer would. Consequently, the food may not always be very nutritious. After all, if you're not building nutrients in the soil, they won't be in your crops.
Organic food, in some instances, may even be toxic. An organic farmer may add a beneficial amendment like manure. But if that manure isn't fully composted, it can contain excessive nitrates—in a form that's easily picked up by a leaf crop like lettuce. So some organic lettuce could possibly give you nitrate poisoning.
http://www.motherearthnews.com/homesteading-and-livestock/john-jeavons-biointensive-agriculture-zmaz90jfzshe
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