This review article is a thorough evaluation of major research on this question to date. Crinnion does a great job of bringing out all of the issues of nutrient value as well as reduced pesticides as he looks at a multitude of studies. What he discovers is that it is a more complicated issue that we first suspected. In general, organic foods had fewer pesticides than non-organic and yet because to the widespread use of pesticides on many crops, the organic foods are still exposed through residues. It was discovered that the nutrient content results were mixed. Sometimes the organic foods would be higher and other times there was no appreciable difference. When reviewing the research papers where the organic foods were higher in nutrients, it was discovered that they were planted in soil that had been organic for more than ten years. In fact, the correlation of the length of time the soil had been organic and the nutrient value of the food seemed to be consistent.
Dr. Crinnion is a Naturopathic Doctor graduating from Bastyr University. He is a professor and chair of the Environmental Medicine Program at Southwest College of Naturopathic Medicine. He is also a contributing editor to Alternative Medicine Review.
Organic Foods Contain Higher Levels of Certain Nutrients, Lower Levels of Pesticides, and May Provide Health Benefits for the Consumer (Crinnion, 2010)