Researchers reviewed dozens of papers published over the last 50 years. They say many people buy /*organic*/ simply because of public perception that it's healthier.
Results are published in the American Journal of Clinical Nutrition.
Critics say the study shouldn't be a reason to give up organic altogether. They say organic products have benefits, including a lack of pesticides.
Americans spent $23 billion last year for organic food, a sharp climb in the last two decades.