Organically grown food is not any more healthful than the conventionally produced variety, a major review of the literature says.Yet people are willing to  pay higher prices because of organic food’s perceived nutritional benefits. The market for organic food world-wide was estimated to be worth $47 billion in 2007. The study by researchers from the London School of Hygiene and Tropical Medicine reviewed 162 scientific articles from a pool of 50,000 over the past 50 years. Researchers say “there were no significant differences between production methods in nutrient content” in 10 of the 13 categories they looked at. The differences detected were likely to be due to fertilizer use and ripeness at harvest, the study says. The review concentrated on nutrients only, not on contaminants or chemical residues in food from the different production methods. American Journal of Clinical Nutrition

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