A new study fails to find scientific support for claims organic food is healthier or safer than conventional alternatives and everyone acts as if this is a surprise. It shouldn’t be. Scientific research has fairly consistently failed to validate the claimed superiority of organic food, as I’ve noted in prior posts over the past ten years (see, e.g., here, here, and here). Organic foods do not consistently show higher nutrient levels than conventional foods, nor are there even clear environmental advantages. Organic farming uses less energy and fewer chemicals, but it also tends to be more expensive and requires more land — meaning that a widescale shift to organic production would increase food costs and require putting more acres under plow, with consequent negative effects on species habitat.
For this latest study, published in the Annals of Internal Medicine, Stanford researchers conducted a meta-analysis of over 200 studies looking at the differences between organic and conventional foods, and concluded “the published literature lacks strong evidence that organic foods are significantly more nutritious than conventional foods.” Organic foods tended to have lower pesticide residues and were less likely to have antibiotic-resistant bacteria, but the researchers concluded the differences were not significant enough to have any meaningful health impact. If organic food truly is healthier — and it may be — the existing scientific literature cannot (yet?) support such claims, particularly as applied to organic foods across the board. There may be specific foods, however, for which organic production may make a difference (or for which organic production methods tend to correlate with other practices that produce positive results).
The bottom line is eat organic foods if you like. Just don’t believe there’s any scientific basis for claiming you will be healthier as a result. As the paper’s senior author, Dena Bravata, explains: “There isn’t much difference between organic and conventional foods, if you’re an adult and making a decision based solely on your health.”
For more on the study, here are reports from the NYT, AP, and NPR.
Cross-posted from The Volokh Conspiracy.