Last week it was all over the news that organic milk is nutritionally superior to conventional milk. Don’t you just hate that non-organic is commonly known as “conventional”? When did the use of pesticides, herbicides, insecticides, and genetic modification become conventional anyway? I really think that we should have a more nefarious name for it. Anyway… I digress. The purpose of this post is not actually to bash non-organic farming. Nope, not today. Today I want to rant about this study.
First off, who sponsored the research? Oh, just CROPP, only the “nation’s largest and most successful organic farmer cooperative” according to their website. Oh sure, they had no influence over the design and results of the study but do you think it would have been published if it hadn’t found that organic milk was superior to non-organic milk? This is not unbiased research.
And let’s just talk about the finding that organic milk is much better for you than non-organic milk. The newspapers were reporting that organic milk contains significantly more omega-3 fatty acids, and significantly fewer omega-6 fatty acids, than non-organic milk. So, we should all drink more full-fat organic milk to obtain our omega-3s. Now, scientific significance is a funny thing. In this case it showed that there was a bit more than twice as much omega-3 in the organic milk, and about 1/4 as much omega-6. Wow! That’s a HUGE difference! Is it though? When we’re comparing 0.0321 g of omega-3 in organic milk and 0.0198 g in non-organic milk (per 100 g). No, no it’s not. And when we read the small print at the bottom of the graph stating that the results were biased because unreported small values were entered as zero this could make for a comparatively large margin of error. Especially when the researchers reported that they obtained more samples of organic milk than non-organic. This could quite easily have skewed the results to make the values appear lower in the non-organic than in the organic.
As the researchers point out, there was a great deal of seasonal variability in the fat-profile of the organic milk. This indicated that the increased omega-3, and decreased omega-6, was more likely a result of consumption of a grass and forage based diet rather than a grain-based diet. Basically, the miniscule benefit from consuming organic milk is a result of the diet composition, not the fact that it was organic.
I’m a big supporter of organic food and products. However, from a nutritional standpoint, there is little reason to choose organic milk over non-organic. There may, however, be some reason to choose grass-fed dairy products over grain-fed dairy.