Monthly Archives: September 2012


オーガニックフードの健康への影響についてのシステマティックレビューを Stanford 大の研究チームが Annals of Internal Medicine に2012年9月4日、発表した。

Ann Intern Med. 2012 Sep 4;157(5):348-66.
Are organic foods safer or healthier than conventional alternatives?: a systematic review.
Smith-Spangler C, Brandeau ML, Hunter GE, Bavinger JC, Pearson M, Eschbach PJ, Sundaram V, Liu H, Schirmer P, Stave C, Olkin I, Bravata DM.

Background: The health benefits of organic foods are unclear.
Purpose: To review evidence comparing the health effects of organic and conventional foods.
Conclusion: The published literature lacks strong evidence that organic foods are significantly more nutritious than conventional foods. Consumption of organic foods may reduce exposure to pesticide residues and antibiotic-resistant bacteria.

テーマがキャッチーだからか、 いつもチェックしている The New York Times と National Health Service (England) の両方で即座に取り上げられていたのでメモ。

NHS : Eating organic food ‘won’t make you healthier’

NHS はいつもの通り、研究結果をバイアスなく解説し、論文通りに報道されているか中立的な立場で解説。


  • 研究により「オーガニックフード」の定義が揺れている
  • 人は栄養・健康面以外にも環境目的でオーガニックフードを買っている
  • 長期にわたって健康リスクを調査した研究が存在しない(最長でも2年)


  • fruits and vegetables
  • grains
  • meats and poultry
  • milk
  • eggs


  • processed foods

Main Findings

  • organic produce was 30% less likely to be contaminated with pesticides compared with conventional produce(risk difference 30%, confidence interval [CI] -37% to -23%) but that differences in the risk of exceeding the allowed safety limits were small.
  • only three studies out of the 237 (1.26%) where levels of pesticide contamination found in conventional products exceeded EU maximum safety limits.
  • Of the 17 human studies, only three looked at clinical outcomes.. These studies found no significant differences between those eating organic foods compared with conventional foods.
  • Two studies reported significantly lower urinary pesticide levels among children consuming organic produce but this difference was not observed among adults.


  • studies were limited in number and varied in their quality.
  • high variation in the studies comparing nutrient and contaminant levels in foods.



  • results should be “interpreted with caution” due to the high variation between the included studies.
  • Some of the human studies had very small samples which ranged from six to 6,630 people. In addition, none of these studies ran for longer than two years, which means conclusions about the long-term health benefits of organic foods cannot be drawn.


The researchers do suggest that a more effective method of assessing the relative benefits of “organic verses conventional food” would be to carry out a cohort or randomised controlled study. But these types of studies would be both very time consuming and expensive.


The New York Times : Organic Food vs. Conventional Food

SEPTEMBER 4, 2012, 5:53 PM

The New York Times では研究結果をさらっと解説したあと、効果がなくて高価なオーガニックフードをわざわざなんで買うの?と消費者にコメントを求めている。
それは農家の健康のため、地球のため(持続性)のためがおおい。conventional food サイコーの人は、そもそもオーガニックフードに興味が無いからなのか、せっかくコメントしても評価が低いからなのかしらないが、見当たらなかった。




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