The lead review “Risk assessment of genetically modified crops for nutrition and health” by Magaña-Gómez and Calderon de la Barca,1 ends with a common plea: “more research is needed”. It is valid to put both this plea and the justification for other similar research into perspective. How selective are the reviews that lead to the conclusion that more of such research is needed? What comparators are available? Why genetically modified (GM) crops particularly? And what political effect does the science promulgate; to what advantage and to what disadvantage is global society affected?

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Magaña-Gómez and Calderon de la Barca1 conclude that at a macroscopic, whole animal level, there is no provable adverse health effect of GM crops, but there is evidence that microscopic and molecular changes may have been induced in animal studies. It is implied that these may be important for safety....

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