QHow can you be sure that GMO foods won't affect human health long-term?

How can you be sure that GMO foods won't affect human health long-term?

AExpert Answer

GM foods have a long, safe track record (17 years in the marketplace). From their introduction in 1996 until now, scientists have found, through repeated and extensive testing, that GM foods are no more risky than comparable non-GM foods, nor do they differ in nutritional value. 


Currently approved GM crops developed through specific genetic additions or subtractions are as safe as conventional and organic crops developed via random genetic shuffling.  Most people do not realize that plant breeders have been randomly altering and admixing plant genomes for centuries.  Techniques using chemicals and radiation to break plant DNA and induce mutations have been used to develop many conventional and organic crops. Whether scientists use traditional approaches or genetic engineering, their goal is to develop crops with new and agriculturally useful traits. Humans have been changing plant genomes for generations – we just have new, more precise tools. 


Regulatory and food-safety focus should be on the resulting trait(s), not on the specific modification or plant breeding process by which the genetic changes were made. Because they have different traits, GM foods are carefully evaluated on a case-by-case basis. For example, Arctic apples are non-browning GM fruits that have been developed by “turning off” a gene, rather than by adding any genes to the apple genome. Whether a trait occurs naturally, is chemically or radiation induced or is purposely incorporated via genetic engineering, inherent risks are the same. 


Given that we’ve been genetically modifying plants for millennia, using one approach or another, we should frame this question in terms of relative risks: How “sure” can we expect to be when it comes to long-term health impacts of GMO foods?  As with most things in life (except death and taxes, as the saying goes), 100 percent certainty is not possible or reasonable to require. However, safe use of GM foods since 1996, coupled with our knowledge of human and plant physiology, points to long-term safe use of genetic engineering as a plant breeding tool set in agriculture.

Posted on January 31, 2018
Thank you for your question. There are various aspects of your question. I assume your question refers to the use of Agrobacterium rhizogenes by scientists to intentionally transfer genes from the bacterium to plants. Infection and DNA transfer from this bacterium occurs in nature all the time to cause disease. Such transformed plants are not classified as GMOs since transfer occurred naturally. If this is done by scientists then it would be classified as a GMO. Rules and... Read More
Posted on March 1, 2018
I’m a Monsanto scientist who has more than 20 years of experience with genetic modification of plants. I will try to answer your question, even though I don’t ever do experiments on animals, certainly not on humans, of course! Can humans be genetically modified…but a much bigger question is should humans be genetically modified? There are two ways to think about genetic modification of humans (or any animal). One way is modification of somatic cells, and the other is the... Read More
Posted on May 10, 2017
The simple answer is that 20+ years of composition assessments of GMO crops have demonstrated that crop composition is not appreciably affected by the GM process (1). In addition, data collected through that time have indicated that general factors such as the growth environment can contribute to notable variation in component levels (2). Plant agglutinins (or lectins) and amylase inhibitors are examples of anti-nutritional compounds that may be present in crops. The relevance of such a... Read More

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