GMO risk assessment is based on very little scientific evidence in the sense that the testing methods recommended are not adequate to ensure safety. Deficiencies have been revealed numerous times with regards to testing GM foods.
The first guidelines were originally designed to regulate the introduction of GM microbes and plants into the environment with no attention being paid to food safety concerns. However, they have been widely cited as adding authoritative scientific support to food safety assessment. Additionally, the Statement of Policy released by the Food and Drug Administration of the United States, presumptively recognizing the GM foods as GRAS (generally recognized as safe), was prepared while there were critical guidelines prepared by the International Life Sciences Institute Europe and FAO/WHO recommend that safety evaluation should be based on the concept of substantial equivalence, considering parameters such as molecular characterization, phenotypic characteristics, key nutrients, toxicants and allergens. Since 2003, official standards for food safety assessment have been published by the Codex Alimentarius Commission of FAO/WHO. Published reviews with around 25 peer-reviewed studies have found that despite the guidelines, the risk assessment of GM foods has not followed a defined prototype. The paper was authored by Javier A Magaña-Gómez and Ana M Calderón de la Barca in International Life Sciences Institute 2009
“The risk assessment of genetically modified (GM) crops for human nutrition and health has not been systematic. Evaluations for each GM crop or trait have been conducted using different feeding periods, animal models and parameters. The most common results is that GM and conventional sources include similar nutritional performance and growth in animals. However, adverse microscopic and molecular effects of some GM foods in different organs or tissues have been reported. While there are currently no standardized methods to evaluate the safety of GM foods, attempts towards harmonization are on the way. More scientific effort is necessary in order to build confidence in the evaluation and acceptance of GM foods.”
So, if anybody ever tells you that GMOs are completely safe for consumption, it’s not true. We just don’t know enough about them to make such a definitive statement. A lot of evidence actually points to the contrary.
Growing evidence of harm from GMOs
GM soy and allergic reactions Eliot M. Herman in his journal Genetically modified soybeans and food allergies supports that Allergenic reactions to proteins expressed in GM crops has been one of the prominent concerns among biotechnology critics and a concern of regulatory agencies. Soybeans like many plants have intrinsic allergens that present problems for sensitive people. Current GM crops, including soybean, have not been shown to add any additional allergenic risk beyond the intrinsic risks already present. Biotechnology can be used to characterize and eliminate allergens naturally present in crops. Biotechnology has been used to remove a major allergen in soybean demonstrating that genetic modification can be used to reduce allergenicity of food and feed. This provides a model for further use of GM approaches to eliminate allergens. Here is another journal for the Allergic Risk of Genetically Modified Soybean: Yonsei Med Journal authored by Sang-Ha Kim et al in 2006
In recent years health professionals have become alarmed by the increasing number of bacterial strains that are showing resistance to antibiotics. Bacteria develop resistance to antibiotics by creating antibiotic resistance genes through natural mutation. Biotechnologists use antibiotic resistance genes as selectable markers when inserting new genes into plants. In the early stages of the process scientists do not know if the target plant will incorporate the new gene into its genome. By attaching the desired gene to an antibiotic resistance gene the new GM plant can be tested by growing it in a solution containing the corresponding antibiotic. If the plant survives scientists know that it has taken up the antibiotic resistance gene along with the desired gene. There is concern that bacteria living in the guts of humans and animals could pick up an antibiotic resistance gene from a GM plant before the DNA becomes completely digested (GEO-PIE website).
It is not clear what sort of risk the possibility of conferring antibiotic resistance to bacteria presents. No one has ever observed bacteria incorporating new DNA from the digestive system under controlled laboratory conditions. The two types of antibiotic resistance genes used by biotechnologists are ones that already exist in bacteria in nature so the process would not introduce new antibiotic resistance to bacteria. Never the less it is a concern and the FDA is encouraging biotechnologists to phase out the practice of using antibiotic resistance genes (GEO-PIE website). (For more information about Antibiotic resistance and GMOS read here…. Tore Midtvedt, Editor-in-Chief in the MicrobEcol Health Dis. 2014
GMOs harm the environment
GM crops and their associated herbicides can harm birds, insects, amphibians, marine ecosystems, and soil organisms. They reduce bio-diversity, pollute water resources, and are unsustainable. For example, GM crops are eliminating habitat for monarch butterflies, whose populations are down 50% in the US. Roundup herbicide has been shown to cause birth defects in amphibians, embryonic deaths and endocrine disruptions, and organ damage in animals even at very low doses. GM canola has been found growing wild in North Dakota and California, threatening to pass on its herbicide tolerant genes on to weeds
Whereas sustainable non-GMO agricultural methods used in developing countries have conclusively resulted in yield increases of 79% and higher, GMOs do not, on average, increase yields at all. This was evident in the Union of Concerned Scientists’ 2009 report Failure to Yield―the definitive study to date on GM crops and yield.
The International Assessment of Agricultural Knowledge, Science and Technology for Development (IAASTD) report, authored by more than 400 scientists and backed by 58 governments, stated that GM crop yields were “highly variable” and in some cases, “yields declined.” The report noted, “Assessment of the technology lags behind its development, information is anecdotal and contradictory, and uncertainty about possible benefits and damage is unavoidable.” They determined that the current GMOs have nothing to offer the goals of reducing hunger and poverty, improving nutrition, health and rural livelihoods, and facilitating social and environmental sustainability. On the contrary, GMOs divert money and resources that would otherwise be spent on more safe, reliable, and appropriate technologies. By avoiding GMOs, you contribute to the coming tipping point of consumer rejection, forcing them out of our food supply. Because GMOs give no consumer benefits, if even a small percentage of us start rejecting brands that contain them, GM ingredients will become a marketing liability. Food companies will kick them out. In Europe, for example, the tipping point was achieved in 1999, just after a high profile GMO safety scandal hit the papers and alerted citizens to the potential dangers. In the US, a consumer rebellion against GM bovine growth hormone has also reached a tipping point, kicked the cow drug out of dairy products by Wal-Mart, Starbucks, Dannon, Yoplait, and most of America’s dairies.
You can read about the above in Evaluating the Performance of Genetically Engineered Crops.
The True Purpose of GMOs
Science is not the only grounds on which GMOs should be judged. The commercial purpose of GMOs is not to feed the world or improve farming. Rather, they exist to gain intellectual property (i.e. patent rights) over seeds and plant breeding and to drive agriculture in directions that benefit agribusiness. This drive is occurring at the expense of farmers, consumers and the natural world. US Farmers, for example, have seen seed costs nearly quadruple and seed choices greatly narrow since the introduction of GMOs. The fight over them is thus not of narrow importance. Their use affects us all. Nevertheless, specific scientific concerns are crucial to the debate. I left science in large part because it seemed impossible to do research while also providing the unvarnished public scepticism that I believed the public, as ultimate funder and risk-taker of that science, was entitled to. Criticism of science and technology remains very difficult. Even though many academics benefit from tenure and a large salary, the sceptical process in much of science is largely lacking. This is why risk assessment of GMOs has been short-circuited and public concerns about them are growing. Until the damaged scientific ethos is rectified, the public is correct to doubt that GMOs should ever have been let out of any lab.