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4 Potential Health Risks of Eating GMO Foods

4 Potential Health Risks of Eating GMO Foods

Genetically modified organisms, or GMOs, are any living thing that has had its genetic material altered in some way through human scientific interference. This does not refer to “selective breeding,” such as when certain crops are selectively bred by gardeners over time to withstand heat, for instance, or the process by which different dog breeds were developed over time. Instead, GMOs undergo a form of gene therapy under lab conditions whereby segments of DNA are spliced, rearranged or removed altogether. You may have been eating genetically modified food for years and not even know it.

In the United States, much of the corn and soybeans produced (especially those to be fed to livestock or to provide filler material in processed foods at the supermarket) contain some portion of genetically modified material. From cereal and crackers to baking mixes, veggie burgers, and even milk and cheese, GMOs have infiltrated our grocery aisles largely without much study into their long-term health effects on our bodies. However, The Environmental Working Group conservatively estimates that each American consumes about 190 pounds of GM foods every year despite this lack of research. Choosy consumers are worried — and getting mad and organized — about these potential health impacts:

1. Allergies

Perhaps the number one health concern over GM technology is its capacity to create new allergens in our food supply. Allergic reactions typically are brought on by proteins. Nearly every transfer of genetic material from one host into a new one results in the creation of novel proteins. Genetic engineering can increase the levels of a naturally occurring allergen already present in a food or insert allergenic properties into a food that did not previously contain them. It can also result in brand new allergens we’ve never before known.

2. Antibiotic Resistance

Genetic engineers rely heavily on antibiotics to guide experiments. It works like this: Not all host cells will take up foreign genes, so engineers attach a trait for a particular type of antibiotic resistance to the gene they introduce into host cells. After they’ve introduced the gene into the cells, they douse all the cells with the antibiotic to see which ones survive. The surviving cells are antibiotic-resistant, and therefore engineers know they have taken up the foreign gene.

Overuse of antibiotics can potentially cause the development of antibiotic-resistant pathogens. Several health organizations, including the World Health Organization and the American Medical Association, have spoken out about the need for the use of these antibiotics to be phased out of the process of making GM foods. Food Patriot Sam Spitz’ harrowing story provides a scary, precautionary warning of how antibiotic-resistant “superbugs” can affect your health.

3. Pesticide Exposure

The majority of GM crops in cultivation are engineered to contain a gene for pesticide resistance. Most are “Roundup Ready,” meaning they can be sprayed with Monsanto’s glyphosate herbicide Roundup without being harmed. The idea is that if the crop itself is immune to Roundup, you can spray it to kill any weeds endangering the plant without worrying about harming your crop. Sound like a good thing? Only if increased human exposure to pesticides is a good thing. Glyphosate has been linked to numerous health problems in animal studies, among them birth defects, reproductive damage, cancer and endocrine disruption.

4. Unpredictability and the Unknown

Foreign genetic material in a host can cause other genetic material in that host to behave erratically. Genes can be suppressed or overexpressed, causing a wide variety of results. One consequence of overexpression, for example, can be cancer. Nutritional problems can also result from the transfer. In one example, cows that ate Roundup Ready soybeans produced milk with more fat in it. In another example, milk from cows injected with a genetically engineered growth hormone was found by a number of researchers, including those published in the journal Lancet, to have substantially higher levels of a compound known as insulin-like growth factor-1, which is linked to human breast, colon and prostate cancers. The milk also has higher levels of bovine growth hormones in it, along with pus and sometimes antibiotics. GM crops have been linked to health problems as diverse as reproductive damage, cancer, Alzheimer’s disease and diabetes. Concerned scientists have been outspoken about these risks.

DNA is complex, and we have yet to understand all the potential complex interactions. The potential hazards are difficult to predict and identify immediately. Additionally, the United States regulatory system is set up to deal with problems occurring with GM foods only after they occur. But what if, instead, we invoked the precautionary principle, an international agreement that calls for intelligent caution when it comes to new science and technologies? Thankfully, you can protect yourself and your family by taking action against GMO foods. Choose organic foods wherever possible (this app can help you determine which foods to avoid), support farms that refuse to grow GMO foods, and pressure your lawmakers to force agriculture companies to label GMOs.  The right to know is one we must be outspoken to protect.

Related Care2 articles:

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Read more: Allergies, Diet & Nutrition, Eating for Health, Food, Health, Health & Safety, , ,

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Shelley Stonebrook

Shelley Stonebrook is an Associate Editor at Mother Earth News—North America’s most popular magazine about sustainable, self-reliant living—where she works on exciting projects such as Organic Gardening content and the Vegetable Garden Planner. Shelley is particularly interested in organic gardening, small-scale, local food production, waste reduction, food preservation and cooking. In her spare time, she posts in her personal blog, The Rowdy Radish.


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1:13AM PST on Feb 3, 2015

Good quality info. Lucky to me I came to your website not on purpose, but now I have bookmarked it.
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9:50AM PDT on Oct 26, 2014

If you found out that your foods have been contaminated, poisoned, made toxic, for the last 20-30 years, would you believe that? Also, that these foods were quietly put on the shelves of all American food stores, without any real notice to the purchasers, to determine for themselves if they wanted to feed such foods to their families and themselves? That is the reality of our food today in America. For those eating them for all these years, plus their children, the damage is done, not reversible. Are you ok with that?? Use your VOTE to make them Stop---it is all we grassroots citizens have left to fight them with. Please educate yourselves and learn all about GMO foods.

5:51AM PDT on Mar 26, 2014

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12:58AM PDT on Oct 20, 2013

thanks for sharing

10:19AM PDT on Aug 7, 2013

Don't think you would ever eat a GMO food? How would you know if they don't label it, and hide it in everything else?

2:43PM PDT on Jul 10, 2013

This is a complete list of GMO foods to AVOID.. please boycott and share this list with everyone you know. lets make a change

4:49AM PDT on Jun 27, 2013

I would never eat GMO foods.

5:08AM PDT on Jun 22, 2013


11:16AM PDT on May 11, 2013

Thank you for explaining these risks so succinctly. It's sometimes hard for me to explain to people why I'm against GMOs. This helps.

6:42AM PDT on May 3, 2013

Here is a complete list of GMO foods commonly found on our grocery shelves. Print it out, share it, and put them back on the shelves. Seek the healthy alternatives that are out there

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