Is the Movement to Label GMOs Anti-Science?

Posted on June 14, 2013 by Carole Bartolotto, MA, RD

by Carole Bartolotto, MA, RD

One of the criticisms I hear about the movement to label genetically modified organisms (GMOs) is that it’s anti-science. Some even go so far as to say it’s an assault on science. While I can’t speak for the entire movement, I can say that the lack of research in humans and troubling findings in some animal studies is enough to make me question the safety and necessity of GMOs.

The research related to GMOs can be hard to sort through. One study may find health problems in animals, but then proponents and biotech scientists say the study is flawed. But are there any scientists that question the safety and effectiveness of GMOs?

Over the past few months, I have spoken with scientist Michael Hansen, PhD, who is an expert on genetically modified crops. Dr. Hansen works for the Consumers Union, the safety and advocacy arm of the organization Consumer Reports. Consumers Union is not funded by agribusiness, or other multinational companies tied to the biotech or food industry. Therefore its opinions are not influenced by industry money.

Dr. Hansen has testified at many hearings in support of GMO labeling both nationally and internationally. And he has been interviewed on a lot of television and radio shows, including the Dr. Oz Show, which aired on March 26, 2013. He is willing to answer some of my questions about GMOs, also know as genetically engineered crops.

1. Does the Food and Drug Administration (FDA) do safety testing on genetically modified crops?

No, they do not. Nor do they require any companies to do safety testing of their genetically engineered (GE) crops. The FDA policy on GE was introduced as a deregulatory initiative in 1993. It is based on the notion that genetic engineering is an extension of traditional plant breeding and should be regulated in the same way. In other words, no requirement for human safety testing; instead there are voluntary safety consultations.

2. What are voluntary safety consultations?

The companies that create GE crops do their own food safety assessments, which the FDA reviews. At the end of the consultation process the FDA sends a letter to the company. Here is an excerpt from one letter which says, “Based on the safety and nutritional assessment you have conducted, it is our understanding that Monsanto has concluded that corn grain and forage derived from the new variety are not materially different in composition, safety, or other relevant parameters from corn grain and forage currently on the market, and that they do not raise issues that would require premarket review or approval by FDA.” [emphasis added]. A version of this sentence is in all 97 “safety” consultation letters.

In other words, the FDA does not state its own opinion about the safety of GE crops. It only states what the company believes.

3. What are the potential health risks associated with Genetically Engineered Crops?

Human safety concerns may arise from genetic engineering due to the introduction of new allergens, an increased level of naturally occurring allergens, plant toxins, or changes in nutrition. GE crops may also have a negative effect on the gut and peripheral immune response. A meta-analysis of animal feeding studies involving GE crops suggests that they cause liver and kidney problems. And a new well-designed, long-term feeding study has found that pigs consuming GE corn and soy had significantly higher rates of severe stomach inflammation and females had significant thickening of the uterus.

In addition, GE plant material is finding its way into the human body with unknown health effects. A study found the toxin from GE corn in 93 percent of maternal and 80 percent of fetal blood samples. Clearly, more research is needed.

4. The Séralini study published in October, 2012, has gotten a lot of criticism. Do you think it has merit?

Yes, I do. The study was a follow-up to Monsanto’s 90-day feeding study on its NK603 corn. The Séralini study, which continued for 2 years, found that female rats fed this GE corn died 2-3 times more quickly, and developed mammary tumors more often than controls that ate non-GE corn. Male rats fed the GE corn had liver and kidney problems at higher rates than controls, and more large tumors than rats fed non-GE corn.

The study received a lot of media attention. It was viciously attacked in the media by pro-GE and industry-affiliated scientists in what appears to have been an orchestrated campaign.

The two main criticisms were that they used too few rats per group and that they used a strain of rat that is prone to mammary tumors as they age. Both criticisms are off base.

The Séralini study used 10 rats per group, the same number of rats that Monsanto used in their 90-day feeding study to look at key biological parameters. If ten rats are too small a sample size to demonstrate health problems, how come ten rats are a sufficient sample size to demonstrate no safety concerns?

As for the type of rat used, Séralini used the same strain, Sprague Dawley (SD), that was used in the Monsanto feeding study on its NK603 GE corn and its 2 year feeding study looking at the safety of glyphosate. Why is use of SD rat’s bad when Séralini uses them, but okay when Monsanto and other biotech companies use them?

If Séralini’s study is flawed, then so is Monsanto’s, and the safety of their GE corn should be reassessed.

5. Have GMOs helped to feed the world, reduce the use of pesticides, or increase yield as proponents have promised?

No. Dr. Charles Benbrook’s work has shown that GE crops in the U.S. have lead to a dramatic expansion in pesticide use, particularly herbicides. Indeed, over the past 16 years there has been an increase of about 404 million pounds more herbicides used on GE crops, compared to non-GE crops. Work by Dr. Doug Gurian-Sherman has shown that genetic engineering doesn’t really increase crop yield.

6. Why do you think foods with GMO ingredients should be labeled?

There are a lot of uncertainties related to genetically engineered crops including potential allergens and unknown health risks. If these foods are not labeled, it will be very difficult to identify an unexpected health effect resulting from eating a genetically modified food. For more information, see here.

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References:

Bernstein, I.L., Bernstein, J.A., Miller, M., Tierzieva, S., Bernstein, D.I., Lummus, Z., Selgrade, M.K., Doerfler, D.L. and V.L. Seligy. 1999. Immune responses in farm workers after exposure to Bacillus thuringiensis pesticides. Environmental Health Perspectives, 107(7): 575-582. At: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1566654/pdf/envhper00512-0103.pdf

Gupta, A. et al. 2006. Impact of Bt cotton on farmers’ health (in Barwani and Dhar District of Madhya Pradesh). At: http://www.lobbywatch.org/archive2.asp?arcid=6265 and http://www.lobbywatch.org/archive2.asp?arcid=6266

Gendel, S.M. 1998. The use of amino acid sequence alignments to assess potential allergenicity of proteins used in genetically modified foods. Advances in Food and Nutrition Research, 42: 44-61.

Vazquez-Padron, R.I., Moreno-Fierros, L., Neri-Bazan, L., de la Riva, G.A. and R. Lopez-Revilla. 1999. Bacillus thuringiensis Cry1Ac protoxin is a potent systemic and mucosal adjuvant. Scandinavian Journal of Immunology 49: 578-584.

Finamore, A., Roselli, M., Britti, S., Monastra, G., Ambra, R., Turrini, A. and E. Mengheri. 2008. Intestinal and peripheral immune response to MON810 maize ingestion in weaning and old mice. Journal of Agriculture and Food Chemistry, 56: 11533-11539. At: http://www.giovannimonastra.info/documenti_pdf/Monastra_J_Agr_Food_Chem_2.pdf

Séralini, G-E, Mesnage, R., Clair, E., Gress, S., de Vendômois, JS and D. Cellier. Genetically modified crops safety assessments: present limits and possible improvements. Environmental Sciences Europe, 23: 10. At: http://www.enveurope.com/content/pdf/2190-4715-23-10.pdf

Kuiper, HA, Kleter, GA, Notebom, HPJM and EJ Kok. 2001. Assessment of food safety issues related to genetically modified foods. The Plant Journal, 27(6): 503-528.

Carmen, JA. et al. 2013. A long-term toxicology study on pigs fed a combined genetically modified (GM) soy and GM maize diet. Journal of Organic Systems, 8(1): 38-54. At: http://www.organic-systems.org/journal/81/8106.pdf

Aris, A and S Leblanc. 2011. Maternal and fetal exposure to pesticides associated to genetically modified foods in Eastern Townships of Quebec, Canada. Reproductive Toxicology, 31(4): 528-533.

Séralini, G-E. et al. 2012. Long term toxicity of a Roundup herbicide and a Roundup-tolerant genetically modified maize. Food and Chemical Toxicology, 50: 4221-4231. http://www.sciencedirect.com/science/article/pii/S0278691512005637

Bardocz S, Clark A, Ewen S, Hansen, M, Heinemann J, Latham J, Pusztai A, Schubert D and A Wilson. 2012. Séralini and science: An open letter. Independent Science News. At: http://independentsciencenews.org/health/seralini-and-science-nk603-rat-study-roundup/

Benbrook, C. 2012. Impact of genetically engineered crops on pesticide use in the U.S. -the first sixteen years. Environmental Sciences Europe, 24:24.

Gurian-Sherman, D. Failure to Yield: Evaluating the Performance of Genetically Engineered Crops. Union of Concerned Scientists, 2009.

Is the Academy of Nutrition and Dietetics Committed to Telling Americans the Truth About What They Are Eating?

Posted on April 17, 2013 by Carole Bartolotto, MA, RD

by Carole Bartolotto, MA, RD

A few days ago, an article appeared in the New York Times entitled, “Food Politics Creates Rift in Panel on Labeling,” by Stephanie Strom. It was about my dismissal from the Academy of Nutrition and Dietetics work group for not disclosing a business that I don’t even have.

The work group was tasked to review the evidence related to food technologies, including genetically modified foods. I was happy to be a part of the group because I have seen how industry uses these position papers to support their stance. Last fall in the state of California, we had a proposition on the ballot that would require the labeling of genetically engineered foods. The state voters’ guide incorrectly said that the Academy of Nutrition and Dietetics had concluded that “biotech foods are safe.” However, the Academy’s position was expired, so they actually had no position. The Academy issued a press release about this, but it was too late. The voter guide was already mailed to over 18 million registered voters. And Prop 37 lost. This is why I wanted to be on the group. I was hoping to prevent this from ever happening again.

Being on the work group was an interesting experience. Right off the bat, I had some major concerns, including the following:

Two members, Jennie Schmidt and Marianne Smith Edge, disclosed their ties to industry groups such as Monsanto.
The evidence review was not going to link to the position paper. And it would only include human studies, not animal. The problem with this is that there are not very many human studies to review.
The position paper was going to be written by Christine M. Bruhn, PhD, from UC Davis, a vocal supporter of genetically modified foods who is against labeling. UC Davis has strong ties to Monsanto.

I mentioned some of my concerns with the group and I also sent an email to an Academy employee involved with the project about the potential conflicts of interest. Because of my concerns, members of the group were asked to fill out the Academy’s disclosure statement again and disclose any money they might have received.

On March 22, 2013, I received a letter saying I was dismissed for not disclosing my consulting business, listed on my blog, healthyeatingrocks.com. I was shocked to say the least, especially since I do not have a business. At some point I would like to pursue one, but I am too busy with my full-time job and family obligations.

I sent the Academy 3 emails explaining that I do not have a business, that I did have questions, and would like to talk. Since the dismissal letter specifically stated, “Please contact us if you have any questions,” I was expecting a response back. I waited for over 3 weeks, but I heard nothing

And that is why I decided to talk to the New York Times.

Then the Academy posted a statement that was filled with inaccuracies.

I did not refuse to “disclose any and all conflicts of interest.” Why would I disclose something that does not exist? I did disclose however, that I received $135.00 from two sources that were relevant to the project, as they required.

The Academy also says that “She was simply asked, repeatedly, to disclose this information and she declined to do so.” However, it was my questioning of the group’s policy to include people on the committee with ties to industry that led to the Academy’s request for more information from the entire group, not only me. And I complied with their request.

It was clear their minds were made up. A nonexistent business, not disclosed, was a bigger concern than two people who are involved with industries that would directly benefit from an evidence review and position paper with a positive slant toward genetically modified foods.

All of this posturing takes away from the real issue: Is it appropriate to have people involved with the biotech industry, which could benefit from the outcome, sit on a biotech-related work group? I don’t think so. Additionally, I found it alarming that the Academy was intent on moving forward with a position paper, written by Christine M. Bruhn, PhD, to be published before the evidence review was complete. She wrote the Academy’s 2006 position paper, which said that GMOs “…enhance the quality, safety, nutritional value, and variety of food available for human consumption and increase the efficacy of food production, processing, food distribution, and environmental and waste management.” I am guessing her 2013 version will offer up more of the same.

Sadly, it is the American people who are the losers in this situation because they will probably not get clear, unbiased, and balanced information about what to eat from the organization that represents the largest group of nutrition-related health professionals in the country.

Considering that we have no long-term evidence showing that genetically modified foods are safe for humans, the most responsible position the Academy could take would be to say, “The long-term health effects of genetically modified foods are unknown. Until and unless we know more, at minimum, they should be labeled.”

Is the Academy of Nutrition and Dietetics committed to telling Americans the truth about what they are eating? I, for one, am not convinced. What do you think?

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Thanks to all the people who have supported me. Your kind works and notes of encouragement have meant so much to me. Someone even started a petition to get me reinstated to the work group!

How to Avoid Genetically Modified Foods

Posted on November 10, 2012 by Carole Bartolotto, MA, RD

Depending on who you talk to, genetically engineered foods, also know as genetically modified foods (GMOs) are either Frankenfoods or the solution to world hunger; untested and unsafe or substantially equivalent to non-GMO crops. The truth lies buried under all the dogma but here are some sobering facts.

We eat on average 193 pounds of genetically modified foods in a year, at minimum. Yes you read that right—193 pounds!
There are no long-term safety studies in humans and none are in the works.
Genetically modified crops use more pesticides. Their use has increased by 404 million pounds from 1996 to 2011. And stronger herbicides are needed to counter resistance, including 2,4-D, which is one of the chemicals found in Agent Orange! This is bad for the environment and can’t be good for us.
Chemical companies that create GMO seeds, patent them so farmers have to buy new seeds each year. I just don’t think it is right to patent seeds, GMO or otherwise.
Some of these companies, such as Monsanto, participate in unethical business practices including suing farmers for patent infringement when their non-GMO crops become contaminated with GMOs. See here for more info. Do we really want chemical companies to control our food supply?

It is for these reasons that I avoid genetically modified foods. I hope you consider removing them from your diet as well.

The current crops that are GMO are soy, corn, canola, sugar beets, cotton, zucchini, yellow crook neck squash, and alfalfa (which is fed to cattle and not us). Here are some tips to help you cut out the bulk of GMOs from your diet.

Buy USDA Organic, which is grown from seeds that are not genetically modified.
Look for the Non GMO Project Verified label. Foods with this label are free of GMOs.
Buy brands that do not contain GMOs. All Trader Joe’s labeled foods, Whole Foods 365 Daily Value, and Follow Your Heart labeled foods are sourced to be free of GMOs.
Since most corn and soy are GMO, choose organic when you eat these foods. This includes sweet corn, corn tortillas, corn oil, corn chips, tofu, edamame, soy milk, and baby formula. You can also buy these foods if they have the Trader Joe’s or 365 Daily Value labels.
Oil is a major source of GMOs. Choose extra virgin olive oil or organic canola oil (cold pressed), or Trader Joe’s brand canola oil instead of corn, soy, cottonseed, or other oils.
Sugar and high fructose corn syrup are another source of GMOs. Cane sugar is not genetically engineered so when you do have sugar, choose cane. However, sugar is not good for us anyway, so it would be best to cut it out as much as you can.
Yellow crook neck squash, zucchini, and Hawaiian papaya are all genetically modified. Buy these foods organic. All Trader Joe’s produce is sourced to be free of GMOs so you can also buy these veggies there. You will notice that Trader Joe’s sells Caribbean papaya and not Hawaiian, which is one of the ways they avoid GMOs.
If you love processed foods, such as canned and packaged products, either buy organic or purchase Trader Joe’s labeled foods, 365 Daily Value, or Follow Your Heart brands.
There are a lot of invisible GMO ingredients in processed food. To learn more about them, see here.
Do you eat out a lot?
- Ask your favorite restaurants if their menu items contain GMO ingredients. This will help increase their awareness and perhaps move them in the direction of removing GMOs from their menu.
- If they don’t know, ask if they use organic foods. If they don’t use organic products, avoid tofu, corn, corn tortillas, corn chips, edamame and other foods from corn and soy. Also avoid sugar and desserts.
- Ask what kind of oil they use. If it is soy, canola, or cottonseed, they are most likely GMO.
- Avoid fried foods or ask them to use olive oil when grilling or frying.
- Safe options are salad but ask for the cruets with olive oil (not an olive oil blend) and vinegar instead of other salad dressings.
- Also ask what the chef prepares fresh and then request it to be made with olive oil or no oil.
- The great news is that some restaurants have made the effort to avoid GMOs in the Los Angeles area such as Real Food Daily and Hugo’s. Some are in the process of removing them, such as Follow Your Heart Restaurant. The more you ask, the more likely restaurants in your area will remove them as well.
What else can you do? Request that restaurants and fast food establishments you go to use non-GMO ingredients. Sharkey’s says their corn chips are made with non-GMO corn and that is a good thing. But they are fried in genetically modified canola oil. Tell Sharkey’s, restaurants, fast food chains, and grocery stores, you want products without GMOs. They will respond to customer demand, as they have done in the past. Remember what happened when we found out there was “pink slime” in our hamburgers?

For more information, check out the non-GMO shopping guide here.

The Truth About Proposition 37—Labeling Genetically Engineered Foods

Posted on October 24, 2012 by Carole Bartolotto, MA, RD

I knew the battle over prop 37 would be heated, tough, and ugly. But I was not expecting biotech companies and food manufacturers to stoop as low as they have and spend a million dollars a day doing so. We’ve all heard the saying, “money talks.” In the case against prop 37, money not only talks, it also lies. Here is the truth about the false claims and inaccuracies surrounding prop 37.

Claim: It will increase the cost of food by “$400 dollars per year for a typical family.”

The truth is we will probably see no change in the cost of food just as they saw no increase in the cost of food in the European Union (EU) when they labeled genetically engineered foods. David Byrne, the former commissioner for health and consumer protection for the EU, said that labeling genetically engineered foods in Europe “did not result in increased costs, despite the horrifying (double-digit) prediction of some interests.” Additionally, when food manufacturers in the U.S. were forced to label trans fats in 2008, we saw no increase in food costs. Thus, there is no reason why we would have an increase in food costs from labeling genetically engineered foods under this proposition. For more information, see here.

Claim: It is “full of special interest loopholes and exemptions.”

Prop. 37 is simple, it labels genetically engineered foods that are sold in the grocery stores. California law only allows one issue to be addressed by ballot propositions so the food in grocery stores was chosen since it is what people eat the most. Prop 37 only covers foods that are genetically engineered and not animals that eat genetically engineered foods. This explains why dog food would have a label, since it is made with genetically engineered corn, but beef would not since it is not genetically engineered. It is the same issue with soy milk, which would be labeled because soy is genetically engineered, but milk is not. For more information, see here.

Additionally, Dr. Henry I. Miller, who is featured in the commercial about exemptions, does not work at Stanford University. Rather, he is a fellow at the Hoover Institution, which sits on the Stanford campus, but is not a part of the university. Dr. Miller is a long-time front man for big tobacco and big oil, has called for the reintroduction of DDT, and even stated that the people around the Fukushima nuclear power plant disaster “may have benefited from it.” The bottom line is he has zero credibility.

Claim: Prop 37 authorizes “shakedown lawsuits.”

Actually, it was written to provide no economic incentives for lawyers to sue. Prop 37 does not give any penalties from labeling violations to consumers or lawyers, unlike prop 65, which gives 25 percent of civil damages to the plaintiff. The person legally responsible for putting the label on a food item is the manufacturer, not the farmer and not the grocery store owner. For more information, see here.

Claim: Prop 37 “conflicts with science.”

In fact, there are a lot of unknowns about the safety of genetically engineered foods. There are some animal studies with negative findings. Both the World Health Organization and the American Medical Association state that GMOs should undergo mandatory safety testing. Even the 2012 American Cancer Societies Guidelines on Nutrition and Physical Activity says, “…long-term health effects are unknown.” Until we know more, shouldn’t they be labeled? For more information, see here.

Remember who is behind the “no on 37” campaign. It is basically the companies that create genetically modified seeds, pesticides, and processed foods. This includes Monsanto, Pepsi, Dow, Coca-Cola and Kellogg’s to name a few. Monsanto, one of the largest creators of genetically engineered seeds, also told us that DDT and Agent Orange were safe. Can we really trust what these companies say about prop 37? If you follow the money, you will see that that the biggest contributor to the “no on 37” campaign is Monsanto. Remember that when you see the negative ads on TV, such as this one, with “major funding from Monsanto.”

In addition, most of the newspapers that say “no on 37” are owned by the same company called MediaNews. Alden Global Capital, a hedge fund firm, has a large stake in the company. Alden’s parent company is Smith Management LLC, a privately owned investment manager. It sounds like their interest is Monsanto and other traded companies and not our right to know what’s in our food! See here for more information.

Over 50 countries around the world label genetically engineered foods. Some have banned them. The only reason they aren’t labeled in the U.S. is that companies that make genetically modified seeds, chemicals, and junk food don’t want you to know what you are eating. Prop 37 would put an end to that, but we need your help. Please vote YES on prop 37! We can win against these big corporations. While we don’t have a lot of money, we do have the power of the people. That means you! Please do what you can to get the correct information out and share this article with everyone you know in California. Thank you!

For more information, go to http://www.CaRightToKnow.org

What You Need to Know About GMOs (genetically modified organisms)

Posted on July 6, 2012 by Carole Bartolotto, MA, RD

An important proposition will be on the November 2012 ballot in California which requires the labeling of genetically modified foods. This proposition, if it passes, could change the face of American agriculture. Biotech companies and food manufacturers will be spending between 50 and 100 million dollars and saying just about anything to prevent this from passing. Read on for the most commonly asked questions about GMOs.

Are genetically modified organisms in the foods you eat?

What do canned chicken soup, fast food French fries, sodas, potato chips, corn flakes, canola oil, salad dressing, corn chips, apple pie, and tofu all have in common? They all most likely contain GMOs (genetically modified organisms) also know as genetically modified or engineered foods.

What are GMOs?

Genetically modified organisms are plants or animals created through the process of genetic engineering. GMOs have a piece of DNA from a totally different species, such as viruses or bacteria, forced into their DNA. Genetically engineered soybeans, for example, have DNA from bacteria and viruses sliced into their DNA to help them withstand the onslaught of weed killers such as Roundup. Genetically engineered corn has DNA added so that it has a pesticide built right into it. This process creates a whole new species of plant that would have never occurred in nature.

Hybrid foods are completely different. Hybrids are created when cross pollination occurs between plants. This process can be facilitated by man or it can occur spontaneously in nature.

Even though GMOs have been in our food supply since 1996, most people in the U.S. know little about them. Actually, the 2006 Pew Initiative on Food and Biotechnology poll found that only 26% of American consumers believe that they have ever eaten a food that was genetically engineered. The truth is most people, including babies and children, eat them every single day.

Which foods are genetically modified?

As of 2012, nearly all soy beans, corn, canola, cotton, and sugar beets are GMO. From these crops, products such as corn oil, canola oil, cottonseed oil, high fructose corn syrup, sugar, and many more are created and added to processed foods. This is why nearly 80% of processed and most fast foods contain GMOs.

Other crops that are genetically engineered include Hawaiian papaya, a small amount of zucchini and yellow squash, and alfalfa. The Food and Drug Administration (FDA) is also considering approving a GMO salmon, which would grow much larger and faster than regular salmon.

Are genetically modified foods safe?

Despite what the food manufacturers and biotech companies might say, there is little research on the long-term effects of GMOs on human health and the environment. The FDA has allowed GMOs into our food supply with only the research and assurances of safety from the biotech companies that create them. Interestingly, the person at the FDA responsible for this decision was Michael Taylor, former attorney for Monsanto (the largest producer of GMO seeds).

Independent research has found that several varieties of GMO corn caused organ damage in rats. Other studies have found that animals were losing their ability to reproduce. There are also concerns that GMOs can increase allergies or cause immune system problems.

Environmental issues are also a cause for concern. GMOs allow farmers to use more weed killers, exposing both us and the environment to more toxins. Super weeds and super bugs that are resistant to the weed killers and the pesticides built into GMOs are now showing up. The monarch butterflies are on the decline due to GMO farming which kills the milkweed where they lay their eggs. In addition, GMO crops can cross pollinate with non-GMO crops, irreversibly changing the face of plant life with unknown consequences.

Are genetically modified foods labeled?

The U.S. is one of the only developed nations that does not require labeling of GMOs. Fifty countries including all of Europe and even China require labeling of genetically modified foods. Many European countries have banned GMOs.

Will labeling genetically modified foods increase the cost of food?

The California Right to Know Genetically Engineered Food Act will not increase the cost of food for you or food producers. It simply adds a label to genetically engineered food. Companies change their labels all the time. Remember, when companies where required by law to add trans fats to labels, the cost of food did not go up.

What can I do to eat fewer GMOs?

Vote “yes” on Proposition 37, the California Right to Know Genetically Engineered Food Act, which will require that genetically engineered foods are labeled. It will be on the November 2012 ballot. Once GMOs are labeled, we can make an informed choice. We have a right to know what’s in the food we are eating and feeding to our families. Visit carighttoknow.org for more information about the proposition and the truths vs. myths about it.
Buy Organic. All USDA certified organic foods are free of GMOs.
Avoid nonorganic products that contain GMO foods including soy, corn, canola, cottonseed, and sugar beets. Read labels. If the food contains high fructose corn syrup, corn oil, soybean oil, cottonseed oil, canola oil, or sugar, it probably contains GMOs.
Look for the “Non-GMO Project Verified” label. Some companies have voluntarily labeled their foods.

Shop at Trader Joe’s. All of their produce and all Trader Joe’s brand foods are sourced to be free of GMOs. So look for “Trader Joe’s” on the label.
Try Whole Food Market. Their 365 Everyday Value labeled foods are sourced to be free of GMOs.
Try Follow Your Heart labeled foods. They are also sourced to be free of GMOs.
Use the free iPhone app Shop No GMO.
Go to nongmoshoppingguide.com and download their shopping guide.
Visit nongmoproject.org for help choosing products without GMOs including supplements and vitamins.

Videos:

The Future of Food is an important documentary about unlabeled, patented, genetically engineered foods. You can watch it here for free.
Here is a clip from the above documentary about the process of genetic engineering.
Even Dr. Oz supports the labeling of GMOs. See here.
Bill Maher supports GMO labeling too. See here.

Resources and References:

Why Genetically Modified Foods Should be Labeled, LA Progressive.com.
Go to earthopensource.org Then click on “GMO Myths and Truths” in the Featured Report section.
New analysis of a rat feeding study with a genetically modified maize reveals signs of hepatorenal toxicity. Séralini, G.-E. et al. Arch. Environ Contam Toxicol., 52: 596-602, 2007.
A three generation study with genetically modified Bt corn in rats: Biochemical and histopathological investigation. Kilic A and Akay MT. Food and Chemical Toxicology, 46: 1164-1170, 2008.
Biological effects of transgenic maize NK603xMON810 fed in long term reproduction studies in mice. Velimirov A et al. Bundesministerium für Gesundheit, Familie und Jugend Report, Forschungsberichte der Sektion IV Band 3/2008.

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Is the Movement to Label GMOs Anti-Science?

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