The Island of Conclusions: Trying to Make Sense Out of Genetically Engineered Food

By Dr. Guy Crosby, PhD, CFS



Crosby G. The island of conclusions: trying to make sense out of genetically engineered food. Harvard Public Health Review. 2018;13.


The Island of Conclusions: Trying to Make Sense Out of Genetically Engineered Food

Several years ago a colleague introduced me to “The Island of Conclusions,” an allegory from the well-known children’s story “The Phantom Tollbooth” written by Norton Juster in 1961 (Juster 1961). In one section of the story the little boy Milo and his dog Tock are driving along in their magic car when suddenly they see a beautiful island. One by one they both jump to the island only to discover there are only rocks and twisted stumps. Confused, they ask a passerby where they are. “You’re on the Island of Conclusions. Make yourself at home,” said the passerby. “You’re apt to be here for some time.” “But how did we get here?” asked Milo. “You jumped, of course,” explained the passerby. “That’s the way everyone gets here. It’s really quite simple: every time you decide something without having a good reason, you jump to conclusions whether you like it or not.”


Many have jumped to the conclusion that genetically modified foods are harmful to humans and the environment without carefully reviewing the evidence. I think Monsanto, a multinational agricultural biotechnology company, shares much of the blame. When Monsanto set its initial goal in 1996 to commercialize soybeans that were genetically altered for resistance to their popular herbicide glyphosate, it pursued the short-term profitable use of this new technology before promoting its long-term benefits. Soon after (1999) Monsanto also developed what is known as ‘Terminator Technology’ to produce sterile seeds that required farmers to purchase new seed every year. Following significant farmer pushback the company pledged not to commercialize the controversial seed. Yet even today, almost 20 years later, many people that I meet who are opposed to genetically modified crops still believe Monsanto controls the biotech market by selling sterile seed.  As a result, many have concluded that both Monsanto (soon to be purchased by Bayer AG) and genetically modified crops pose a threat. Perhaps to make amends, Monsanto launched a genetically engineered draught tolerant corn in 2010. Yet, even after more than twenty years of growing GM crops, many skeptics remain unwilling to concede that science shows the benefits far outweigh any risks. Some have been stuck on the Island of Conclusions for a long time.


It is important to distinguish between genetically modified (often abbreviated GMO) and genetically engineered (GE) crops and food. “Modify” means to change in form or character, or alter. Plants that have been hybridized by traditional plant breeding methods to modify their genetic traits, such as stronger stalks, or tighter seed heads, have been genetically modified from their ancestral plants by human intervention. GE means the genetic traits have been altered by the deliberate insertion of a foreign gene. Thus, virtually every plant grown for food today is a genetically modified plant. Dr. Norman Borlaug, the father of the Green Revolution, won the Nobel Peace Prize in 1970 for developing new hybrids of wheat and rice with vastly increased yields through genetic modification, saving the lives of a billion people living in developing countries such as Mexico, India, and Pakistan. Today, GE crops offer even greater potential to meet the world’s growing need for food.


For decades, Dr. Robert Paarlberg.1 has carefully researched the world of food and agriculture. His book, Starved for Science: How Biotechnology Is Being Kept Out of Africa, raised the issue of how modern biotechnology could greatly increase food production and reduce poverty and starvation in Africa (Paarlberg 2008). Yet, fear of genetically modified crops in Europe, Africa’s biggest market, is preventing this from happening. In his more recent book, Food Politics: What Everyone Needs to Know, Paarlberg digs deeper into the growing disparity of the impact of GE foods between wealthy and developing countries (Paarlberg 2013). Unfortunately, Paarlberg has been excoriated for his insightful views by anti-GMO environmental groups, such as Greenpeace.


The Golden Rice Project illustrates the conflict between anti-GMO organizations and the development of GE food. GE rice was developed almost twenty years ago by scientists at the Swiss Federal Institute of Technology and the University of Freiburg (Ye 2000). Inserting a gene from daffodil into rice created a GE form, called Golden Rice, with significantly higher levels of yellow beta-carotene, the precursor of vitamin A. Vitamin A deficiency causes blindness and death in children in developing countries that depend on rice as a major food source. The World Health Organization estimates as many as 250 million children are vitamin A deficient, and as many as 500,000 vitamin A deficient children become blind each year, with half dying within twelve months of becoming blind (WHO). In August 2013 a critical field trial of Golden Rice in the Philippines was destroyed by a group of anti-GMO activists, thus halting development. Greenpeace actively opposes the development of Golden Rice stating on its website that Golden Rice is “environmentally irresponsible and could compromise food, nutrition and financial security.” On June 30, 2016, 107 Nobel Prize winners signed a letter critiquing Greenpeace’s opposition to GE crops, and specifically asking it to halt its campaign against Golden Rice. (Chokshi 2016) Greenpeace has not changed its position.


Another example: from 1992-1997 nearly the entire papaya crop grown in the Hawaiian Islands was threatened with destruction by the ringspot virus. Scientists at the University of Hawaii and Cornell University leveraged genetic engineering methods to quickly develop by 1998 a GE papaya resistant to the virus in a fraction of the time required by traditional techniques. They saved the crop from almost certain destruction. The GE papayas remain resistant to the virus today, yet, anti-GMO activists continue to randomly attack and destroy fields of GE papaya trees, causing financial hardship for farmers.


In 2014, Italian scientists (University of Perugia) completed an evaluation of 1,783 research papers published over a ten-year period on the safety and environmental impacts of GE crops and foods (Nicolla 2014). The researchers couldn’t find a single credible example demonstrating that GE crops or foods pose any harm to humans or animals. Opponents often cite studies showing GE crops use more pesticides without increasing yields (Perry 2016). Yet, in 2014, scientists at the University of Göttingen analyzed 147 research papers published over a ten year period that directly compared the results of growing GE crops with conventional crops (Klümper 2014). The analysis showed GE crop yields were almost 22% higher while using nearly 37% less quantity of pesticides. Perhaps not surprisingly, this study from Germany received very little attention. In May 2016, the U.S. National Academies of Sciences, Engineering and Medicine completed a study of almost 900 research and related publications on the safety of GE crops. Their study found “no substantiated evidence of a difference in risks to human health between current commercially available GE crops and conventionally bred crops, nor did it find conclusive cause-and-effect evidence of the environmental problems from the GE crops.” However, the report concluded that “evolved resistance to current GE characteristics in crops is a major agricultural problem” (National Academies of Sciences, Engineering and Medicine 2016). This latter point is perhaps the primary reason that environmental groups continue to oppose GE crops. Clear evidence has shown that seven species of weeds now account for 99% of the reported areas in the United States where glyphosate-resistant weeds have been identified (University of Minnesota 2015). This problem must be urgently addressed for farmers, the environment, the future of agriculture, and the world’s food supply.


Although environmental groups are justifiably concerned with the increased resistance of weeds to glyphosate they fail to acknowledge that a number of studies have shown the production of GE crops has had a significantly positive impact on the environment by reducing greenhouse gas emissions. The reduction occurs in two ways: 1) use of less pesticide reduces the number of applications and fuel required, releasing less carbon dioxide into the atmosphere, and 2) better control of weeds allows more no-till agriculture resulting in sequestration of more soil carbon.  A recent study found the global reduction in carbon dioxide released into the atmosphere from these two sources between 1996-2010 amounted to a conservative estimate of 146 billion kilograms, with the majority of savings occurring during the last few years of the study due to increased planting of GE crops (Brookes 2012).


A new genetic engineering method known as CRISPR/Cas9 promises to further revolutionize the genetic engineering of crops. This technology allows genes to be inserted faster, cheaper, and more precisely than ever before. It has been claimed to be “probably the biggest revolution in plant science ever,” and “one of the most exciting breakthroughs of the 21st century.” CRISPR/Cas9 is composed of two rather large molecules linked together. One is a short segment of RNA that binds to a specific region of DNA, and the other is an enzyme that snips the DNA at an exact location. A new gene can then be inserted in a precise location within the DNA. Using this new technology both large and small biotechnology companies are targeting stress responses in plants to produce improved yields, drought and disease resistance. These modifications will help crops cope with the changing climate conditions throughout the world. James Collins, head of DuPont’s agriculture business predicts new products based on this technology could be on the market as early as five years (Bomgardner 2016).


Between 1996, when they were first introduced in the United States, and 2015, GE crops were planted on a total of almost 5 billion acres in 28 countries (Business Wire 2016). To put this into perspective, the entire landmass of the United States covers 2.3 billion acres. Not a single case of human illness resulting from food produced from GE crops has been reported. It is time for the world community to overcome the fear of genetically engineered food and unleash this incredible technology to solve the environmental issues of agriculture and produce enough healthy food for a growing population. It’s time to leave the island.


Bomgardner, M. 2016. “Transforming Agriculture, Again”. Chemical and Engineering News 94(34): 32-38.


Brookes, G, and P. Barfoot. 2012. “Global Impact of Biotech Crops: Environmental Effects 1996-2010”. GM Crops and Food: Biotechnology in Agriculture and the Food Chain. 3: 129-137.


Business Wire. 2016. “Biotech/GM Crops Planted on Two Billion Hectares from 1996 to 2015”. April 13, 2016.


Chokshi, N., 2016. “Stop Bashing G. M. O. Foods, More than 100 Nobel Laureates Say”. New York Times, July 30, 2016.


Juster, N. 1961. “The Phantom Tollbooth”. Random House, New York, NY.


Klümper, W. and M. Qaim. 2014. “A Meta-Analysis of the Impacts of Genetically Modified Crops”, PLOS One 9(11): e111629.


National Academies of Sciences, Engineering and Medicine Report. 2016. “Genetically Engineered Crops-Experiences and Prospects”.


Nicolla, A., A. Manzo, F. Veronesi, and  D. Resellini. 2014. “An Overview of the Last 10 Years of Genetically Engineered Crop Safety Research”. Critical Reviews in Biotechnology 34(1): 77-88.


Paarlberg, R. 2008. “Starved for Science: How Biotechnology Is Being Kept Out of Africa”, Harvard University Press, Cambridge, MA.


Paarlberg, R. 2013. “Food Politics: What Everyone Needs to Know”, second edition, Oxford University Press, New York, NY.


Perry, E., et al. 2016. “Genetically Engineered Crops and Pesticide Use in U.S. Maize and Soybeans”. Sci. Adv. August 31, 2016.


University of Minnesota. 2015. “Herbicide Resistant Weeds-A Global Perspective”. Workshop, December 9, 2015.


World Health Organization, “Micronutrient Deficiencies-Vitamin A Deficiency”.


Ye, X., et al. 2000. “Engineering the Provitamin A (Beta-Carotene) Biosynthetic Pathway into Carotenoid-Free Rice Endosperm”. Science 287(5451): 303-305.


  1. Robert Paarlberg retired after 39 years as a professor of political science at Wellesley College. He is now a fellow teacher at the Harvard Chan School and an adjunct professor of public policy at the Harvard Kennedy School.

About the Author

Dr. Guy Crosby, PhD, CFS

Guy Crosby developed an early fascination with chemistry in high school. With the help of his father he built a small laboratory in the basement of their home where he first experimented with the chemistry of food. Guy went on to obtain a B.S. degree in chemistry from the University of New Hampshire, and Ph. D. degree in organic chemistry from Brown University in 1969, researching the chemistry of cholesterol. Following graduate school he and his wife Christine moved to Palo Alto, California. They spent two wonderful years as postdoctoral research associates at Stanford University, where they met other organic chemists interested in food, wine, and cooking. Soon a position opened at a local Silicon Valley startup company developing new food ingredients, providing Guy with the opportunity to combine his expertise in organic chemistry with food science.

Ten years later he moved with his family to Princeton, New Jersey to work for FMC Corporation, initially in the Agricultural Products Division, and then as Director of R & D for the Food Ingredients Division, establishing a global network of laboratories in North America, Central America, Europe, and Asia. One more move brought them back home to Massachusetts in 1996. He worked as Vice President of R & D for Opta Food Ingredients, Inc. until the end of 2001, culminating more than thirty years in food-related research and development.

Instead of retiring, Guy launched a new career in teaching. He started as a visiting lecturer teaching food science in the Department of Nutrition at the Harvard T.H. Chan School of Public Health, in 2003. Shortly thereafter, he joined the Department of Chemistry and Food Science at Framingham State University, teaching chemistry and food science as a full-time associate professor beginning in 2005. In August of 2011, he retired from full-time teaching. He continues to teach as an adjunct associate professor at Harvard, and has taught food science to more than 350 students.

Looking for new avenues to combine science with his enthusiasm for cooking, Guy approached Cook’s Illustrated Magazine in 2004 to see if they needed help with food science. The magazine prides itself in taking a scientific approach to recipe development. In early 2005, he began working with the magazine as a consulting editor, and then as Science Editor. After 12.5 years with America’s Test Kitchen, Guy became the Science Editor for Christopher Kimball’s Milk Street Kitchen, in August 2017. 

Guy also lectures widely on topics in food science, food chemistry, and cooking science. He recently organized a symposium on “Trends in Cooking Science” for the 248th meeting of the American Chemical Society in San Francisco, California.  

Guy is an emeritus member of the American Chemical Society (50 years), a professional member of the Institute of Food Technologists, and American Society for Nutrition. He is an external advisor for the EcoGastronomy program at the University of New Hampshire; a member of the Food Task Force for Boston’s Museum of Science; and a Food Science Communicator for the Institute of Food Technologists. He also serves on the Food Science Advisory Board for Framingham State University.

Guy has authored 45 scientific papers, received 17 U.S. patents, and published two books with America’s Test Kitchen: the James Beard award nominated Cook’s Science (2016) and the New York Times bestseller The Science of Good Cooking (2012).
On April 1, 2013, Guy was officially included in the first group of Certified Food Scientists (CFS) approved by the Institute of Food Technologists.