In addition, advocacy groups are concerned that a few international conglomerates, through their ownership of GMO technology, can gain or consolidate excessive dominance of the global food supply.

In a just-released report, "Non-GMO Foods: U.S. Market Perspective," Packaged Facts estimates that non-GMO food and beverage sales in the U.S. will be approximately $178 billion in 2013, accounting for almost a quarter of all food and beverage sales.  Packaged Facts projects that by 2017 non-GMO products will make up around 30% of total food and beverage sales, with a value of about $264 billion.

A key element in the growth of the non-GMO segment of the overall food and beverage market will be the ongoing expansion in the demand for organic and natural foods, with is intertwined with the market for non-GMO foods. 

According to David Sprinkle, the research director at Packaged Facts, a variety of factors, including the introduction of mandatory GMO labeling, could spur the development of non-GMO sales to a higher percentage of the total market. Conversely, an economic downturn or the widespread acceptance of new GMO seafood, meat and poultry products are among the factors that could slow sales.

There is widespread agreement within the scientific community that GMOs pose no threat to human health or the environment.  Nevertheless, there is a broad base of concern among advocacy groups about GMOs, a concern driven in part by fear of unknown ramifications.