Heralded on the cover of Time magazine in 2000 as a genetically modified crop with the potential to save millions of lives in the developing world, Golden Rice is still years away from field introduction and even then, may fall short of lofty health benefits still cited regularly by GMO advocates.

“Golden Rice is still not ready for the market, but we find little support for the common claim that environmental activists are responsible for stalling its introduction. GMO opponents have not been the problem,” says lead author Glenn Stone, professor of anthropology and environmental studies at Washington University in St. Louis.

First conceived in the 1980s and a focus of research since 1992, Golden Rice has been a lightning rod in the battle over genetically modified crops.

GMO advocates have long touted the innovation as a practical way to provide poor farmers in remote areas with a subsistence crop capable of adding much-needed vitamin A to local diets. A problem in many poor countries, vitamin A deficiencies leave millions at high risk for infection, diseases, and other maladies, such as blindness.

Some anti-GMO groups view Golden Rice as an over-hyped Trojan Horse that biotechnology corporations and their allies hope will pave the way for the global approval of other more profitable GMO crops.

GMO proponents often claim that environmental groups such as Greenpeace should be blamed for slowing the introduction of Golden Rice and thus, prolonging the misery of poor people who suffer from vitamin A deficiencies.

A new study published in the journal Agriculture & Human Values reports little evidence that anti-GMO activists are to blame for Golden Rice’s unfulfilled promises.

“The rice simply has not been successful in test plots of the rice-breeding institutes in the Philippines, where the leading research is being done,” Stone says. “It has not even been submitted for approval to the regulatory agency, the Philippine Bureau of Plant Industry (BPI).”

“A few months ago, the Philippine Supreme Court did issue a temporary suspension of GMO crop trials. Depending on how long it lasts, the suspension could definitely impact GMO crop development. But it’s hard to blame the lack of success with Golden Rice on this recent action.”

‘Humanitarian’ GMO crops

While activists did destroy one Golden Rice test plot in a 2013 protest, it is unlikely that this action had any significant impact on the approval of Golden Rice.

“Destroying test plots is a dubious way to express opposition, but this was only one small plot out of many plots in multiple locations over many years,” Stone says. “Moreover, they have been calling Golden Rice critics ‘murderers’ for over a decade.”

Stone was an early advocate for keeping an open mind about “humanitarian” GMO crops, such as Golden Rice, and also supported the development of a genetically modified strain of cassava, a starchy root crop eaten by subsistence farmers across much of Africa. Unfortunately, efforts to develop a genetically improved, more productive, and disease-resistant strain of cassava also appear to be a long way from practical field introduction, he notes.

“Golden Rice was a promising idea backed by good intentions,” he says. “In contrast to anti-GMO activists, I argued that it deserved a chance to succeed. But if we are actually interested in the welfare of poor children—instead of just fighting over GMOs—then we have to make unbiased assessments of possible solutions. The simple fact is that after 24 years of research and breeding, Golden Rice is still years away from being ready for release.”

Since 2013, Stone has directed a major Templeton Foundation-funded research project on rice in the Philippines. His research compares Golden Rice to other types of rice developed and cultivated in the Philippines. These include high-yield “Green Revolution” rice strains developed in the 1960s in an effort to industrialize rice farming, and “heirloom” landrace varieties long cultivated on the spectacular terraces of the Cordillera mountains of northern Luzon.

The added genes

As part of the Golden Rice initiative, researchers introduce genes into existing rice strains to coax these GMO plants into producing the micronutrient beta carotene in the edible part of the grain. The presence of beta carotene gives the genetically modified rice a yellow hue, which explains the “golden” in its name.

Researchers continue to have problems developing beta carotene-enriched strains that yield as well as non-GMO strains already being grown by farmers. Scientists in Bangladesh also are in the early stages of confined field trials of Golden Rice, but it is doubtful that these efforts will progress any quicker than in the Philippines.

Even if genetic modification succeeds in creating a strain of rice productive enough for poor farmers to grow successfully, it’s unclear how much impact the rice will have on children’s health.

It’s still unknown if the beta carotene in Golden Rice can even be converted to vitamin A in the bodies of badly undernourished children. There also has been little research on how well the beta carotene in Golden Rice will hold up when stored for long periods between harvest seasons, or when cooked using traditional methods common in remote rural locations, researchers say.