In the study, some Chinese children were fed golden rice, which had been genetically modified to produce beta carotene, a precursor to vitamin A formation. Other children in the study ate meals containing spinach or beta carotene capsules. Scientists wanted to determine how well the beta carotene converted to vitamin A after the rice was eaten. Parents were told their kids were eating rice that contained beta carotene, but they weren't told it got this way through genetic modification. They were also not told about skepticism and controversy surrounding GMO foods generally and golden rice specifically.