In 2004, FDA researcher Renee Dufault investigated whether high-fructose corn syrup (HFCS) could contain mercury residues from mercury-cell caustic soda used to manufacture lye for corn processing. Her initial testing found trace mercury in 45% of 20 samples. According to the source, additional HFCS samples were tested by two independent federal and academic laboratories, which also reported low mercury levels in HFCS and foods containing it.
Dufault and academic collaborators presented preliminary results to the FDA’s Center for Food Safety and Applied Nutrition in October 2005. She says the agency then directed her to halt the investigation and denied access to federal extramural data when she tried to publish in 2006. Dufault left the FDA in 2008, citing the agency’s lack of support, and published the findings with collaborators in 2009. Her later claims that HFCS-related mercury exposure contributes to autism or ADHD through “macroepigenetics” remain models and should not be confused with established causal evidence.