Tests like Lu's aren't done on every apple and grape in the supermarket. High costs prevent widespread testing of foods in the United States, according to Arnold Schecter, of the University of Texas School of Public Health.
Schecter's research found chemicals, known as persistent organic pollutants and endocrine disruptors, in food sample from Dallas, Texas. The most common contaminants were DDT, endosulfans, aldrin, PCB and PFOA. Environmental Health Perspectives published Schecter's research, as well.
"In large enough amounts and in genetically sensitive people, they can cause nervous system damage, reproductive and developmental system damage, immune system disruption, sometimes cancer, and in rare cases, at least in theory, death," Schecter told Discovery News.
The long-term effects of eating even "safe" levels of mixtures of pesticides and other chemicals may affect Americans' health, said Schecter.
Schecter offered tips to concerned parent on how to reduce exposure to pesticides and other contaminants.