A much-cited 1981 study concluded that some 35 percent of human cancer deaths probably trace to carcinogens in foods-both synthetic chemicals, such as pesticides and food additives, and naturally occurring ones, like fungal toxins.
To get a better fix on the risks posed by such compounds, the National Research Council in Washington, D.C., set up a committee to study the amounts and toxicity of these chemicals in food and to compare them to data on the occurrence and potency of natur al cancer-fighting agents.
The committee's findings appear in "Carcinogens and Anticarcinogens in the Human Diet," a 417-page report issued on Feb. 15. Overall, its tone is reassuring, arguing that "the great majority of individual naturally occurring and synthetic chemicals in the diet appears to be present at levels below which any significant adverse biologic effect is likely, and . . . [thus] are unlikely to pose an appreciable cancer risk."
These compounds don't occur individually, however (SN: 7/3/93, p. 4). The report concedes that important questions remain regarding how to …