Scientists do not know exactly why one person develops cancer and another does not. But Agricultural Research Service chemist Thomas Wang, who specializes in cancer prevention research, says that there are "layers" of factors involved in the development of the disease. Wang works at the ARS Diet, Genomics, and Immunology Laboratory, which is part of the Beltsville (Maryland) Human Nutrition Research Center. Research shows that certain external risk factors increase the chance that a person will develop cancer. These include the molecules that are introduced into the human body by way of ingestion. "This layer involves peoples' diet complexity," says Wang. "Diet is a complex mixture of bioactive compounds that trigger huge amounts of biological activity."
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