National Academy of Sciences' Reports on Diet and Health--Are They Credible and Consistent?

Pursuant to a congressional request, GAO examined issues relating to two reports issued by the National Academy of Sciences (NAS). Because the reports differed about whether the risk of chronic disease can be reduced through dietary modification, GAO was asked to: (1) study NAS processes of providing reports on controversial subjects; and (2) determine the range of issues pertaining to the relationship of diet to cancer.