Almost two decades after Doll and Peto (1981) provided evidence that one th
ird of cancer deaths are related to diet, it remains unclear which dietary
components may be key in cancer prevention. Although the complexity of the
diet can become overwhelming, the National Cancer Institute (NCl) of the Na
tional Institutes of Health (NIH) has remained steadfast in its commitment
to defining the roles that diet and nutrition have in the development of ca
ncer and has provided increased research and training support to assist in
unraveling this interrelationship. Evidence for this sustained commitment i
s highlighted by a fourfold increase in NCI expenditures for nutrition rese
arch and training from 1983 to 1998; this substantial increase reflects a t
rend that is occurring in some universities and the private sector. More th
an one third of the nutrition-related NCI research is funded by the Divisio
n of Cancer Prevention. Supported investigations cover the gamut from basic
mechanisms of action of dietary constituents, methodology development, hum
an metabolic studies, clinical trials of dietary modification and the chemo
preventive potential of individual nutrients to population-based studies.