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One of the difficult areas in nutrition is sometimes giving precise answers.
We have, for a longtime, had strong epidemiology data saying that consumption of diets that
are rich in fruits and vegetables are associated with reduced risks for a number of chronic
diseases; vascular disease - the data are very strong.
And we have data that also says consumption of high plant foods diets reduces the risk
for certain cancers; either of their development or their progression.
One of the really hard questions right now in nutrition, as a science, is, what are the
factors that are responsible for this? And this is an important question because,
ultimately, maybe we can change agricultural practices or food industry practices, and
we'll increase those. But even before we have the firm identity
of these, what we have is very good data saying that if you want to reduce your risk for vascular
disease, as a population, or if you want to reduce your risk for cancer, increase that
fruit and vegetable intake.