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High folate intake may reduce risk of colorectal cancer
Date:7/5/2011

Intake of high levels of folate may reduce colorectal cancer risk, according to a new study in Gastroenterology, the official journal of the American Gastroenterological Association (AGA) Institute. Folate is a water-soluble B vitamin that occurs naturally in food.

"We found that all forms and sources of folate were associated with lower risk of colorectal cancer," said Victoria Stevens, PhD, of the American Cancer Society and lead author of this study. "The strongest association was with total folate, which suggests that total folate intake is the best measure to define exposure to this nutrient because it encompasses all forms and sources." Total folate includes naturally occurring food folate and folic acid from fortified foods and dietary supplements.

A research team investigated the association between folate intake and colorectal cancer among 99,523 participants in the Cancer Prevention Study II Nutrition Cohort; a total of 1,023 participants were diagnosed with colorectal cancer between 1999 and 2007, a period entirely after folate fortification began. Neither higher nor lower risk was observed during the first two years of follow-up (1999 to 2001), while associations were statistically significantly inverse for the subsequent years (2002 to 2007).

The findings of this study add to the epidemiologic evidence that high folate intake reduces colorectal cancer incidence. Further, one important difference between the current study and previous studies was the separate assessment of natural folates and folic acid. Previous studies that discriminated between folates considered only the source (i.e., diet versus supplement) and not the chemical form.

The study also addressed concerns that the intake of high levels of folate frequently consumed in the U.S. as a result of the recent increase in the use of folate-containing supplements and mandatory folate fortification of food may actually increase risk of cancer. No
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Contact: Alissa J. Cruz
media@gastro.org
301-272-1603
American Gastroenterological Association
Source:Eurekalert

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