Foods that have the potential to cause inflammation in the digestive tract can increase the risk of developing colorectal cancer.
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‘Diet can influence inflammation in the body and can be a modifiable risk factor to prevent colorectal cancer.’
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For the study, 121,050 male and female health care professionals were followed for 26 years in long-term studies and data from completed food questionnaires about what they ate was collected; data analysis was done in 2017. 
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Scores based on 18 food groups were characterized by their inflammatory potential and calculated from participants' food questionnaires administered every four years (exposure).
Higher scores reflecting inflammation-causing diets were associated with a higher risk of developing colorectal cancer in men and women; the risk appeared to be higher among overweight or obese men and lean women and among men and women not consuming alcohol.
This is an observational cohort study where people were followed over time. Because researchers are not intervening for purposes of the study they cannot control for all the natural differences that could explain the study findings.
Source-Eurekalert