In this study, physicians from the United States examined the association between rectal cancer, and plant food and fiber intakes.
The team compared 952 incident cases of rectal cancer with 1205 population-based controls living in Utah and northern California
|5 servings of vegetables per day was required to reduce the risk of rectal cancer.|
|American Journal of Clinical Nutrition|
The physicians determined that rectal cancer was inversely associated with intakes of vegetables (odds ratio (OR) 0.72), fruit (OR 0.73), and whole-grain products (OR 0.69).
They found that a high intake of refined-grain products was directly associated with an increased risk of rectal cancer (OR 1.42).
The team also determined that a high intake of dietary fiber reduced the risk of rectal cancer (OR 0.54).
The reduced risk of rectal cancer associated with vegetable (OR 0.48), fruit (OR 0.63), and fiber (OR 0.40) intakes was the strongest for patients who received the diagnosis after age 65 years.
The physicians established that 5 servings of vegetables per day was needed to reduce the risk of rectal cancer.
Dr Martha Slattery's team concluded, "The results suggest that plant foods may be important in the etiology of rectal cancer in both men and women".
"Age at diagnosis appears to play an important role in the association".