Colon cancer survivors whose diet is heavy in complex sugars and carbohydrate-rich foods are far more likely to have a recurrence of the disease than are patients who eat a better balance of foods, a new study by Dana-Farber Cancer Institute researchers indicates.
The connection is especially strong in patients who are overweight or obese, the authors write. More than 1,000 patients with advanced (stage III) colon cancer participated in the study, one of the first to examine how diet can affect the chances that the disease will recur. The findings are being published online by the Journal of the National Cancer Institute and will appear later in the journal's print edition.
Although the results point to a potential hazard of a high-carbohydrate diet for colon cancer patients, the take-home message is not a conclusive "Eat less sugar," said lead author Jeffrey Meyerhardt, MD, MPH. "Our study certainly supports the idea that diet can impact the progression of colon cancer, and that patients and their doctors should consider this when making post-treatment plans. But further research is needed to confirm our findings."
Recent studies have shown that colorectal cancer survivors whose diet and activity patterns lead to excess amounts of insulin in the blood have a higher risk of cancer recurrence and death from the disease. High insulin levels can be produced by eating too many starchy and sugar-laden foods. In a previous study of advanced-stage colon cancer patients, Meyerhardt and his colleagues found that those with a typical "Western" diet - marked by high intakes of meat, fat, refined grains, and sugar desserts - were three times more likely to have a cancer recurrence than those whose diets were least Western. The new study was conducted to explore which component of the Western diet is most responsible for the increased risk of recurrence.
The study involved 1,011 stage III colon cancer patients who had undergone surgery and participated in a National Cancer Institute-sponsored Cancer and Leukemia Group B clinical trial of follow-up chemotherapy for their disease. Participants reported their dietary intake during and six months after the trial.