This Reuter’s article shares details about these surprising findings:
No link seen between high-carb diet, colon cancer
NEW YORK – Wed Nov 3, 2010 (Reuters Health)
Chinese women who eat a traditional diet rich in white rice and other starchy foods that spur a surge in blood sugar do not seem to have an elevated risk of colon cancer, a new study suggests.
The findings, reported in the American Journal of Clinical Nutrition, add to the conflicting body of evidence as to whether foods with a high “glycemic index” are related to an increased risk of colon cancer.
Glycemic index, or GI, refers to how rapidly a carbohydrate causes blood sugar to rise. High-GI foods, like white bread, white rice and potatoes, tend to make blood sugar levels rise quickly. With low-GI foods, such as lentils, soybeans, yogurt and many high-fiber grains, blood sugar levels also rise, but not as fast and not as high.
A related concept, called the glycemic load, refers to both the GI and the amount of carbohydrates in a given food: a low-calorie piece of fruit, for instance, may have a relatively high GI, but still provide only a small glycemic load.
The idea that a diet with a high glycemic load might contribute to colon cancer risk is based on human physiology: High blood sugar levels trigger release of the blood-sugar-controlling hormone insulin, which — along with a related hormone called insulin-like growth factor 1 — may stimulate the growth and spread of cancer cells.
In line with that, a number of studies have found that people with type 2 diabetes, who have abnormally high blood sugar and insulin levels, get colon cancer more often than do people without diabetes.
So in theory, a diet heavy in high-GI foods could be a risk factor for colon cancer. But studies on the question have so far come to conflicting conclusions.
Why? Read all about it at: Reuters.com – Carbohydrates and Colon Cancer.
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