A new study has found that the so-called Western diet high in sugar, refined grains and processed meat increases the risk of colorectal tumors. Scientists from the Birham and Wyman Hospital in the United States found that such a connection is due to the influence of the intestinal microbiota.
American researchers in the course of observing more than 130,000 people from the United States have established a link between the Western diet and colorectal cancer. This is not the first study to show that a diet high in processed meats, processed foods and carbohydrates increases the risk of bowel tumors. However, for the first time, scientists have demonstrated the mechanism of the impact of a harmful diet on the appearance of malignant neoplasms. They analyzed the diet as well as the DNA of E. coli strains in more than 1,000 colorectal tumors.
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The scientists were looking for bacterial strains that carry a separate genetic island called polyketide synthase, which codes for an enzyme that causes mutations in human cells. The Western diet has been associated with these island-rich tumors as well as E. coli, but not with other malignancies.
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The results support the hypothesis that Western diet increases the risk of colorectal cancer at the expense of the intestinal microbiota. This is the first study linking this eating style to specific pathogenic bacteria. And now it remains to find out exactly which component of the diet or lifestyle is associated with colorectal cancer containing this type of bacteria. (READ MORE) 
Birham and Women's Hospital
Healthy Life
The second largest teaching hospital at Harvard Medical School and the largest hospital in the Longwood Medical District of Boston, Massachusetts