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A new study in mice teases out the nuances of sex differences and lifestyle influences on colon cancer risk. The research will be presented virtually at the American Physiological Society’s (APS) New Trends in Sex and Gender Medicine conference.

Colon cancer is the third leading cause of cancer-related death in the U.S., and death rates among people younger than 55 have been steadily increasing. The American Cancer Society had estimated that about 53,200 people would die from colorectal cancer in 2020, including 3,640 adults younger than 50. A better understanding of the factors that contribute to colon cancer and the mechanisms behind protective factors could help address this trend.

A cross-institutional research team started by comparing an inflammatory marker associated with colon cancer risk in both male and female mice on a control diet. At baseline, concerta amitriptyline males showed higher levels of this inflammatory marker.

Next, they provided mice unlimited access to an exercise wheel. After 12 weeks of exercise, the males’ inflammation marker dropped to equal that of the females.

Researchers then introduced a high-fat diet. The high-fat diet increased inflammation in both sexes. Interestingly, when a high-fat diet was combined with exercise, only females showed a reduction in gut inflammation.

Further examination of colon tissue through a clinical measure called the proliferation index reinforced these findings. A higher proliferation index score indicates the greater the risk of disease. Females scored nearly 15% lower than males. Similarly, exercise reduced index scores by more than 30%.

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