The rise in the rate of colorectal cancer in people in their 20s to 40s in a number of countries outpaces what could be attributed to genetics alone, scientists say. It’s prompted medical researchers to study lifestyle factors like changes in diet, weight, physical activity levels, drinking patterns and more. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.