When it comes to increasing one's risk for colon cancer, convincing risk factors include red meat, processed meat, body fatness & abdominal fatness. Attained adult height is also included but we don't have much control over that. Alcohol consumption is a bit trickier due to less available data for women, but it does appear to increase risk in both sexes.
Don't forget that all the data we have right now is epidemiologic, observation & associative in nature. We don't have any evidence of causation. With that said, it's difficult to find anything bad in increasing one's physical activity and eating more dietary fiber. And don't forget that more garlic means lower likelihood of confronting a vampire, right?