Lifestyle

Editor's comment: Moderate exercise or physical activity is well known to be important for cancer prevention. One possible benefit is that physical activity enhances circulation and delivers oxygen to where it is needed. In an oxygen rich environment, cancer cells do not grow well and cancer researchers know this well. Exercise can also lower cancer-promoting hormones and prevent obesity, which can otherwise raise cancer risk. But no one should count on exercise as a sole preventative. Why? Because not all who do physical exercise have a zero risk for cancer. One needs also to avoid the risk factors such as medical radiation and hormone therapies that increase the risk of cancer.