According to the National Cancer Institute, the lack of physical exercise is the primary cause leading to an increase in the percentage of overweight and obese adults and children. Weight gain and obesity increases the risk of postmenopausal breast cancer, uterine cancer, colon cancer, kidney cancer, and esophagus cancer. This last week, Lance Armstrong was a guest speaker for CNN's Dr. Sanjay Gupta's Fit Nation college tour addressing the issue of obesity. There really isn't any breaking news or magic formula  when it comes to fighting the battle against obesity in this country. Moving more and eating less are the keys to success in reducing obesity and cancer risks. But even Armstrong, a world class athlete and cancer survivor, admits there are some days when he is not motivated to significant physical activity.

"For the last seven months I've sort of found myself in a position to where there were a lot of days where I said, 'I don't want to do anything today.' For a guy who did something for 20 years four or six hours a day, and then I got done and I said, 'No not today.' But now I'm in a position where I find myself wanting to do it again," Armstrong said. "I like junk food. If I had my choice I would eat a breakfast burrito for breakfast and a cheeseburger for lunch and Chuy's for dinner. But that's not the choice I make everyday because that would mean I would be 230 pounds very quickly." I don't know why, but I feel better about my semi-lack of self discipline now. The issues of maintaining healthy weight and physical movement are becoming an intense focal point for cancer prevention, and I think we will begin to hear more about this topic from well-known cancer survivors.