People who are relatively sedentary are likely to be at a physical activity level or PAL of 1.55 to 1.60. An extra hour of moderate physical activity a day plus an hour of vigorous activity a week can raise the PAL from 1.55 or 1.6 to 1.75 or more. The panel feels that there is convincing evidence that regular physical activity protects against colon cancer. Also, regular physical activity possibly protects against cancer of the breast and lung. An added benefit of physical activity comes from its protection against overweight and obesity.
Obesity puts a person at a greater risk of some forms of cancer.
See Recommendation 2 .