Many studies show that people who are physically active are less
likely to cancer. Such associations don't prove that exercise
prevents cancer. But they are a hint. And if there's a biological
explanation for a protective effect, the case gets that much
Here are several biological explanations mentioned in the
Physical Activity Guidelines Advisory Committee (PAGAC) report,
which laid the scientific groundwork for the new set of exercise
guidelines due out in October 2008.
There's still quite a bit of conjecture involved, but you can see
why exercise might keep some people out of harms way of cancer.
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