By Kay Quinn Healthbeat Reporter

St. Louis (KSDK) - Exercise can lower your risk of many different types of diseases.

"The reason it's related to lower the risk of several cancers we think is probably different from cancer to cancer," said Dr. Kate Wolin from the Siteman Cancer Center.

Which makes sense, says Dr. Wolin, because while we tend to talk about cancer like it's one disease, it's actually a lot of different diseases that respond differently to exercise.

"For something like breast cancer, we know that exercise has the effect of lowering hormone levels and we know that higher levels of estrogen like compounds and hormones can increase risk of breast cancer so exercise probably has a hormonal effect in breast cancer."

In something like colon cancer, it's more likely to have the effect of lowering inflammation.

"The other thing is we think its related to insulin pathways so we know that diabetes which is a disorder of the insulin regulating pathways is associated with an increased risk of colon cancer and that exercise can help the body regulate insulin levels," said Dr. Wolin.

For overall health and fitness, including cancer-fighting effects, 30 minutes of moderate intensity activity a day is what's recommended.

"We really see a kind of parallel where the more you do the more benefits you seem to reap," said Dr. Wolin.

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