Excess Weight Seems to Boost Breast Cancer Risk

"Physical activity reduces breast cancer risk both directly, by decreasing circulating estrogens, and also indirectly, by helping with weight control," she said. "Women are so concerned about breast cancer risk. Communicating that there are key things you can do to reduce risk -- watch your weight and be more active -- are valuable messages."

Ligibel agreed, noting that exercise might be valuable enough to counteract the strain on the body caused by obesity.

"You might not need to lose weight if you exercise," Ligibel said. "Exercise could affect the hormone levels and help keep cancer from occurring or recurring."

More information

To learn more visit the American Cancer Society.