I've heard that exercise can help prevent breast cancer. What kind of exercise does this mean?

Many researchers are looking at this question. Some studies show that exercise does reduce the risk of breast cancer. Other studies report little or no effect. The National Cancer Institute has found a way to measure activity on the job. This is called a physical activity index. Researchers report that a lifetime of physical activity reduces the risk of breast cancer. Activity on and off the job counts. The benefit is even more if the activity takes place before menopause. It's not clear how much exercise and physical activity is needed to prevent disease. The Centers for Disease Control and Prevention (CDC) tells us that even 10 minutes of activity each day is helpful. This can include housework, walking, gardening, bowling, or other similar activity. A large study of pre- and post- menopausal women in Buffalo, New York tested exercise as a way to prevent breast cancer. These researchers found that women who exercise long enough to work up a sweat have less risk of breast cancer.

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