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New research finally reveals the amount of exercise you need to do to lower your breast cancer risk

by , 20 July 2015

You've probably heard it before: Physical exercise can lower your risk of breast cancer. But researchers haven't been able to tell us just how much exercise it takes…

Christine Friedenreich, a leader of cancer epidemiology and prevention research at Alberta Health Services, and colleagues identified that body fat as a pathway to lowering cancer risk.

In an earlier study, they found that women who exercised 225 minutes a week showed dramatic drops in total body fat, abdominal fat and other adiposity measures.

These findings inspired the team to examine more closely. They specifically looked at the effects of the commonly-recommended 150 minutes of moderate to vigorous exercise a week on body fat measures. They compared these effects to a doubling of that amount of activity - 300 minutes a week - to see if more exercise had a greater effect in lowering body fat.

Read on for the full scoop…

A new study set out to find how much exercise you need to do each week to lower your breast cancer risk

JAMA Oncology published the study. For the study, Friedenreich found that indeed, among 384 non-active women past menopause, some of whom were normal weight and others who were overweight or obese, those randomly assigned to exercise for 300 minutes a week over the year-long study lost more body fat than those who were active for 150 minutes each week. 
 
The women didn’t change their diet or any other aspect of their lives; they just exercised their allotted amount, by walking, running, cycling or using an elliptical machine or treadmill.
 
Overall, the women exercising 300 minutes weekly lost 1 kg or 1% more body fat than those in the 150 minute group. The former also lost more abdominal fat and had a bigger drop in their waist to hip ratio. They didn’t, however, lose significantly more weight.
 
That last finding is important because many physical activity and cancer studies focus on weight as an outcome and correlate pounds lost with cancer risk. But Friedenreich wanted to specifically tease apart what physiologic effects exercise has on the body, specifically on fat (since fat levels are associated with a higher risk of a number of cancers, including breast cancer).

So how much exercise did they conclude you need to do each week?

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The study found that doing between 150 and 300 minutes of exercise a week will significantly decrease your breast cancer risk

While the women who exercised more saw the biggest drops in their body fat measures, those who followed the recommended amount of activity, 150 minutes each week, also melted away some of their fat. But the finding suggests that more is better, and for preventing cancer, it may take more than the recommended amount of exercise to produce a benefit.
 
“The exercise guidelines were developed with heart disease outcomes in mind,” says Friedenreich. “So at that level, they can have an effect on blood pressure, cholesterol levels and waist circumference. But for cancer prevention, we may need to exercise at higher volumes. So yes, doing 150 minutes of activity a week is good, but if you can do more, then from a cancer prevention perspective, 300 minutes is better.”
 
The fact that exercise can lead to a drop in body fat is especially important for cancer of the breast, she says. This is because fatty tissue is the primary source of hormones that can drive breast cancer after menopause. Fat also plays a role in your body’s immune and inflammatory responses, both of which are also involved in cancer. “I’m sure that doctors are advising their patients to be more physically active to prevent heart disease or diabetes,” says Friedenreich. “So we’d like to add cancer to that list of chronic diseases that exercise can potentially prevent or help to lower the risk.”

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