1472 / 1983
Factor
% of breast cancers attributable to lifestyle risk
factor that might be modified
Alcohol
6
Overweight and obesity
9
Physical exercise
3
Post-menopausal hormones
3
Ionizing radiation
1
Occupation
5
Reproduction (breast-feeding)
3
Total
27
Parkin et al Br J Cancer 2011;105(S2):S77-S81
Lifestyle factors which might be modified to
reduce breast cancer incidence in the UK
This is the theoretical maximum amount. Realistically, not all this could be achieved.
So lifestyle changes can only make a modest contribution to reduction in breast cancer.