A detailed large-scale study of a group of Danish researchers has found that there is no relationship between physical activity and breast density. Their authors point out that their findings imply that the protective effect of physical activity on breast cancer could be through other mechanisms other than breast density.

It is known that women whose breasts are denser have a higher risk of developing breast cancer than those with lower density of the breast and physical activity have a protective effect against the disease, but studies on the relationship between physical activity and The density of the breast have yielded inconsistent results to date. More information