Which factor is NOT considered a risk factor for breast cancer?

High exercise levels are not considered a risk factor for breast cancer. In fact, engaging in regular physical activity is generally associated with a lower risk of developing various types of cancer, including breast cancer. Exercise can lead to a lower body weight and help regulate hormone levels, both of which can contribute to a reduced cancer risk.

On the other hand, genetic mutations, aging, and family history are well-established risk factors for breast cancer. Genetic mutations, such as those in the BRCA1 and BRCA2 genes, significantly increase the likelihood of developing breast cancer. Aging is another critical factor, as the risk of breast cancer increases with age due to cumulative exposures to risk factors over time. Finally, a family history of breast cancer can indicate genetic predispositions or shared environmental factors contributing to the disease.