One reason exercise might decrease breast cancer risk is because of the increase in self-esteem. decrease in body fat. social support involved. increased metabolism.

Exercise offers a lot of advantage to our body to keep it healthy. One reason why breast cancer occurs is that there is a high level of the hormone, estrogen in the body. When you exercise, your metabolism increases, which then balances your hormonal levels. Your blood estrogen then decreases. The answer is increased metabolism.

Ithink due to shortage of water