According to a study, exercising three times a week could reduce the risk of breast cancer by almost 40 percent.
Research on more than 130,000 women found that a sedentary lifestyle was linked to a far higher risk of the disease, especially in its deadliest forms.
Scientists behind the research said it’s now clear that activity level has an impact on disease risk, independent of risks caused by other factors like obesity.
The study, published in the British Journal of Sports Medicine, found “strong evidence that higher levels of physical activity and less time sedentary are likely to reduce breast cancer risk, with results generally consistent across all breast cancer subtypes.”
Using a genetic prediction technique known as Mendelian randomization, experts said they were able to back up previous evidence that physical activity lowers cancer risk.
For the new research, scientists looked at data from 130,957 women — 69,838 of whom had tumors that had started to spread; 6,667 who had never had a tumor and a comparison group of 54,452 women without breast cancer.
They then relied on studies that tracked activity levels. The results suggest that those with the highest overall activity levels are likely to have a 40 percent lower risk of the disease, with similar results for those who did at least three sessions of vigorous exercise per week.
Researchers found that the least active women have more than double the risk of triple-negative breast cancer, one of the deadliest and most aggressive types of diseases.
dr Kotryna Temcinaite, Senior Research Communications Manager at Breast Cancer Now, said, “Maintaining a healthy weight, limiting alcohol consumption and being as active as possible can all help reduce your risk of developing the disease.”
Telegraph Media Group Limited 
https://www.independent.ie/irish-news/health/study-shows-that-exercising-may-cut-risk-of-breast-cancer-by-almost-40pc-41967454.html Study shows exercise can reduce breast cancer risk by nearly 40 percent