New Research Reveals Morning Exercise May Significantly Reduce Breast Cancer Risk in Postmenopausal Women
UNITED STATES – A groundbreaking study published Wednesday in the Journal of Clinical Oncology has found that postmenopausal women who engage in moderate-to-vigorous physical activity during the morning hours may reduce their risk of developing breast cancer by up to 25 percent. Researchers from the National Institutes of Health analyzed data from over 50,000 women aged 50 to 79 over a 15-year period, measuring their physical activity patterns and subsequent breast cancer diagnoses. The study specifically linked morning exercise, defined as activity between 7 a.m. and 11 a.m., to lower estrogen levels and improved immune function, both protective factors against the disease. Experts emphasize this is an observational finding and does not establish causation, but it adds to growing evidence that exercise timing may influence health outcomes. The International Agency for Research on Cancer also noted the importance of these results for public health guidelines. The report highlights that breast cancer remains the second most common cancer among women globally, with over 2.3 million new cases diagnosed in 2022.