. NEW DELHI: Disrupted sleep, rising stress levels and central obesity are emerging as major drivers of India’s growing breast cancer burden, which is projected to rise by 5.6% annually and add nearly 50,000 new cases every year, according to a major new study by the ICMR-National Centre for Disease Informatics and Research.The systematic review and meta-analysis analysed Indian studies published up to Dec 22, 2024, to identify population-specific risk factors. Of nearly 1,900 scientific papers screened, 31 observational studies of moderate to high quality were included.Among lifestyle-related factors, individual studies showed a positive association between breast cancer risk and poor sleep quality, irregular sleep patterns, sleeping in illuminated rooms and high stress levels – reflecting the impact of urbanisation and changing work-life patterns. Regular physical activity, the researchers noted, was consistently associated with a lower risk.Central obesity was identified as a critical factor, with women having a waist-to-hip ratio of 0.85 or higher facing significantly elevated risk. Abdominal fat, researchers noted, plays a more decisive role than overall body weight, particularly among postmenopausal women.Clinicians say these lifestyle shifts are increasingly shaping breast cancer patterns in India. Dr Samit Purohit, director of medical oncology at Action Cancer Hospital, said breast cancer is no longer driven only by age or inherited risk. “Disrupted sleep cycles, chronic stress and central obesity are becoming silent but powerful contributors, as they alter hormonal balance, immune surveillance and inflammatory pathways,” he said, adding that irregular sleep suppresses melatonin-a hormone with protective anti-cancer properties-while chronic stress leads to sustained cortisol elevation and metabolic dysfunction.The meta-analysis also found strong links with reproductive and hormonal factors, including late menopause (after 50 years), delayed first pregnancy or childbirth (after 30), multiple abortions and higher age at marriage, all of which increase lifetime hormonal exposure. Family history of cancer, particularly breast cancer, emerged as one of the strongest predictors of risk.Researchers noted India’s breast cancer risk profile differs from Western populations, where hormone replacement therapy and early menarche are dominant factors. In India, the convergence of lifestyle disruption, reproductive delay and metabolic risk is reshaping disease patterns. The study called for large, population-based prospective cohort studies and stronger emphasis on prevention and early screening.About the AuthorAnuja JaiswalAnuja Jaiswal is a Senior Assistant Editor at The Times of India, with an impressive 18-year career in narrative journalism. She specializes in health and heritage reporting, expertly simplifying complex health information to make it engaging and understandable for readers. Her deep dives into heritage topics are well-researched, resulting in captivating narratives that resonate with her audience. Over the years, she has worked in Chandigarh, Chhattisgarh and West UP, gaining diverse on-ground experience that shapes her storytelling.Read MoreEnd of ArticleFollow Us On Social MediaVideosNew Video Reveals Final Moments of Hindu Man Dipu Before Lynching in BangladeshIndians Trapped By H-1B Renewal Chaos As US VP JD Vance Defends Visa Curbs As Christian PoliticsEx-TMC MLA Humayun Kabir Launches New Party, Targets Mamata Banerjee Ahead of PollsMuhammad Yunus Interim Rule Sparks Alarm, Indian Diplomats Back Hasina On Anti India Narrative ShiftYogi Adityanath Says Vande Mataram Became Victim of Congress Appeasement PoliticsNew Zealand India FTA Sparks Coalition Rift As PM Christopher Luxon Backs Deal, NZ First Rejects ItGujarat Student Says He Was Forced To Fight For Russia As Indians Remain Trapped Ukraine War CrisisPTI Leaders Hold Massive Protest in Peshawar Against Imran Khan’s 17-Year Jail SentenceBangladesh Turmoil: Another Youth Leader Shot In Head Days After Osman Hadi’s KillingAravalli Hills Row: Why Definition Battle Could Decide Mining Water Security And AQI In North India123PhotostoriesShin Min-Ah weds Kim Woo-Bin: Shin Min-Ah stuns in the most stunning bridal gown ever! 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NEW DELHI: Disrupted sleep, rising stress levels and central obesity are emerging as major drivers of India’s growing breast cancer burden, which is projected to rise by 5.6% annually and add nearly 50,000 new cases every year, according to a major new study by the ICMR-National Centre for Disease Informatics and Research.The systematic review and meta-analysis analysed Indian studies published up to Dec 22, 2024, to identify population-specific risk factors. Of nearly 1,900 scientific papers screened, 31 observational studies of moderate to high quality were included.Among lifestyle-related factors, individual studies showed a positive association between breast cancer risk and poor sleep quality, irregular sleep patterns, sleeping in illuminated rooms and high stress levels – reflecting the impact of urbanisation and changing work-life patterns. Regular physical activity, the researchers noted, was consistently associated with a lower risk.Central obesity was identified as a critical factor, with women having a waist-to-hip ratio of 0.85 or higher facing significantly elevated risk. Abdominal fat, researchers noted, plays a more decisive role than overall body weight, particularly among postmenopausal women.Clinicians say these lifestyle shifts are increasingly shaping breast cancer patterns in India. Dr Samit Purohit, director of medical oncology at Action Cancer Hospital, said breast cancer is no longer driven only by age or inherited risk. “Disrupted sleep cycles, chronic stress and central obesity are becoming silent but powerful contributors, as they alter hormonal balance, immune surveillance and inflammatory pathways,” he said, adding that irregular sleep suppresses melatonin-a hormone with protective anti-cancer properties-while chronic stress leads to sustained cortisol elevation and metabolic dysfunction.The meta-analysis also found strong links with reproductive and hormonal factors, including late menopause (after 50 years), delayed first pregnancy or childbirth (after 30), multiple abortions and higher age at marriage, all of which increase lifetime hormonal exposure. Family history of cancer, particularly breast cancer, emerged as one of the strongest predictors of risk.Researchers noted India’s breast cancer risk profile differs from Western populations, where hormone replacement therapy and early menarche are dominant factors. In India, the convergence of lifestyle disruption, reproductive delay and metabolic risk is reshaping disease patterns. The study called for large, population-based prospective cohort studies and stronger emphasis on prevention and early screening.
