Red Meat and Smoking Blamed for Over a Quarter of Breast Cancer's Global Health Impact
A groundbreaking global study has identified high red meat consumption and tobacco use, including exposure to second-hand smoke, as the primary lifestyle factors responsible for more than a quarter of healthy years lost to breast cancer worldwide. Published in the journal Lancet Oncology, this research represents the largest analysis of its kind, forecasting alarming trends in breast cancer incidence and mortality up to 2050.
Staggering Projections for Breast Cancer Cases and Deaths
The study utilised data from population-based cancer registries spanning from 1990 to 2023 across more than 200 countries. It predicts that new breast cancer cases globally will rise by a third, escalating from 2.3 million in 2023 to over 3.5 million by 2050. Concurrently, the annual global death toll from breast cancer is forecast to increase by 44 per cent, from 764,000 to nearly 1.4 million within the same timeframe.
Breast cancer remains the most common cancer in the UK, with approximately 55,000 women and 400 men diagnosed annually. While numerous risk factors are recognised, including alcohol consumption, obesity, and inherited genes, this study highlights red meat intake as potentially having the most significant impact on the disease's burden.
Modifiable Risk Factors and Their Contributions
In 2023, researchers estimated that 28 per cent of the global breast cancer burden, equivalent to 6.8 million years of healthy life lost to disability, illness, and premature death, was attributable to six potentially modifiable risk factors. The breakdown reveals:
- High red meat consumption had the largest impact, linked to nearly 11 per cent of all healthy life years lost.
- Tobacco use, including second-hand smoke, followed closely, accounting for 8 per cent of healthy life years lost.
- High blood sugar was responsible for 6 per cent.
- Overweight and obesity were linked to 4 per cent.
- High alcohol use and low physical activity each contributed 2 per cent.
Maintaining a healthy lifestyle—such as abstaining from smoking, engaging in regular exercise, reducing red meat intake, and achieving a healthy weight—could prevent more than a quarter of the healthy years lost to breast cancer globally.
Disparities in Global Breast Cancer Burden
Lead author Kayleigh Bhangdia from the Institute for Health Metrics and Evaluation at the University of Washington emphasised the profound toll breast cancer exacts on women's lives and communities. She noted that while high-income countries often benefit from advanced screening, timely diagnosis, and comprehensive treatment, the burden is shifting to low- and lower-middle-income countries.
In these regions, individuals frequently face later-stage diagnoses, limited access to quality care, and higher death rates, threatening to undermine progress in women's health. Data reveals that although women in low- and lower-middle-income countries account for only 27 per cent (around 628,000) of new global cases, they contribute to more than 45 per cent of all ill-health and early deaths from breast cancer. This disparity translates to nearly 11 million years of healthy life lost.
Age-Related Trends and Healthy Life Years Lost
The study also uncovered significant age-related trends. In 2023, three times as many new breast cancer cases were diagnosed in women aged 55 or older globally compared to those aged 20 to 54. However, rates of new cases in women aged 20 to 54 have risen by nearly a third since 1990, whereas rates in older women have not changed substantially.
Globally, the number of years of healthy life lost due to poor health and early death from breast cancer more than doubled from 11.7 million years in 1990 to 24 million years in 2023. This metric, which accounts for illness, disability, and premature death, underscores the escalating impact of the disease on women's wellbeing worldwide.
The findings underscore the critical need for targeted public health interventions and lifestyle modifications to mitigate the rising burden of breast cancer, particularly in vulnerable populations.
