New research suggests that age-specific advice could improve efforts to reduce breast cancer risk by targeting the lifestyle factors most relevant at different stages of a woman’s life. The study, involving data from over 110,000 women in the Breast Cancer Now Generations Study, highlights that interventions addressing alcohol consumption and body weight may be particularly effective when timed according to life stages.

Experts estimate that around 25% of breast cancer cases could be prevented through lifestyle modifications such as increased physical activity, maintaining a healthy weight, and reducing alcohol intake. The latest findings, published in the journal Scientific Reports, underscore the importance of tailoring risk-reduction messages to women’s changing habits and vulnerabilities over time.

Researchers found that adolescence and early adulthood, including the teenage years and early 20s, are critical periods for encouraging physical activity and preventing rapid weight gain, as these years see peaks in smoking, drinking, and exercise behaviors. Women in their 20s tend to consume more alcohol than other age groups, yet the cumulative risks associated with drinking and excess body fat become more pronounced in the 30s and 40s. In this mid-life period, body mass index (BMI) often increases steadily, while alcohol consumption may rise again.

Alcohol and excess fat both influence estrogen levels, which play a role in the development of breast cancer. The study notes that just one glass of wine per night—a typical serving equating to one to two units of alcohol—can increase breast cancer risk by approximately 15%. Additionally, obesity, particularly after menopause, is associated with a roughly 30% higher risk of breast cancer compared to non-obese women.

Professor Marc Gunter of Imperial College London, the study’s lead author, emphasized the need for health messaging that reflects these age-related patterns. “Adolescence and early adulthood may be a particularly important time to encourage physical activity and help prevent rapid weight gain," he said. He also highlighted early to mid-adulthood, roughly from the 30s to 50s, as a key phase to address increasing BMI and alcohol consumption.

Professor Amy Berrington from The Institute of Cancer Research added that warning women about alcohol-related risks at specific ages might also aid in preventing other diseases, such as diabetes and cardiovascular conditions.

The research comes amid concerns about rising breast cancer rates among younger women, with cases increasing by nearly 10% among those aged 20 to 49 over the past decade. By aligning preventive advice with life stages, health experts hope to improve uptake of healthy behaviors and ultimately reduce breast cancer incidence.