Study links red meat, smoking and high blood sugar to breast cancer risk
A large analysis by Washington University researchers identified six lifestyle factors that together account for a substantial share of breast-cancer-related health loss.
Researchers at Washington University conducted a comprehensive analysis that pinpointed six lifestyle elements influencing breast cancer outcomes. Red meat intake emerged as the leading contributor, with smoking, secondhand smoke, high blood sugar, overweight, alcohol consumption, and insufficient exercise also playing notable roles. Combined, these factors are linked to over one-quarter of the disease’s impact on healthy life expectancy.
The authors stress that reducing smoking and alcohol use, limiting red meat, staying active and maintaining a healthy weight can lower risk, whereas managing high blood sugar may need clinical intervention. The analysis also acknowledges genetic and other non-modifiable causes, emphasizing that lifestyle changes alone cannot prevent all cases. The findings were published in The Lancet Oncology in March 2026.
