- A meta-analysis finds that healthy diets are associated with 7% lower risk of breast cancer and 24% lower risk of all-cause mortality in patients with breast cancer.
- No association is seen between healthy diets and lower risk of breast cancer-specific mortality.
Why this matters
- Results suggest that clinicians should promote healthy diet for breast cancer prevention and, if breast cancer is present, for all-cause survival.
- Meta-analysis of prospective cohort studies (n=32) probing the association between breast cancer risk (n=27) and mortality in patients with breast cancer (n=5).
- Healthy diets were classified by author's description.
- Funding: None disclosed.
- Healthy diets were associated with slightly lower risk of breast cancer onset (risk ratio [RR], 0.93; 95% CI, 0.88-0.98).
- Subgroup analysis found breast cancer risk reduction with a posteriori-derived healthy patterns (RR, 0.90; 95% CI, 0.85-0.95) but not a priori diet, study region, menopausal status, or breast cancer subtypes.
- Healthy diets were associated with lower risk of all-cause mortality in patients with breast cancer (RR, 0.76; 95% CI, 0.63-0.92), but not in their breast cancer-specific mortality (RR, 0.91; 95% CI, 0.65-1.28).
- Heterogeneity across studies, especially in definition of healthy diet.