This summary table contains detailed information about research studies. Summary tables are a useful way to look at the science behind many breast cancer guidelines and recommendations. However, to get the most out of the tables, it’s important to understand some key concepts. Learn how to read a research table.
Introduction: Breast cancer survival rates vary from country to country. Many researchers have wondered whether these differences in survival may be due, in part, to differences in diet. Fat intake is of special interest.
Studies have looked at whether eating a low-fat diet after a breast cancer diagnosis improves survival. Findings are mixed.
Learn more about diet after a breast cancer diagnosis.
Learn more about dietary fat and breast cancer risk.
Learn about the strengths and weaknesses of different types of studies.
Study selection criteria: Randomized controlled trials and prospective cohort studies with at least 400 participants and meta-analyses.
All studies measured fat intake after breast cancer diagnosis.
Table note: Relative risk above 1 indicates increased risk. Relative risk below 1 indicates decreased risk.
Study Population(number of participants)
Was Survival Better for Breast Cancer Survivors who Ate a Low-Fat Diet Compared to Those Who Ate a High-Fat Diet? Yes / No
Randomized controlled trials
Women's Healthy Eating and Living Study 
Women's Intervention Nutrition Study 
Women's Health Initiative Dietary Modification Trial 
Prospective cohort studies
Collaborative Women’s Longevity Study 
Nurses’ Health Study 
Danish Breast Cancer Cooperative Group 
Borugian et al. 
Premenopausal women:YesPostmenopausal women:No
Rohan et al. 
Brennan et al. 
Xing et al. 
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