Background: Even though many studies have examined the possible effect of low-fat diet on breast cancersurvival, the relationship remains unclear. Objectives: To summarize the current evidence about the effect ofpost-diagnostic low-fat diet on recurrence and all-cause mortality of breast cancer. Methods: We conducted asearch of Pubmed, Embase, Web of Science, and Cochrane Library and as a result two randomized controlledtrials (RCT) and one large multi-center prospective cohort study with 9,966 breast cancer patients were includedin this report. Results: Post-diagnostic low-fat diet reduced risk of recurrence of breast cancer by 23% (HR=0.77,95%CI 0.63 to 0.94, P=0.009) and all cause mortality of breast cancer by 17% (HR=0.83, 95%CI 0.69 to 1.00,P=0.05). Conclusions: This meta-analysis suggested the post-diagnostic low-fat diet can improve breast cancersurvival by reducing risk of recurrence. However, more trials of the relationship between low-fat diet and allcausemortality of breast cancer are still needed.
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