biostudies-literatureUnknown17(13)Buja AIntroduction: Many studies have been published, but none have pooled the useful evidence available in the literature to produce guidelines and health policies promoting healthy eating styles to prevent breast cancer (BC). The present study aimed to summarize the evidence produced to date, taking a judicious, critical approach to the quality of the studies analyzed. Methods: An umbrella review method was adopted, which is a systematic review of second-level studies, meta-analyses and literature reviews. Results: In all, 48 studies were considered: 32 meta-analyses, 4 pooled analyses, 5 systematic reviews, and 7 qualitative reviews. A higher intake of total meat, or red or processed meats, or foods with a high glycemic index, or eggs would seem to be associated with a higher risk of BC. SomeInternational journal of environmental research and public healthE4731https://www.ebi.ac.uk/biostudies/studies/S-EPMC7369836biostudies-literatureBreast Cancer Primary Prevention and Diet: An Umbrella Review.PMC7369836Buja ABaldo VPierbon MLago LGrotto GfalseBreast Cancer Primary Prevention and Diet: An Umbrella Review.Introduction: Many studies have been published, but none have pooled the useful evidence available in the literature to produce guidelines and health policies promoting healthy eating styles to prevent breast cancer (BC). The present study aimed to summarize the evidence produced to date, taking a judicious, critical approach to the quality of the studies analyzed. Methods: An umbrella review method was adopted, which is a systematic review of second-level studies, meta-analyses and literature reviews. Results: In all, 48 studies were considered: 32 meta-analyses, 4 pooled analyses, 5 systematic reviews, and 7 qualitative reviews. A higher intake of total meat, or red or processed meats, or foods with a high glycemic index, or eggs would seem to be associated with a higher risk of BC. Some2020-01-01T00:00:00Z2020 Jul2025-04-22T19:30:17.604Z2025-04-06T02:48:17.854ZS-EPMC73698363263021510.3390/ijerph17134731