• Inmaculada Aguilera-Buenosvinos, Miguel Ángel Martínez-González, Itziar Zazpe, Andrea Romanos-Nanclares, Rodrigo Sánchez-Bayona, and Estefanía Toledo.
• University of Navarra, Department of Preventive Medicine and Public Health, Pamplona, Spain; Navarra Institute for Health Research, IdiSNA, Pamplona, Spain.
• Nutrition. 2023 May 1; 109: 111967111967.

ObjectivesDietary patterns may have a greater influence on human health than individual foods or nutrients, and they are also of substantial interest in the field of breast cancer prevention. Beyond the adequate balance of macronutrients, evidence indicates that the quality of macronutrient sources may play an important role in health outcomes. We sought to examine the relationship between healthful and unhealthful low-fat dietary patterns in relation to breast cancer.MethodsWe used observational data from a Mediterranean cohort study (the Seguimiento Universidad de Navarra project). We prospectively followed 10 930 middle-aged women initially free of breast cancer during a median follow-up of 12.1 y. We calculated an overall, an unhealthful, and a healthful low-fat diet score, based on a previously validated 136-item food frequency questionnaire and grouped participants into tertiles. Incident breast cancer-overall and stratified by menopausal status-was the primary outcome. It was self-reported by participants and confirmed based on medical reports or consultation of the National Death Index. We used multivariable Cox regression models adjusted for potential confounders.ResultsDuring 123 297 person-years of follow-up, 150 cases of incident breast cancer were confirmed. No significant associations were observed for overall or premenopausal breast cancer. For postmenopausal women, we observed a significant association for moderate adherence to the unhealthful low-fat dietary score and postmenopausal breast cancer (comparing tertile 2 to tertile 1; hazard ratio = 2.18; 95% confidence interval, 1.15-4.13).ConclusionsIn conclusion, no clear associations were observed, although more research is needed to address the association between an unhealthful dietary pattern and postmenopausal breast cancer risk.Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.

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