Omega-3 Fatty Acids

Suggested

2 studies · 1 recommendation

Last updated: February 25, 2026

Suggested2 studies

Higher omega-3 to omega-6 ratio linked to reduced breast cancer risk

Two studies—a multicenter case-control study and a systematic review—support an inverse association between omega-3 fatty acid intake and breast cancer risk. The EURAMIC case-control study across five European countries measured adipose tissue fatty acid composition in postmenopausal women and found that a higher ratio of long-chain omega-3 to omega-6 fatty acids was associated with lower breast cancer odds, with the strongest effect observed in Malaga, Spain (OR 0.32, 95% CI 0.13–0.82 for the highest tertile). Pooled odds ratios across all centers were 0.80 and 0.65 for the second and third tertiles, respectively (p for trend = 0.055). A systematic review covering epidemiological studies from 1990–2003 corroborated this pattern, identifying a moderate inverse association between n-3 fatty acid consumption and breast cancer risk, while n-6 intake showed a moderate positive association. Prioritizing dietary omega-3 sources over omega-6-rich foods may offer a protective benefit.

Evidence

Adipose Tissue Omega-3 and Omega-6 Fatty Acid Content and Breast Cancer in the EURAMIC Study

Authors: Huttunen, Jussi K., Kardinaal, Alwine F. M., Kohlmeier, Lenore, Kok, Frans J., Martin, Blaise C., Martin-Moreno, José M., Navajas, Joaquin Femández-Crehuet, Simonsen, Neal, Strain, John J., Thamm, Michael, Veer, Pieter van't

Published: August 2, 2017

In this multicenter case-control study across five European countries (EURAMIC, 1991-1992), adipose tissue fatty acid composition was measured in postmenopausal breast cancer cases and controls. The ratio of long-chain omega-3 fatty acids to total omega-6 fat showed an inverse association with breast cancer in four of five centers. In Malaga, Spain, the odds ratio for the highest tertile versus lowest was 0.32 (95% CI 0.13-0.82). Pooled across all centers, odds ratios were 0.80 for the second tertile and 0.65 for the third tertile, with a downward trend approaching statistical significance (p for trend = 0.055).

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Dietary fat and risk of breast cancer

Authors: Binukumar, Bhaskarapillai, Mathew, Aleyamma

Published: January 1, 2005

A systematic review of case-control and cohort studies spanning January 1990 through December 2003 found a moderate inverse association between consumption of n-3 fatty acids and breast cancer risk. In contrast, n-6 fatty acid intake showed a moderate positive association with breast cancer risk. The review encompassed multiple epidemiological studies across diverse populations, with the compiled evidence supporting that higher omega-3 intake relative to omega-6 may confer a protective effect against breast cancer development.

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