Saturated Fat

Avoid

2 studies · 1 recommendation

Last updated: February 25, 2026

Avoid2 studies

High saturated fat intake linked to increased breast cancer risk and mortality

Two studies—a prospective cohort and a systematic review—consistently associate higher saturated fat consumption with elevated breast cancer risk and poorer survival outcomes. In the cohort study of 4,441 women with invasive breast cancer, those in the highest quintile of saturated fat intake faced 41% greater all-cause mortality compared to the lowest quintile (HR = 1.41, 95% CI = 1.06–1.87, P trend = 0.03) over 7 years of follow-up. The systematic review, covering epidemiological evidence from 1990–2003 across multiple populations and study designs, reinforced a positive association between saturated fat intake and breast cancer development. While individual study magnitudes varied, the aggregate evidence consistently points toward reducing saturated fat as a practical dietary strategy for lowering breast cancer risk and improving post-diagnosis survival.

Evidence

Post-diagnosis dietary factors and survival after invasive breast cancer.

Authors: Beasley, Jeannette M, Bersch, Andrew J, Egan, Kathleen M, Hampton, John M, Holick, Crystal N, Holmes, Michelle D, Newcomb, Polly A, Passarelli, Michael N, Titus-Ernstoff, Linda, Trentham-Dietz, Amy, Willett, Walter C

Published: July 1, 2011

A prospective cohort study of 4,441 women diagnosed with invasive breast cancer (ages 20-79, diagnosed 1987-1999) assessed post-diagnosis diet via a 126-item food frequency questionnaire. Over 7 years of follow-up, 137 women died from breast cancer. After adjusting for age, menopausal status, smoking, cancer stage, BMI, physical activity, and treatment, women in the highest versus lowest quintile of saturated fat intake had a significantly higher risk of all-cause mortality (HR = 1.41, 95% CI = 1.06-1.87, P trend = 0.03). Similar trends were observed for breast cancer-specific survival, though these did not reach statistical significance.

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Dietary fat and risk of breast cancer

Authors: Binukumar, Bhaskarapillai, Mathew, Aleyamma

Published: January 1, 2005

A systematic review of epidemiological studies (case-control and cohort designs) published from January 1990 through December 2003 identified a positive association between increased consumption of total fat and saturated fat and breast cancer development. The review synthesized multiple studies across different populations, consistently finding that higher saturated fat intake was positively associated with breast cancer risk. While the authors note not all individual studies showed strong positive associations, the overall body of evidence supports at least a moderate association between saturated fat consumption and increased breast cancer risk.

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