Research
Hormonal
A lower omega-6 to omega-3 ratio (specifically 2.5:1) reduces rectal cell proliferation in patients with colorectal cancer, whereas a ratio of 4:1 with the same amount of omega-3s had no effect.
If managing colorectal cancer risk, aim for a very low omega-6 to omega-3 ratio (around 2.5:1). This requires significantly reducing seed oils (corn, soy, sunflower) while increasing omega-3 sources. Simply taking fish oil pills without changing your background fat intake may not provide the same anti-proliferative benefits.
GoodQualifiesHIGH confidence
A ratio of 2.5/1 reduced rectal cell proliferation in patients with colorectal cancer, whereas a ratio of 4/1 with the same amount of omega-3 PUFA had no effect.
Why this rating
Based on human studies (Bartram et al.) showing specific anti-proliferative effects at specific ratios.
Source
Omega-6/Omega-3 Essential Fatty Acid Ratio and Chronic Diseases
Artemis P. Simopoulos · Food Reviews International · 2004
DOI 10.1081/fri-120028831
narrative_reviewCited 512×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Reducing the dietary omega-6 to omega-3 fatty acid ratio from typical Western levels (15:1) to 4:1 or lower significantly reduces total mortality and cardiovascular disease risk.Good
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