Eating too much omega-6 fat—especially from vegetable oils and meat from grain-fed animals—might increase body-wide inflammation, which could lead to long-term health problems like heart disease or diabetes.
Evidence from Studies
Supporting (2)
Community contributions welcome
Linoleic acid induces human ovarian granulosa cell inflammation and apoptosis through the ER-FOXO1-ROS-NFκB pathway
The study shows that linoleic acid can cause inflammation in ovary cells in a lab dish, which supports the idea that too much of it might be harmful, but it doesn’t prove this happens in the whole body from diet.
Seed Oils as a Hypothesized Contributor to Heart Disease: A Narrative Synthesis.
The study looks at the same type of fats (like those in vegetable oils) and finds they may increase inflammation and heart disease, which supports the idea that eating too much of these fats can be harmful.
Contradicting (2)
Community contributions welcome
Red Blood Cell Omega-6 Fatty Acids and Biomarkers of Inflammation in the Framingham Offspring Study
The study found that people with more omega-6 fats in their blood actually had less inflammation, not more. This goes against the idea that these fats cause harmful inflammation.
Habitual Dietary Intake of n-3 and n-6 Fatty Acids in Relation to Inflammatory Markers Among US Men and Women
The study found that eating more omega-6 fats didn’t increase inflammation, and actually worked well with omega-3s to reduce it, which goes against the idea that omega-6s are harmful.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.