Eating too many seed oils makes your body cells get damaged and causes silent body-wide swelling that hurts you over time.
Evidence from Studies
Supporting (3)
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When people took high doses of fish oil (rich in omega-3 fats) for a long time, their blood cell membranes became more prone to damage from oxidation — which is a key step that can lead to long-term body-wide inflammation.
The study found that feeding mice fish oil (a type of healthy fat) made their cells more prone to a type of damage called lipid peroxidation, which the claim says causes inflammation. Even though the study didn’t measure overall body inflammation, it did show the key first step the claim talks about happens — so it supports the idea.
The study shows that eating certain healthy oils (like fish or seed oils) causes harmful chemical reactions in cancer cells that kill them — and those reactions are the same ones the claim says cause long-term body-wide inflammation. So yes, the oils do cause the damage described, just in tumors instead of everywhere.
Contradicting (2)
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This study gave people extra soybean oil for a month and checked if it made their body more inflamed — it didn’t. In fact, some signs of inflammation went down, which means the claim that seed oils cause inflammation is probably wrong.
The study found that eating more seed oils didn’t cause more cell damage unless the rats didn’t get enough vitamin E — so it’s not the oils alone that cause harm, but lack of antioxidants.