Diet
Avoiding Seed Oils for Skin
No controlled evidence links seed oil intake to acne, ageing or inflammation in humans. People who cut them usually also cut fried food — that is the variable that moved.
Also called: no seed oils · vegetable oil free · linoleic acid bad
Verdict — cope
The mechanism does not hold. Your time is better spent elsewhere.
Evidence grade B
At least one good randomised trial, or consistent findings across controlled studies.
Mechanism
The claim is that linoleic acid drives systemic inflammation via arachidonic acid. Controlled feeding trials show increasing dietary linoleic acid does not raise circulating inflammatory markers in humans.
Citations
- Effect of dietary linoleic acid on markers of inflammation in healthy persons: a systematic review of randomized controlled trialsJournal of the Academy of Nutrition and Dietetics · 2012
- The effect of a low glycemic load diet on acne vulgaris: a randomized controlled trialAmerican Journal of Clinical Nutrition · 2007
The full read
The strongest version of the argument is mechanistic and stops at the cell; the human feeding trials that tested it found no inflammatory signal, and a systematic review of thirty of them says so directly. What genuinely does track with skin is glycaemic load and, for some people, dairy — and 'no seed oils' in practice means no chips, no takeaway and no ultra-processed snacks, which moves both of those. Keep the behaviour change if it is working for you; do not credit the oil. The one real point in the neighbourhood is that repeatedly reheated frying oil is an unpleasant food, which is not a claim about linoleic acid.
