Use extra-virgin olive oil as your primary fat

Extra-virgin olive oil is the most evidence-backed single food for anti-inflammatory effects.

Why it works

Extra-virgin olive oil (EVOO) contains oleocanthal, a polyphenol that inhibits cyclooxygenase enzymes (COX-1 and COX-2) — the same enzymes blocked by ibuprofen. Unlike refined olive oil, EVOO retains these polyphenols because it is cold-pressed. Oleic acid in EVOO also shifts the omega-6:omega-3 ratio favorably by replacing pro-inflammatory linoleic acid from seed oils. Both mechanisms are anti-neuroinflammatory.

How to do it

1. Replace butter, margarine, and seed oils with EVOO for cold use (dressings, drizzling over food).
2. Use EVOO for low-to-medium-heat cooking; its smoke point (~190–207°C) is adequate for sautéing.
3. Buy extra-virgin on the label — not "pure olive oil" or "light olive oil," which are refined and lack polyphenols.
4. Look for harvest dates within the last 18 months; polyphenol content degrades with age and light exposure.

Evidence

EVOO polyphenols, particularly oleocanthal, show COX-inhibitory activity in vitro. The PREDIMED trial found that a Mediterranean diet supplemented with EVOO reduced cardiovascular events, with anti-inflammatory biomarker improvements. (rct)

PREDIMED studied cardiovascular endpoints primarily; mood-specific EVOO effects are a downstream inference from the anti-inflammatory mechanism.

Sources

• Estruch et al. (2013/2018), Primary prevention of cardiovascular disease with a Mediterranean diet (PREDIMED), New England Journal of Medicine

Common mistake

Buying olive oil in clear bottles from the supermarket without checking freshness — old, light-exposed olive oil has degraded polyphenols and may be essentially the same as refined oil for anti-inflammatory purposes.