Olive oil & health

Olive oil is the one food at the heart of the world's most-studied healthy diet — and, unusually for a "superfood," the science largely backs up the reputation. Here is a measured, evidence-based look at why extra virgin olive oil is good for you, what the key compounds are and what the research does — and doesn't — show.

The Mediterranean diet, in a bottle

For decades, researchers have noted that people around the Mediterranean, who cook almost everything in olive oil, enjoy strikingly low rates of heart disease. Olive oil is the defining fat of the Mediterranean diet, and untangling its role has become one of the richest fields in nutrition science.

The compounds that matter

Good extra virgin olive oil is far more than fat. Its benefits come from three things:

• Monounsaturated fat (oleic acid). Olive oil is 55–83% oleic acid, a monounsaturated fat associated with healthier blood cholesterol when it replaces saturated or trans fats.
• Polyphenols — chiefly hydroxytyrosol, tyrosol and oleuropein. These are powerful antioxidants, concentrated in fresh extra virgin oil and largely stripped out of refined "light" oils. They are what make a good oil taste bitter and green.
• Oleocanthal — the compound responsible for the peppery sting at the back of your throat. In a landmark 2005 study in Nature, researchers showed that oleocanthal inhibits the same COX enzymes as ibuprofen — the mechanism behind that drug's anti-inflammatory effect. A daily 50 g of good EVOO supplies a modest but real dose. (It is a food, not a medicine — but a genuinely anti-inflammatory one.)

This is why quality matters: the peppery, bitter, early-harvest oils richest in flavour are also the richest in these healthful compounds. (See How to Taste Olive Oil.)

What the research shows

• The EU health claim. European law permits one official claim for olive-oil polyphenols: they "contribute to the protection of blood lipids from oxidative stress." To carry it, an oil must contain at least 5 mg of hydroxytyrosol and its derivatives per 20 g — a threshold many cheap oils never reach, but good EVOO does.
• The PREDIMED trial. This large Spanish study followed thousands of people at high cardiovascular risk and found that a Mediterranean diet supplemented with extra virgin olive oil cut the rate of major cardiovascular events (heart attack, stroke, cardiovascular death) by roughly 30% compared with a low-fat diet. (The original paper was retracted over a randomisation flaw and then re-published in 2018 with corrected methods; the main conclusion held.)

A fair reading: olive oil, as part of a whole Mediterranean pattern, is strongly associated with better heart health. It supports health; it is not a cure, and no single food works magic on its own.

Is it safe to cook with?

Yes — despite a persistent myth. Extra virgin olive oil has a smoke point around 210 °C, well above normal frying temperature (~180 °C), and its true advantage is oxidative stability: its monounsaturated fat and antioxidants make it one of the safest oils to heat. Much of its polyphenol content survives cooking. Frying in olive oil is a Mediterranean tradition for good reason. (See Buying, Storing & Cooking with Olive Oil.)

A daily ritual worth keeping

Two tablespoons (about 20 g) of good extra virgin olive oil a day — over salad, bread, vegetables or fish — is the simplest way to bring this into your life. On a stay at Cortijo Bujio, with the local Poniente de Granada oil on the table, it is also one of the most delicious. (See olive oil around Montefrío.)

Frequently asked questions

Is olive oil actually good for you?

The evidence is strong that extra virgin olive oil, as part of a Mediterranean diet, is associated with better heart health. Its monounsaturated fat, polyphenols and oleocanthal are the compounds behind the benefits.

What is oleocanthal?

The polyphenol that gives fresh olive oil its peppery throat-sting. A 2005 Nature study showed it has ibuprofen-like anti-inflammatory activity, inhibiting the same COX enzymes — in modest, food-level amounts.

Does cooking destroy the health benefits?

No — extra virgin olive oil is stable and safe to cook with, even to fry, and much of its polyphenol content survives. Its smoke point is comfortably above frying temperature.

How much should I have a day?

Around 20 g (about two tablespoons) of good extra virgin olive oil daily is the amount linked to benefits and used in the EU polyphenol health claim.

This article is general information, not medical advice.

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Cortijo Bujio puts local olive oil on your table. Read on: How to Taste Olive Oil, How Olive Oil Is Made and Buying, Storing & Cooking.

Sources: Beauchamp et al., Nature (2005), "Ibuprofen-like activity in extra-virgin olive oil"; Commission Regulation (EU) No 432/2012; PREDIMED (NEJM 2018 republication); UC Davis Olive Center.

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