Olive Oil Facts: Ten Things Worth Knowing

A few true things about olives and their oil that surprise almost everyone — and that, between them, tell you most of what matters about this remarkable fruit.

Olives are stranger and older than they look. Ten facts that, put together, are most of an education.

1. The olive is a fruit, and the oil is its juice

Olive oil isn’t processed or extracted with chemistry like seed oils — good oil is simply fresh fruit juice, crushed and separated. (How it’s made.)

2. Raw olives are inedible

Straight off the tree they’re punishingly bitter; every olive you’ve eaten was cured first.

3. Green and black are the same fruit

Colour is mostly ripeness, not variety — and matte-black canned olives are often dyed.

4. It takes ~5–7 kg of olives to make one litre of oil.

5. Olive trees live for centuries — sometimes millennia

Some living trees are over 2,000 years old and still fruit.

6. Spain, not Italy, makes the most oil

By a wide margin — much “Italian” oil is bottled, not grown, in Italy.

7. The peppery cough is a good sign

That throat-sting is the antioxidant polyphenols — quality, not a fault.

8. Olives grow on five continents

Not just the Mediterranean — California, South America, Australia and more.

9. “Extra virgin” is a real legal grade — that’s widely faked

A lot of it isn’t.

10. There are hundreds of varieties

From the fierce Coratina to the buttery Castelvetrano — the whole encyclopedia is here.