Olive oil facts
Extra virgin, virgin, ‘pure’, ‘light’, pomace: the olive-oil aisle is a thicket of grades and claims. Most of it comes down to a few clear ideas — and a couple of persistent myths worth clearing up before you buy.
Olive oil is really just fruit juice — the juice of pressed olives — and that one fact explains most of what matters. Because it is a fresh juice, it is graded by how carefully it was made and how little it has been meddled with, and it fades with age rather than lasting indefinitely. Get the grades straight and the shelf stops being a mystery. Here is the plain version, with the tired half-truths pulled out.
The grades, plainly
Extra virgin is the top grade: oil from the first mechanical pressing, made without heat or chemicals, with the lowest acidity and the fullest, fruitiest flavour — and the highest price. Virgin is the same idea, a step down in quality. Plain ‘olive oil’ (once called ‘pure’) is refined oil blended with a little virgin for flavour. ‘Light’ oil is the great misunderstanding: it is not lower in calories, it is simply refined so heavily that colour, aroma and flavour are stripped out, leaving a bland oil with a higher smoke point. Pomace oil is extracted from the leftover pulp with solvents and refined — the bottom of the range.
| Grade | What it is | Best for |
|---|---|---|
| Extra virgin | First press, no heat/chemicals, lowest acidity | Raw — finishing, dressings, dipping |
| Virgin | Same process, a step lower in quality | Everyday raw and light cooking |
| ‘Olive oil’ / ‘pure’ | Refined oil with a little virgin added | General cooking |
| ‘Light’ | Heavily refined, flavour stripped, higher smoke point | High-heat frying |
| Pomace | Solvent-extracted from pulp, then refined | Cheap high-heat cooking |
The myths worth dropping
A few ‘facts’ deserve retiring. ‘Light’ does not mean fewer calories — every olive oil has essentially the same fat per spoon; it means stripped of flavour. Colour is not a quality guide either: a green oil can be poor and a golden one excellent, because colour reflects the olives and ripeness, not grade. And a ‘buttery’, soft, characterless oil is often not a mild style but a rancid one — real extra virgin should smell alive. For the whole story behind the top grade, read what ‘extra virgin’ really means.
Keeping it fresh
Because it is juice, olive oil has three enemies — air, heat and light — and they turn it rancid over time. Keep the bottle tightly sealed, cool and out of the light, and use it within a few months of opening. Refrigeration does not ruin most grades but is not ideal for extra virgin, where condensation can form in the bottle. Buy dark glass or tin, buy dated, and buy only what you will actually use while it is fresh.
- Extra virgin for raw, a refined grade for high-heat frying.
- ‘Light’ is not low-calorie — it just has no flavour.
- Colour tells you nothing about quality; taste and smell do.
- Store cool, dark and sealed, and finish it fresh.
Olive oil grades: common questions
What does ‘extra virgin’ mean?
Oil from the first mechanical pressing, made without heat or chemicals, with the lowest acidity and the fullest flavour. It is the top grade and best used raw.
Is ‘light’ olive oil lower in calories?
No. It has the same fat and calories as any olive oil. ‘Light’ refers to filtered-out colour and flavour, giving a blander oil with a higher smoke point for frying.
Does the colour tell me if olive oil is good?
No. Colour depends on the olives and their ripeness, not the grade. A green oil can be mediocre and a golden one excellent — judge by smell and taste.
Can I cook with extra virgin olive oil?
You can, but its flavour and price are wasted on high heat. Keep extra virgin for raw uses and a cheaper refined grade for frying.
How should I store olive oil?
Sealed, cool and dark. Air, heat and light turn it rancid, so keep it away from the stove and use it within a few months of opening.
Two myths cause most of the confusion. ‘Light’ is not a diet word — it means an oil refined until it has no flavour, good only for frying, not fewer calories. And colour is a red herring : a deep green oil can be poor and a pale gold one superb, because colour tracks the olives, not the grade. Get those two straight, keep extra virgin for raw use and a humble refined grade for the pan, store it cool, dark and sealed, and finish it fresh. The rest of the aisle sorts itself out.
An evergreen guide to olive-oil grades, correcting the common back-of-bottle myths.