How to Choose Olive Oil

Healthful consumers want to know, but can often be confused by, how to choose olive oil.

Extra-virgin and virgin olive oil’s healthful properties come from rich levels of monounsaturated fat, which promote "good" cholesterol, as well as abundant polyphenols, powerful antioxidants that may help prevent cardiovascular disease and lower blood pressure.

But when confronted with dozens of olive oils at the grocery store, labeled with terms like "cold-pressed" and "unfiltered" on their labels—and priced from $5 to $50, what’s a grocery shopper to do?

General Shopping Tips for Buying Olive Oil

Light exposure causes the oil to become rancid and lose its healthful properties—buy extra-virgin olive oil in dark glass bottles and metal cans and store it in a cool, dark place.

Bottling and/or expiration dates provide guidance on how long the oil will keep.

If you don’t use extra-virgin olive oil regularly, buy smallbottles—polyphenols and flavor can diminish as the oil is exposed to air.

The color of the oil doesn’t indicate its quality—rather the variety andripeness of olives used to make it.

Here’s what to look for when you shop for olive oil.

"Extra-virgin" and "virgin" olive oils are processedby crushing olives into a mash, which is pressed to extract the oil (this is called the first press) withoutthe use of heat (called cold pressing).

Extra-virgin oils are of higher quality, as the olives used to make them are processed within 24 hours of picking—the longer olives go between picking and processing, the higher their free fatty acid content (extra-virgin olive oil can have up to 0.8 percent, virgin oils 2 percent). Extra-virgin oils also have more polyphenols than virgin oils.

Oils can be "filtered"—or not. Unfiltered oils have tiny particles of olive flesh in them, which reduces shelf life, and may appear cloudy if those particles haven’t settled at the bottom of the bottle.

"Pure" olive oil or simply olive oil are below extra-virgin and virgin standards and are heavily processed to remove off flavors and aromas. Though the oil still is a source of monounsaturated fat, itsbeen stripped of healthful polyphenols.

"Light," "lite" and "extra-light" are purelymarketing terms used on highly refined oils that refer to mild flavor and/or color, not reduced calorie content.

"Product of Italy" means the oil was processed in Italy, not necessarily that the olives were grown there. You can find oils that use solely Italian olives—or olives from Greece or California.

Often made from olives from single estates or particular growing regions, these high-quality artisan oils have more distinct flavors—and are more expensive. When seeking out these oils, look for seals and designations as helpful indications of quality.

Denominazione d’Origine Protetta (DOP) in Italy, Appellation d’Origine Contrôlée (AOC) in France and Denomination of Origin (DOP) throughout the European Union (EU) identify products produced, processed and prepared in regions known for expertise in that particular product.

The California Olive Oil Council (COOC) and International Olive Council (IOC) certify and give their mark to quality extra-virgin olives oils, from California and the EU respectively, based on taste and quality.

Below are some (seven) of the highest rated** realolive oils:

Pompeian Extra VirginOlive Oil
Pompeian olive oil polarized reviewers with its taste and smell

Divina Extra Virgin Olive Oil
Many tasters agreed that Divina olive oil smelled clean and woody, but the product failed to deliver in flavor

Colavita Extra Virgin Olive Oil
Although this oil received some points for its floral and herbaceous smell, its extremely bitter flavor sparked intense reactions as well.
Filippo Berio Extra Virgin Olive Oil
This olive oil was praised for its "fresh"and "mellow" scent

California Olive Ranch Extra Virgin Olive Oil
This very mellow, light tasting oil has an almost sweet nuttiness and a fruity scent reminiscent of green olives

Monini Extra Virgin Olive Oil
The perfect all-in-one oil, with a lightness that's also surprisingly rich and complex. A peppery kick at the end gives it some oomph. Try it for making pesto or cooking shellfish.

Whole Foods 365 Extra Virgin Olive Oil
The house brand of the Whole Foods Market chain has an intenselyrobust olive taste — and a much lower price than most top-grade oils.

**All ratings are from the last major testing and competition in 2012**

What You Need to Know about Smoke Point

You might have heard that you can’t cook with extra-virgin olive oil because it breaks down when heated, creating harmful substances and destroying its beneficial properties. But all oils break down when they are heated to their smoke point or reheated repeatedly.

However, an oil’s smoke point is really a temperature range (olive oil’s is between 365-420°F), not an absolute number because many factors affect the chemical properties of oil.

You can safely and healthfully cook with any oil by not heating it until it’s smoking—to get your oil hot enough to cook with, just heat it until it shimmers.