Is Olive Oil a Saturated or Unsaturated Fat?

For decades, fat has been one of the most debated topics in nutrition. Some diets praise high-fat eating, while others warn against it entirely. One of the most common questions people ask is: is olive oil a saturated or unsaturated fat?

The short answer is that olive oil is predominantly an unsaturated fat — and that’s one of the main reasons it’s widely considered one of the healthiest fats you can consume.

But the story is more nuanced than simply “good fat” versus “bad fat.” To understand why olive oil has earned its reputation, it helps to explore the differences between saturated and unsaturated fats, how they affect the body, and why quality matters.

Understanding Saturated vs Unsaturated Fat

Fats are made up of fatty acids, which are generally grouped into two main categories:

Saturated Fats

Saturated fats are typically solid at room temperature and are commonly found in:

• Butter
• Lard
• Fatty cuts of meat
• Cheese
• Coconut oil
• Palm oil

For many years, saturated fats were linked to increased LDL (“bad”) cholesterol and a higher risk of heart disease. However, modern research has challenged the idea that all saturated fats are equally harmful, and the debate continues among nutrition scientists.

Unsaturated Fats

Unsaturated fats are usually liquid at room temperature and are considered more heart-friendly. They are found in:

• Olive oil
• Avocados
• Nuts and seeds
• Oily fish

Unsaturated fats are divided into:

• Monounsaturated fats – the primary fat in olive oil
• Polyunsaturated fats – found in foods like walnuts and salmon

These fats are associated with improved heart health, reduced inflammation, and better cholesterol balance.

So, What Type of Fat Is Olive Oil?

Olive oil is mainly made up of monounsaturated fat, particularly oleic acid.

A typical extra virgin olive oil contains approximately:

• 70–80% monounsaturated fat
• 10–15% saturated fat
• 5–10% polyunsaturated fat

So while olive oil does contain a small amount of saturated fat, it is overwhelmingly an unsaturated fat.

This composition is one reason olive oil is a cornerstone of the Mediterranean diet, one of the world’s most researched eating patterns.

Why Unsaturated Fats Matter

Unlike trans fats and excessive amounts of processed fats, unsaturated fats can support several important functions in the body.

Heart Health

Monounsaturated fats may help:

• Lower LDL cholesterol
• Maintain or increase HDL (“good”) cholesterol
• Support healthy blood vessels

This is one reason diets rich in olive oil are associated with lower rates of cardiovascular disease.

Anti-Inflammatory Benefits

High-quality extra virgin olive oil contains natural compounds called polyphenols, including oleocanthal, which has anti-inflammatory properties similar to ibuprofen.

Chronic inflammation is linked to many modern diseases, including:

• Heart disease
• Type 2 diabetes
• Arthritis
• Cognitive decline

Antioxidant Protection

Extra virgin olive oil is rich in antioxidants such as vitamin E and polyphenols, which help protect cells from oxidative stress caused by free radicals.

Brain Function

Some studies suggest diets rich in olive oil may support memory and long-term cognitive health, particularly when combined with a Mediterranean-style diet.

The Debate Around Fat Isn’t Black and White

Nutrition science has evolved considerably over the past 50 years.

In the 1980s and 1990s, many low-fat diets replaced fats with refined carbohydrates and sugar — a shift now believed to have contributed to rising obesity and metabolic disease.

Today, most experts agree that:

• Fat itself is not the enemy
• The type and quality of fat matters most
• Highly processed trans fats are the most harmful
• Whole-food fat sources are generally preferable

This has led to renewed appreciation for traditional fats like olive oil, particularly when minimally processed.

Why Quality Olive Oil Matters

Not all olive oils are created equal.

Extra Virgin Olive Oil (EVOO)

Extra virgin olive oil is the highest quality grade:

• Mechanically extracted without chemicals
• Low in acidity
• Rich in antioxidants and flavour compounds

Good EVOO should smell:

• Fresh
• Grassy
• Fruity
• Slightly peppery

A peppery sensation at the back of the throat is often a sign of healthy polyphenol content.

Processing and Freshness

Flavour and nutritional value are heavily influenced by:

• Harvest timing
• Bruising during picking
• Processing speed
• Pressing temperature
• Storage conditions

Olives that are damaged or left too long before pressing can oxidise quickly, reducing both taste and health benefits.

In short…

So, is olive oil a saturated or unsaturated fat?

Olive oil is predominantly an unsaturated fat, rich in heart-friendly monounsaturated fats and beneficial antioxidants. While it does contain a small amount of saturated fat, its overall nutritional profile is one of the reasons it remains central to healthy dietary patterns around the world.

As research continues to evolve, one thing has become increasingly clear: focusing on minimally processed, high-quality foods — including good extra virgin olive oil — is likely more important than fearing fat itself.