Olive Oil Health Benefits: What the Evidence Supports

Short answer: the best-supported benefit of extra virgin olive oil is for the heart. Used in place of ghee, butter or other saturated fats, it helps lower LDL (“bad”) cholesterol. Its natural polyphenols add a second layer of protection that refined oils don’t have. Most other benefits you read about are real but modest, or still being studied. Olive oil is a good everyday fat, not a medicine.

Almost all of the research looks at olive oil as part of a whole diet, usually the Mediterranean diet. The benefit comes largely from what it replaces. A spoonful added on top of a heavy, fried diet does much less than the same spoonful used instead of something worse.

1. Heart health: the strongest evidence

About three quarters of olive oil is oleic acid, a monounsaturated fat. Swapping saturated fat for monounsaturated fat lowers LDL cholesterol, which is one of the main drivers of heart disease.

The best-known trial is PREDIMED, which followed about 7,000 people in Spain at high risk of heart disease. People told to follow a Mediterranean diet with extra virgin olive oil had roughly 30% fewer heart attacks, strokes and cardiovascular deaths than those on a low-fat diet. They were using around four tablespoons a day as their main cooking and table fat, not as an extra.

2. Polyphenols: what extra virgin has and refined oil doesn’t

Extra virgin olive oil contains natural antioxidants called polyphenols, mainly hydroxytyrosol and its relatives. The European Food Safety Authority accepts one specific claim for them: olive oil polyphenols help protect blood fats from oxidative damage. That claim only applies to oils with a meaningful polyphenol content, eaten daily. Refining removes most of these compounds, which is why the grade matters for health and not just for taste.

3. Inflammation

Fresh extra virgin oil contains oleocanthal, the compound that makes it sting the back of your throat. In laboratory studies it acts on the same inflammation pathway as ibuprofen. The amount in a normal diet is far smaller than a painkiller dose, so this is best thought of as a small, steady contribution over years, not a treatment.

4. Blood sugar

Olive oil does not raise blood sugar itself, and eating fat alongside carbohydrates slows how quickly the sugar is absorbed. Some studies link olive-oil-rich diets with better insulin sensitivity and lower rates of type 2 diabetes. The effect depends on the rest of the meal: olive oil on a white-flour paratha is still a white-flour paratha.

5. Digestion

A little fat helps the gallbladder release bile and keeps digestion moving, and many people find a spoonful of olive oil helps with occasional constipation. The research here is mostly small, but the tradition is long and the risk is low.

6. Weight

A tablespoon of olive oil has about 120 calories, the same as any oil, so it is not a weight-loss food. Diets that include olive oil do tend to be more filling and easier to stick to than very low-fat diets, which is where the weight link in the research comes from. Measure it rather than pouring freely.

7. Brain and ageing

Large observational studies find that people who eat a Mediterranean-style diet with plenty of olive oil tend to have slower cognitive decline. These studies show an association, not proof that the oil itself is responsible, and the research is ongoing.

8. Absorbing other nutrients

Vitamins A, D, E and K, and plant pigments like the lycopene in tomatoes, are fat-soluble. A drizzle of olive oil on a salad or cooked vegetables helps your body take them up.

Taking a spoonful of olive oil every day

Many people in Pakistan take a spoonful of zaitoon oil in the morning. It is a reasonable habit, with a few points to keep in mind:

• How much: one to two tablespoons a day is a sensible amount if it is on top of your normal cooking fat. If olive oil replaces your cooking fat, more is fine.
• When: there is no good evidence that an empty stomach works better than taking it with food. Take it whenever you will remember.
• Which oil: only extra virgin carries the polyphenols. A spoonful of refined or pomace oil is just fat.
• Who should check first: anyone with gallstones or gallbladder problems, or on a strict calorie limit, should talk to their doctor.

What the evidence does not support

Olive oil will not cure disease, detox the body or melt fat. Some laboratory studies on polyphenols and cancer are interesting, but they are early and should not guide anyone’s treatment. Be wary of any product, ours included, that promises more than a good everyday fat can deliver.

Getting the most from it

• Choose genuine extra virgin. The health case rests on the polyphenols, and only extra virgin has them.
• Use it fresh. Polyphenols fade with time, heat and light, so store it well and finish an open bottle within a few months.
• Use it instead of saturated fats in everyday cooking, not only as a supplement.

For the numbers per spoonful, see olive oil nutrition facts. For using it on skin and hair, see olive oil for skin and hair.

Frequently asked questions

Is extra virgin olive oil healthier than other cooking oils?

It is one of the best choices because of its monounsaturated fat and polyphenols, and it holds up well to normal home cooking. Its biggest advantage is over ghee, butter and vanaspati.

Can I drink olive oil every day?

Yes. One to two tablespoons a day is common and safe for most people. Remember that it adds about 120 calories per tablespoon.

Does olive oil raise blood sugar?

Not on its own: it has no carbohydrate (0 g per 100 g on our label). Anyone managing diabetes should plan their diet with their doctor.

Does cooking destroy olive oil’s benefits?

Normal home cooking keeps most of the benefit. Very long, very hot frying reduces the polyphenols, which is why extra virgin shines most when used raw or at moderate heat.