How olive oil affects your health

Olive oil is a fat that comes from olives and contains compounds your body uses in different ways. The main benefit people talk about is that it may help reduce inflammation—a process in your body linked to heart disease, joint pain, and other conditions. Olive oil also contains antioxidants, which are substances that protect your cells from damage.

The research on olive oil is strongest for heart health. Studies of people who eat a Mediterranean diet—which uses olive oil as a main fat—show lower rates of heart disease and stroke compared to people eating other diets. That said, olive oil is still a fat, and all fats are calorie-dense, so portion size matters if you're watching your weight.

Key Takeaways

  • Olive oil contains compounds that may reduce inflammation in your body, which is linked to several chronic conditions.
  • Extra virgin olive oil—the least processed type—has more antioxidants and anti-inflammatory compounds than refined olive oil.
  • The strongest evidence for olive oil's benefits comes from studies of people eating Mediterranean-style diets, where it replaces other fats rather than adding extra calories.
  • Olive oil is calorie-dense at about 120 calories per tablespoon, so using it as a replacement fat rather than an addition matters for weight management.

The difference between types of olive oil

Not all olive oil is the same. Extra virgin olive oil is made by pressing olives without heat or chemicals, which keeps more of the plant compounds intact. It has a stronger taste and more of the substances linked to health benefits. Virgin olive oil is similar but made from lower-quality olives. Refined olive oil is processed with heat and chemicals, which removes most of the flavor and many of the beneficial compounds.

For cooking at high heat, refined olive oil is better because extra virgin breaks down at high temperatures. For drizzling on food, salads, or dipping bread, extra virgin is the choice if you want the compounds that research links to health. The price difference reflects this: extra virgin costs more because less processing means more of the original plant material remains.

What the research shows about inflammation and heart health

The compound in olive oil that gets the most research attention is called oleocanthal, which works similarly to some anti-inflammatory medications. Studies show it may reduce markers of inflammation in the blood. Another compound, oleuropein, appears to help protect blood vessel walls and may lower blood pressure slightly in some people.

The Mediterranean diet studies—which followed thousands of people over years—found that people who ate olive oil regularly had fewer heart attacks and strokes. However, these people also ate more vegetables, fish, and whole grains than typical Western diets, so olive oil alone was not the only factor. When researchers isolate olive oil in controlled studies, the effects are real but modest: small improvements in cholesterol levels and blood pressure, not dramatic changes.

Olive oil and weight management

Olive oil is calorie-dense: one tablespoon has about 120 calories and 14 grams of fat. If you add olive oil to your diet without removing other fats or calories, you will gain weight. The Mediterranean diet studies that showed health benefits used olive oil as a replacement for other fats—butter, vegetable oils, or fatty meats—not as an addition on top of what people already ate.

Some research suggests that olive oil may help you feel full longer than other fats, which could mean you eat less overall. But this effect is small and does not override basic calorie math. If weight management is your goal, measure your olive oil and use it intentionally rather than pouring freely.

How to use olive oil in cooking

Extra virgin olive oil has a smoke point around 375°F, which means it breaks down and loses its beneficial compounds when heated above that temperature. For sautéing vegetables at medium heat or roasting at moderate temperatures, extra virgin works fine. For high-heat cooking like frying or searing meat at very high temperatures, use refined olive oil or another oil with a higher smoke point, like avocado oil or refined vegetable oil.

Storage matters too. Olive oil degrades when exposed to light and heat, so keep it in a cool, dark cabinet rather than on a sunny counter or next to your stove. A bottle kept properly lasts longer and retains more of its beneficial compounds. Once opened, use it within a few months for best quality.

Olive oil and digestive health

Some people report that olive oil helps with digestion or constipation, and there is some research suggesting it may have mild laxative effects. The mechanism appears to be that olive oil stimulates the gallbladder and may increase bile flow, which helps move food through your digestive system. However, the effect is usually small, and too much olive oil can cause cramping or loose stools in some people.

If you are using olive oil specifically for digestive reasons, start with a small amount—a teaspoon or tablespoon—and see how your body responds. People with gallbladder problems should talk to their doctor before using olive oil for this purpose, since it stimulates the gallbladder and may cause discomfort if there are existing issues.

Olive oil and skin health

Olive oil is used in skincare products and some people explore it directly to skin. It does contain antioxidants and may help with dryness, but research on skin benefits is limited compared to research on heart health. If you use olive oil on your skin, test it on a small area first—it is heavy and can clog pores in some people, especially those with oily or acne-prone skin.

Eating olive oil may also support skin health indirectly through its anti-inflammatory effects, since inflammation is linked to acne and other skin conditions. But this is a general benefit of reducing inflammation in your body, not something unique to olive oil.

Frequently Asked Questions

Is olive oil better than other oils for health?

Olive oil has more research behind it than many other oils, especially for heart health. Other oils like avocado oil and walnut oil also have beneficial compounds, but olive oil has been studied more thoroughly. The choice depends on your cooking needs and taste preferences—extra virgin olive oil is best for flavor and compounds, while other oils may be better for high-heat cooking.

How much olive oil should I eat per day?

There is no official daily amount, but Mediterranean diet studies used about 2 to 3 tablespoons per day as part of an overall eating pattern. Since olive oil is calorie-dense, this amount replaces other fats rather than adding to your total calories. Start with what fits your diet and adjust based on your weight and health goals.

Can olive oil lower cholesterol?

Olive oil may help improve cholesterol levels slightly, particularly by raising HDL (good) cholesterol and lowering LDL (bad) cholesterol. The effect is modest—not as strong as medication—and works best when olive oil replaces saturated fats like butter or fatty meats in your diet.

Does olive oil go bad?

Yes. Olive oil oxidizes over time, especially when exposed to light and heat. An unopened bottle lasts one to two years; an opened bottle lasts a few months if stored in a cool, dark place. Rancid olive oil tastes off and loses its beneficial compounds, so replace it if it smells musty or tastes stale.

Is extra virgin olive oil worth the extra cost?

If you are using olive oil for its anti-inflammatory compounds, extra virgin is worth it because it has more of those compounds. If you are cooking at high heat, refined olive oil works just as well and costs less. For drizzling, dipping, or salads where you taste the oil, extra virgin's flavor makes the higher price worthwhile to many people.