Where the habit comes from
Taking olive oil on an empty stomach is not a new wellness trend. It is an old habit in southern Italy, Greece and elsewhere in the Mediterranean, passed down in olive-growing families. In the villages of Castroreale and the Messina hills, older generations have started the day with a small pour of new oil for as long as anyone can remember, often simply to taste the new harvest.
What the research has and has not looked at
Extra virgin olive oil is one of the most studied foods in nutrition research, but it is worth being precise about what was studied.
Large diet studies. Trials such as PREDIMED (New England Journal of Medicine, 2013; corrected republication 2018) compared Mediterranean diets that included generous amounts of extra virgin olive oil with a control diet. They studied a whole way of eating over several years, not a morning spoonful and not any particular brand.
Compound studies. Laboratory research has looked at individual compounds in olive oil, such as oleocanthal (Beauchamp et al., Nature, 2005) and hydroxytyrosol. Laboratory findings describe chemistry; they do not show what a spoonful of oil does in a person.
Timing. We are not aware of good evidence that taking olive oil on an empty stomach changes how it is absorbed or what it does, compared with using the same oil with food.
So the honest summary is that the research supports olive oil as part of a Mediterranean pattern of eating. The morning shot is a pleasant tradition rather than something the studies tested.
How much is sensible
A tablespoon of olive oil is about 14 g and about 120 calories, so a daily spoonful adds up. If you take one, count it as part of the fat you eat in a day and use a little less elsewhere.
Most people who keep the habit take a teaspoon to a tablespoon. If fat on an empty stomach does not agree with you, start with a teaspoon or simply have it with breakfast instead, drizzled over bread or tomatoes, which is how most Sicilians eat it.
Why freshness and quality matter
Whatever the reason you use olive oil, quality shapes what is in the bottle and how it tastes.
Polyphenols fade with age. An oil pressed in October and opened 18 months later has lost much of its original polyphenol content and pepper, even if it still says "extra virgin". The harvest date tells you more than the best-before date.
Refining removes them. "Pure", "light" and blended olive oils have been refined, which strips out polyphenols along with the flavour.
Cold extraction preserves them. Pressing below 27°C keeps more of the natural phenolic compounds; warmer presses raise the yield and lose some of them.
For transparency, our 2024/2025 Early harvest was independently measured at 410 mg/kg total polyphenols, with free acidity of 0.30% or below and peroxides below 2 meq O₂/kg. The full laboratory report is at castruriali.com/info.
What it will not do
Olive oil is a food, not a medicine. A morning spoonful is not a treatment for any condition, it will not cause weight loss or "detox" the body, and it will not make up for an otherwise poor diet.
If you have a medical condition, gallbladder problems or take regular medication, ask your doctor or a registered dietitian before making changes to your diet. Nothing in this guide is medical advice.
The peppery catch: what it tells you
If you take a spoonful of fresh extra virgin olive oil and feel a distinct peppery catch at the back of your throat, enough to make you cough, that is oleocanthal. It is one of the simplest quality checks you can do without a laboratory.
A fresh, early-harvest oil produces it; an old, refined or blended oil usually does not. The Italian word for it is "pizzicante", the little sting. In Castroreale, people say the good oil makes you cough.
Sources
Castruriali sells extra virgin olive oil and has a commercial interest in this subject. Read our editorial standards and research policy. Health information is educational and is not medical advice.