Drinking Olive Oil for Weight Loss: What the Evidence Actually Shows
If you have searched for drinking olive oil for weight loss, you have probably seen the claim made with great confidence: a spoonful in the morning on an empty stomach, and the weight starts to come off. It is one of the more durable wellness ideas online, and like most durable wellness ideas, it sits on a real foundation that has been stretched well past what the evidence supports. There is genuine research on olive oil, appetite, and satiety. There is also a plain fact about calories that the confident version tends to leave out. This article walks through both, honestly, so you can decide what to do with the information rather than being told what to believe.
For our own oil, see our cold-pressed organic Marrakech olive oil.
The Short Answer
- Drinking olive oil is not a weight-loss trick in itself. No food makes weight come off on its own; overall energy balance still decides that.
- There is real research behind the satiety idea. Oleic acid, the main fat in olive oil, is converted in the small intestine to a compound that helps regulate appetite, and fat triggers fullness hormones.
- Olive oil is calorie-dense — roughly 120 kilocalories a tablespoon. Added on top of what you already eat, those calories count, and they add up quickly.
- The evidence does not show that drinking it neat beats using it in meals. If anything, using it with food helps you absorb nutrients better.
- Where olive oil genuinely earns its place is as the principal fat in a Mediterranean-style way of eating, which has the largest evidence base of any traditional diet pattern.
- Quality matters more than ritual. A fresh, cold-pressed, unfiltered extra virgin oil carries the polyphenols and flavour that a refined supermarket blend has largely lost.
Why People Drink Olive Oil for Weight Loss in the First Place
The idea is not invented from nothing. Fat is the most satiating of the three macronutrients to a lot of people, and olive oil is mostly fat — predominantly oleic acid, a monounsaturated fatty acid that makes up somewhere between 55 and 83 per cent of the oil's fatty-acid profile depending on origin and varietal. When you eat fat, it slows the rate at which your stomach empties and it prompts your gut to release hormones that tell your brain you have had enough. So the felt experience is real: a meal with good olive oil in it often leaves you fuller for longer than the same meal without it.
From there, the logic runs: if olive oil makes you feel full, then taking it on its own first thing should blunt your appetite for the rest of the day. It is a reasonable hypothesis. The problem is what happens when you test it carefully, which researchers have done.
What the Research on Satiety Actually Found
The mechanism has a name worth knowing. When your small intestine processes oleic acid, it produces oleoylethanolamide — usually shortened to OEA — a signalling compound linked in published research to reduced appetite and lower food intake. Alongside this, dietary fat stimulates satiety hormones such as cholecystokinin (CCK) and GLP-1. None of this is fringe; it is reasonably well-established physiology.
One of the more interesting studies came from a collaboration between Professor Peter Schieberle's group at the Technical University of Munich and Professor Veronika Somoza's group at the University of Vienna, published in 2013. Over three months, participants ate low-fat yoghurt enriched daily with one of four fats — lard, butterfat, rapeseed oil, or olive oil. The olive oil group showed higher blood levels of the satiety-linked hormone serotonin, kept their calorie intake steady, and did not gain body fat, while the control group ended up consuming around 176 extra kilocalories a day.
Here is the honest twist the headlines often skipped: when the team dug into why, they found it was largely the aroma compounds in the olive oil driving the satiety effect, not simply the oil's fat. A group given plain yoghurt with olive oil aroma extract still showed the response. That is a fascinating result — and it is not the same as proving that swallowing a tablespoon of oil neat melts away weight.
The Calorie Point Nobody Selling the Trick Wants to Mention
Olive oil is energy-dense. A single tablespoon carries roughly 120 kilocalories, and it is easy to pour more than a tablespoon. If you add a daily shot of oil on top of your usual meals in the hope of losing weight, you are adding calories — and unless the satiety effect causes you to eat enough less elsewhere to more than cancel them out, the arithmetic works against you.
This is the part where the wellness version and the evidence part ways. The careful reviews are consistent: drinking olive oil offers no clear advantage over using the same oil in your food, and using it with food helps you absorb fat-soluble nutrients more effectively. Some people do report that a morning spoonful helps them feel steadier and snack less, and there is no real harm in trying it — it can occasionally cause stomach upset, but it is not dangerous. What it is not is a mechanism that overrides energy balance.
The honest answer, then, is that olive oil can be a genuinely useful part of how you eat, but the ritual of drinking it neat is doing less than its reputation suggests. The oil earns its keep on the plate, not in a shot glass.
Where Olive Oil Genuinely Fits a Healthy Pattern
Step back from the single-spoonful framing and the picture improves considerably. Olive oil is the principal fat in the Mediterranean dietary pattern, which has the largest and most consistent evidence base of any traditional way of eating for long-term health and weight maintenance. People eating this way tend, over time, to manage their weight better — not because of any one food, but because the overall pattern is satisfying, rich in plants, and built around a fat that makes vegetables, pulses, and whole grains genuinely pleasant to eat in quantity.
There is also a quality dimension that the weight-loss conversation usually ignores. Extra virgin olive oil carries polyphenols — oleocanthal, oleuropein, hydroxytyrosol, and tyrosol — which are well-studied antioxidants. The EU has a registered health claim (Regulation 432/2012) recognising that olive oil polyphenols help protect blood lipids from oxidative stress, at an intake of at least 5 mg of hydroxytyrosol and its derivatives per 20 g of oil per day. These compounds degrade with heat and age, which is why a fresh, cold-pressed, unfiltered oil is a different proposition from a refined blend that has been stripped and deodorised. If you are going to make olive oil a daily habit, the quality of the oil is the lever worth pulling.
How to Use Olive Oil Sensibly if Weight Is Your Goal
A few plain, practical points. Use olive oil instead of less useful fats and refined oils, not in addition to everything else — the substitution is where the benefit sits, not the supplementation. Keep an eye on the amount; a tablespoon or two across a day's cooking and dressing is a reasonable frame, and pouring with abandon undoes the calorie maths. Use it raw where you can — drizzled over vegetables, stirred through pulses, finishing a dish — so the polyphenols and flavour survive. And treat the morning-shot ritual as optional rather than essential: if you enjoy it and it helps you eat more mindfully, fine, but it is not the mechanism doing the work.
Most of all, be sceptical of anything that promises weight loss from a single food or a single habit. The research on olive oil is genuinely interesting, and the satiety findings are real. They simply do not amount to a shortcut.
Why Sidr & Stone
This article has been careful to separate what olive oil can honestly do from what it is sold as doing. That same instinct is how we approach our own oil. We are not going to tell you that drinking our olive oil will make you lose weight, because that would be exactly the kind of claim this article has spent its length warning against. What we will tell you is what is actually in the bottle.
- Single-estate — one family-owned grove on the plains outside Marrakech, Morocco, with no blending across origins.
- Rain-fed — no irrigation; the trees take what the season gives them.
- Organically grown — no synthetic fertilisers, pesticides, or herbicides.
- Single harvest — a small, limited batch, harvested only when the season says the fruit is ready, sometimes weeks later than neighbouring farms.
- Cold-pressed within hours of harvest — flavour, aroma, and polyphenols preserved by pressing while the fruit is fresh.
- Unfiltered extra virgin — minimally processed, and it may show a little natural sediment, which is normal and, if anything, a sign of a genuine unrefined oil.
- 100% natural — a single ingredient, olive oil, with nothing added.
- Dark glass with a gold label — protective packaging that shields the oil from the light that degrades polyphenols.
- Halal certified, with 10% of profits going to charity, and fulfilment in the UK, EU, and US.
We will not tell you Sidr & Stone is the best olive oil — that would be the very claim this article warns against. What we will say is that our oil is single-estate Moroccan, rain-fed, organically grown, and cold-pressed within hours of harvest, and that the evidence of that care is in the taste, the colour, and the season's small limited batch.
Frequently Asked Questions
Does drinking olive oil help you lose weight?
Not on its own. Olive oil's fat triggers satiety signals that can help you feel full, but it is calorie-dense, and added on top of your usual diet it adds energy rather than removing it. Weight is decided by overall energy balance, not by any single food or ritual.
Is it better to drink olive oil or use it in food?
Using it in food. Careful reviews find no clear advantage to drinking olive oil neat over using the same oil in meals, and using it with food helps you absorb fat-soluble nutrients better. The benefit is in the substitution, not the spoonful.
Why do people say to drink it on an empty stomach?
The idea is that taking it first thing blunts appetite for the day. The satiety mechanism behind it is real, but the research does not show that drinking it neat on an empty stomach outperforms simply including good olive oil in your meals.
How does olive oil affect appetite?
Its main fat, oleic acid, is converted in the small intestine to oleoylethanolamide (OEA), a compound linked to reduced appetite. Fat also stimulates satiety hormones such as CCK and GLP-1, and one study found olive oil's aroma compounds raised serotonin and helped people eat less.
How much olive oil should I have a day?
A tablespoon or two across a day's cooking and dressing is a sensible frame for most people. Because the oil is energy-dense — roughly 120 kilocalories a tablespoon — pouring freely can quietly add a lot of calories.
Does the quality of the olive oil matter for this?
Yes. Fresh, cold-pressed, unfiltered extra virgin oil retains the polyphenols and flavour that refining and ageing strip away. If olive oil is going to be a daily habit, a genuine extra virgin oil is a meaningfully different product from a refined blend.
Can I buy Sidr & Stone olive oil now?
Our single-estate Marrakech olive oil is available to pre-order ahead of its first harvest, with fulfilment in the UK, EU, and US. It is a small, limited first pressing, and you can reserve yours from the product page.
Is olive oil a medicine?
No. Olive oil is a food, not a medicine. It has a long traditional history — including being honoured in the Prophetic Sunnah — and a substantial body of modern research, particularly around polyphenols, cardiovascular health, and the Mediterranean diet pattern. It can be a worthwhile part of a healthy routine, but it does not cure diseases and is not a substitute for medical care. Be cautious of any olive oil marketed with specific disease-cure claims.
Final Thoughts
Drinking olive oil for weight loss is a half-truth, and the half that is true is genuinely worth understanding. Olive oil's fat does trigger fullness signals; oleic acid does convert to an appetite-regulating compound; a notable study did find olive oil's aroma helped people eat less. What none of that establishes is a shortcut. The calorie density is real, the advantage of drinking it neat over using it in food is not, and the gravity of energy balance does not lift for any single ingredient.
The more useful framing is the one the evidence actually supports: olive oil is a high-quality fat that makes a satisfying, plant-rich way of eating both pleasant and sustainable, and the better the oil, the more it brings to the table. Choose a fresh, cold-pressed extra virgin oil, use it in place of poorer fats, keep half an eye on the quantity, and let the overall pattern do the work that no spoonful can.
Our cold-pressed organic Marrakech olive oil — single-estate, rain-fed, organically grown, and cold-pressed within hours of harvest — is available to pre-order now, with fulfilment in the UK, EU, and US.
Pre-Order Sidr & Stone Organic Marrakech Olive Oil — Limited First Harvest →
Disclaimer: This article explains what current research suggests about olive oil, appetite, and weight at the time of writing; research findings and brand practices may change, and readers should check current sources. Olive oil is a food, not a medicine, and is not a substitute for medical treatment of any condition. For any health concern, consult a qualified medical professional.
