In Short:
The ingredients in an olive oil and lemon shot (high-quality EVOO and fresh lemon juice) are genuinely well-studied and health-supportive, but there are no clinical trials on the ritual itself and the more dramatic claims around detoxing, gallstone flushing, and rapid weight loss don't hold up. If the shot is what gets you using a fresh, high-polyphenol extra virgin olive oil every day, that habit is worth keeping - just don't expect the glass to do what a good diet does.
Olive oil has been a staple of Mediterranean kitchens for centuries. The olive oil and lemon shot, on the other hand, is very much a 2020s invention - a morning ritual that's racked up millions of views and an impressive list of claimed benefits along the way.
At Masworth, we’re always interested in how olive oil is used beyond the kitchen. We also think it’s worth being honest about what the research actually supports - and where it doesn’t. So that’s why today we’re looking at the evidence behind the claims and what this ritual can realistically do.
What is the olive oil and lemon shot ritual?
The olive oil and lemon juice shot is a simple mixture: a tablespoon or two of extra virgin olive oil (EVOO) with fresh lemon juice, knocked back on an empty stomach before breakfast. Some people add honey, warm water, or both - the benefits of honey, lemon and olive oil together are often cited as an extra boost.
Online, it’s usually called a “detox” or digestive reset, with people claiming it does everything from flushing the liver to melting belly fat. The most common claims include:
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“Detoxing” the liver or gallbladder
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Reducing bloating and supporting bowel regularity
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Supporting weight loss or appetite control
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Improving skin clarity and lowering inflammation
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Supporting heart health and cholesterol balance
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“Alkalising” the body
Some of these have a basis in how olive oil behaves in the body - others don’t. Let's go through the evidence properly.
What does the research actually say?
Olive oil is one of the most studied fats in nutrition science. EVOO, a cornerstone of the Mediterranean diet, has consistently been linked with lower rates of heart disease, stroke, and overall mortality in large-scale studies.
One of the strongest pieces of evidence comes from the PREDIMED trial in Spain, which followed over 7000 people at high risk of heart disease. People who ate more EVOO had lower overall cardiovascular risk, with the top group seeing up to around a 39% reduction in cardiovascular disease compared with the lowest. The study also found that for every extra 10g of EVOO a day, heart disease risk and mortality dropped a little further.
The catch is what that research is actually based on: people eating olive oil as a daily staple across meals, as part of a broader dietary pattern, over years.
Not quick morning shots.
So, while there’s a clear understanding of how it benefits health, this morning ritual trend isn’t what the research is measuring.
Why polyphenol content matters here
The benefits associated with EVOO don't come from fat alone - they come largely from polyphenols, the compounds that give a good oil its peppery finish and most of its anti-inflammatory properties.
These compounds are linked in research to lower inflammation and improvements in key heart health markers - including how well blood vessels function. Polyphenol levels vary enormously between oils, and most supermarket EVOOs contain far less than the oils actually used in clinical research.
This is where the shot trend quietly goes wrong for most people. They're taking it with whatever olive oil is in the cupboard (often a mild, refined bottle with negligible polyphenol content) and wondering why they don't feel different.
Where it starts to make a real difference is with fresh, high-polyphenol extra virgin olive oil - the kind where the numbers are actually known. We've covered what to look for in detail in our high polyphenol olive oil guide, but the short version is: if the bottle doesn't have a published mg/kg figure, you're largely guessing.
What lemon juice brings to the table
Lemon juice is a meaningful source of vitamin C and citrus flavonoids, both of which have documented roles in antioxidant defence and vascular health - just not as a morning shot.
Most of the evidence comes from studies looking at overall fruit and vegetable intake. Large population research, including the WHO MONICA project, have linked higher vitamin C levels with better heart health and lower cardiovascular risk.
Some research also shows reduced oxidative stress on LDL cholesterol (the “bad” cholesterol), meaning it helps limit the kind of chemical damage that can make LDL cholesterol more likely to contribute to plaque build-up in the arteries.
There’s also some early research suggesting the natural compounds in citrus fruits may work well alongside olive oil polyphenols, giving a stronger overall antioxidant effect than either alone.
That does suggest there’s some biological logic to pairing the two together, but the research has only looked at them in food-based formats rather than as a shot - and the authors were clear that clinical evidence for the combination remains limited.
So, while lemon juice has clear nutritional value, the benefits show up as part of a balanced diet, not from a tablespoon of juice taken just before breakfast.
What claims hold up and what claims don’t?
Let’s take a quick look at what the science supports, and where the claims around this morning ritual start to fall apart.
What the evidence actually supports
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Heart and vascular health
The cardiovascular case for daily EVOO is one of the strongest in nutrition science. The polyphenols in high-quality extra virgin olive oil are linked to better cholesterol balance, lower oxidative stress in blood vessels, and improved arterial function. If heart health is your motivation for taking up this morning ritual, the science is on your side - as long as you're using a genuinely high-polyphenol oil and treating the shot as part of a broader healthy diet, not a standalone fix.
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Anti-inflammatory and antioxidant effects
EVOO polyphenols, especially oleocanthal, act on some of the same inflammation pathways as common anti-inflammatory drugs, just at much lower, dietary levels. When you add in the antioxidant properties of vitamin C from lemon, there’s a reasonable basis for the anti-inflammatory potential of the combination. The effects are gradual, long-term effects that come from regular inclusion in the diet - but that's true of most meaningful dietary changes.
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Digestion
Olive oil has a mild effect on gallbladder stimulation and gut movement, which may explain why some people feel a digestive benefit. What isn't plausible is a "cleanse" - your digestive system doesn't need resetting, and a tablespoon of oil won't do it if it did.
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Skin, energy, and the longer game
Skin benefits from olive oil are real, but they don’t come from a daily shot. If you're eating well, using good EVOO regularly, and sleeping properly, your skin will generally show that change over months. It’s a bit of a stretch to credit a morning ritual after only a couple of weeks.
Where the claims fall apart
We're pro-olive oil, but anti-false promises. A few things circulating online deserve a direct response:
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Liver detox and cleansing
Your liver detoxifies continuously, supported by overall diet, sleep, and lifestyle. No single drink accelerates that meaningfully, and there are no human trials showing that olive oil and lemon shots detoxify the liver or remove toxins.
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Gallstone flushing
The popular “olive oil and lemon flush” approach isn’t supported by clinical evidence and can carry risks for people who already have gallstones. The waxy material sometimes reported afterwards isn’t gallstones, but compounds formed during digestion of the oil.
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Rapid weight loss
Olive oil is energy-dense, so in a Mediterranean-style diet it can help with fullness and steady weight management. But adding extra morning shots on top of your normal diet can just bump up your calorie intake without bringing any real added benefit, which can have the opposite effect of what you’re aiming for.
If you want to try it
The ritual itself isn't the problem - the oil usually is. If you're going to make this a daily habit, a few things are worth getting right:
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Use a high-polyphenol EVOO. A tablespoon of fresh, high-polyphenol extra virgin olive oil, like Masworth Family Groves (965 mg/kg, independently tested) or November Polyphenols EVOO (1200+ mg/kg, independently tested), contains much higher levels of these than a supermarket bottle with no published polyphenol figure. .
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Start with one teaspoon if you have a sensitive stomach or reflux, and build up from there.
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Treat it as part of your daily EVOO use, not instead of it. The evidence behind olive oil comes from people who made it a consistent part of how they ate across meals - the shot works best as one moment in that broader habit.
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Avoid large doses if you have gallbladder disease or fat-malabsorption issues - check with a healthcare professional first.
The bottom line
The olive oil and lemon shot isn’t harmful, and both ingredients on their own do have well-studied health benefits. But there are no clinical trials on the ritual itself, and the more dramatic claims (liver detoxing, gallstone flushes, rapid weight loss) don't hold up when you look at the science.
What the research does strongly support is daily use of high-quality, high-polyphenol extra virgin olive oil as part of a Mediterranean-style way of eating. If a morning shot is what gets you into that habit, great - just make sure the oil is actually worth taking.
Both Masworth Family Groves and November Polyphenols EVOO are available on subscription, so you've always got a fresh, independently tested bottle ready without having to think about reordering.
FAQs
What are the benefits of olive oil and lemon juice on an empty stomach?
The main benefits of drinking olive oil with lemon juice on an empty stomach are the same as from the ingredients themselves - EVOO polyphenols support heart health and help reduce inflammation, while lemon juice provides vitamin C and flavonoids. Some people report a mild digestive effect, likely from fat stimulating the gallbladder. But there’s no evidence that taking it on an empty stomach changes anything, so the timing is more ritual than requirement.
Is there any evidence for the olive oil and lemon juice shot specifically?
No clinical trials have tested the olive oil and lemon juice shot as a morning ritual. The evidence base is for EVOO consumed as part of a broader Mediterranean-style diet, and separately for vitamin C-rich foods like lemon. The benefit of lemon juice and olive oil together is supported by a 2020 citrus olive oil study suggesting the combination has antioxidant logic behind it - but that's a long way from proving the shot ritual works as advertised.
Can olive oil and lemon juice damage your teeth or stomach?
Lemon juice is acidic and can affect tooth enamel over time - rinsing with water afterwards helps. Large amounts of oil on an empty stomach can worsen reflux for some people, so starting small and building up is sensible.
Does the type of olive oil matter for the shot?
Significantly. Most of olive oil's documented benefits come from its polyphenol content, which varies enormously between oils. A high-polyphenol EVOO with a published mg/kg figure gives you far more of the active compounds than a standard supermarket oil, even if both are labelled "extra virgin."
What's a realistic daily amount of olive oil?
One to two tablespoons (15-30ml) spread across meals is well-supported by research. Consistency matters more than volume - daily use over months is where the benefits accumulate.