Drinking olive oil before bed is a traditional Mediterranean wellness practice with some modern scientific support — particularly for digestive health, sleep quality, and overnight cardiovascular protection. For a complete overview, see our Olive Oil Gastronomy: Cooking, Baking & Culinary Uses guide.For a complete overview, see our Cooking Properties guide.The practice involves consuming 1–2 tablespoons of extra virgin olive oil (EVOO) on an empty stomach before sleeping, either directly or mixed into warm water or milk. The claimed benefits range from improved digestion and gut motility to better sleep and morning regularity. Some of these claims are well-supported by evidence; others are traditional practices without strong clinical validation.1 3
This article covers what the evidence says about drinking olive oil before bed, what benefits are real, what risks exist, and how to do it correctly.
Olive oil before bed has been a folk remedy in Mediterranean cultures for centuries — used as a digestive aid, a mild laxative, and a sleep support. The practice typically involves taking 1–2 tablespoons of raw EVOO on an empty stomach before sleeping. In some traditions, it is mixed with lemon juice or warm milk; in others, it is taken alone. The practice is most common in Greece, Southern Italy, and parts of the Middle East.1 2
Modern interest in this practice was sparked by wellness influencers promoting the practice as a detox or weight-loss aid — claims that are not well-supported by evidence. But the underlying digestive and cardiovascular benefits of evening olive oil consumption have legitimate scientific support.
Digestive and gut motility benefits: There is moderate evidence that olive oil can support digestive health and improve gut motility. A tablespoon of olive oil consumed before sleep can act as a mild laxative by stimulating bile release and facilitating overnight gut motility. Studies on olive oil and gastroesophageal reflux (GERD) show that a small amount of EVOO before bed can reduce nighttime reflux symptoms for some people. The oleic acid in olive oil may also support the health of the gastric mucosa.1 4
Sleep support: There is no direct clinical trial evidence that olive oil before bed improves sleep quality. However, the Mediterranean diet as a whole — with olive oil as the primary fat — is associated with better sleep quality in large observational studies. Consuming olive oil with dinner or before bed as part of a Mediterranean dietary pattern may contribute to sleep benefits observed in Mediterranean populations, but the specific Timing of "before bed" has not been isolated as a factor. The sleep benefits of the Mediterranean diet are more likely attributable to the overall dietary pattern than to any specific timing of olive oil intake.4
Overnight cardiovascular protection: The antioxidant and anti-inflammatory effects of olive oil polyphenols persist for several hours after consumption. Taking olive oil before bed means that the highest polyphenol activity in the bloodstream occurs during the overnight hours — when cardiovascular events (heart attack, stroke) are statistically most likely to occur. While there is no specific clinical trial testing this hypothesis, the mechanistic plausibility is real: polyphenols reduce blood clotting, improve endothelial function, and reduce inflammation, and these effects would be active during the overnight period.3 4
Weight management: Claims that drinking olive oil before bed promotes weight loss are not supported by clinical evidence. Olive oil contains 120 calories per tablespoon. Any metabolic benefit of olive oil's polyphenols and MUFA content is not specific to evening consumption, and adding olive oil to your diet without removing equivalent calories will result in weight gain, not loss. The drinking olive oil before bed](/drink-olive-oil-before-bed/) article covers this specifically.
If you want to try olive oil before bed, the evidence-based approach:1 3
Timing: 30–60 minutes before sleeping is better than immediately before bed. Taking oil right before lying down can cause reflux in some people.
Amount: 1 tablespoon is the standard dose. Do not exceed 2 tablespoons (approximately 240 calories).
Method: Taken alone, or mixed into warm water with lemon. Some people prefer it slightly warmed. Do not cook or heat it — the practice relies on raw consumption to preserve polyphenols.
Quality matters: Use your best EVOO — the higher the polyphenol content, the more benefit you derive. High-polyphenol varieties (Koroneiki, Picual) are the best choice for this practice.
Who should avoid it: People with bile duct disorders, gallbladder disease, or chronic diarrhea should not use olive oil as a digestive aid without medical supervision.
Calories: 1 tablespoon = 120 calories. This adds up if used daily. Account for it in your total daily caloric intake.
Reflux: For some people with GERD, taking oil before bed can worsen nighttime reflux symptoms. If you experience this, stop the practice.
Quality matters enormously: Only genuine EVOO retains the polyphenols and antioxidants that make this practice worth trying. Refined "olive oil" has none of the proposed benefits and is just calories.
Not a standalone solution: Olive oil before bed is a complement to, not a replacement for, a healthy dietary pattern. The Mediterranean diet is what the evidence supports — olive oil at any time of day is part of that pattern.
Drinking olive oil before bed has some evidence of benefit for digestive health and overnight cardiovascular support, but is not a magical practice. The digestive benefit (improved gut motility, mild laxative effect) has reasonable support. The cardiovascular benefit is mechanistically plausible (polyphenol antioxidants active overnight when heart attack risk peaks) but not specifically tested in clinical trials. The sleep, detox, and weight loss claims associated with this practice are not well-supported by evidence. The key requirement is using genuine extra virgin olive oil — refined olive oil has none of the proposed benefits. The optimal approach is 1 tablespoon of high-polyphenol EVOO, taken 30–60 minutes before bed (not immediately), as part of a healthy Mediterranean dietary pattern.1 3 4
The standard recommendation is 1 tablespoon (approximately 15ml, 120 calories) of extra virgin olive oil, taken 30–60 minutes before sleeping. This is enough to provide a meaningful dose of polyphenols without adding excessive calories. Do not exceed 2 tablespoons per day of olive oil consumed specifically before bed — this would add approximately 240 calories, which would need to be offset by reducing other caloric intake. For digestive benefits specifically, 1 tablespoon on an empty stomach before bed is the traditional and evidence-supported dose. If you are using olive oil before bed for cardiovascular benefits, the same total daily amount matters more than the timing — spreading intake across the day (including before bed) is a reasonable approach.1 3
Yes — there is moderate evidence that olive oil before bed can help with constipation. The mechanism is two-fold: olive oil acts as a mild laxative by stimulating bile release from the gallbladder (bile aids fat digestion and gut motility), and the overnight period allows the oil to coat the intestinal lining and facilitate stool passage in the morning. A 2015 study on elderly patients with constipation found that 4ml/kg/day of olive oil (approximately 280ml for a 70kg adult) significantly improved constipation symptoms. The traditional dose of 1 tablespoon before bed is a lower but more practical version of this effect. High-polyphenol EVOO is more effective than refined olive oil for this purpose. For chronic constipation, olive oil before bed can be part of a constipation-management strategy that includes adequate hydration, fiber intake, and physical activity.1 4
The most common side effects of drinking olive oil before bed are mild and manageable: (1) digestive discomfort or nausea if taken on a full stomach — always take on an empty stomach; (2) nighttime acid reflux or GERD symptoms in some people — if this occurs, stop the practice; (3) diarrhea or loose stools if too much is consumed — stay to 1–2 tablespoons maximum; (4) weight gain if calories are not accounted for — olive oil adds 120 calories per tablespoon. More rarely, people with gallbladder disease may experience gallbladder attack symptoms from the bile-stimulating effect of olive oil — those with known gallbladder issues should not use olive oil as a laxative without medical supervision. Allergic reactions to olive oil are rare but possible. The benefits of olive oil before bed for people without these contraindications generally outweigh the risks at standard doses of 1–2 tablespoons.1
1. Olive Oil Source. "Olive Oil Classification and Standards." https://www.oliveoilsource.com/info/olive-classification
3. EFSA Panel on Dietetic Products. "Scientific Opinion on health claims related to olive oil polyphenols." EFSA Journal. 2011.
4. Gutierrez-Mariscal FM et al. "Evidence for the Benefits of Olive Oil in Human Health." Frontiers in Nutrition. 2022.