Should you drink olive oil in the morning or at night? For a complete overview, see our Olive Oil Gastronomy: Cooking, Baking & Culinary Uses guide.For a complete overview, see our Cooking Properties guide.This is a common question, driven partly by social media trends promoting "olive oil shots" as a health practice and partly by genuine questions about whether the timing of fat intake affects absorption and benefit.
The answer is nuanced: timing matters less than consistency, but there are legitimate differences in how olive oil functions at different times of day.
The scientific literature does not support a strong circadian effect for olive oil consumption — meaning there is no clear evidence that your body processes olive oil's compounds differently at 8 AM versus 8 PM. However, there are practical and physiological considerations worth understanding.
Morning consumption: When you consume olive oil after an overnight fast (on an empty stomach, before breakfast), the fats stimulate bile release and gallbladder contraction. This can be beneficial for people with sluggish bile flow (a common issue with high-processed-food diets). The fat also stimulates gastric emptying and can affect how other nutrients are absorbed.
Evening consumption: Consuming olive oil with dinner means the fat is processed alongside a full meal, which slows digestion and may extend the absorption window. The polyphenols in olive oil consumed with food may have a longer window to interact with the gut lining.
The blood sugar consideration: Consuming fat with carbohydrates slows gastric emptying and reduces the glycemic response to carbohydrate-rich meals. If your dinner includes significant carbohydrates, consuming olive oil with it may reduce the blood sugar spike. This is most relevant for people managing blood sugar.
The social media trend of drinking 1–2 tablespoons of olive oil on an empty stomach first thing in the morning has some mechanistic plausibility but limited clinical evidence:
Proposed benefit: Stimulates bile flow, "flushes" the digestive system, provides a concentrated dose of polyphenols on an empty stomach for maximum absorption.
Actual benefit: The bile stimulation is real — consuming fat after an overnight fast does stimulate the gallbladder to release bile. However, the digestive system "flush" claim is not supported by evidence. The gut does not work that way.
Polyphenol absorption argument: Some proponents claim polyphenols absorb better on an empty stomach. There is limited evidence for this. Polyphenol absorption occurs primarily in the small intestine, and whether the stomach is empty or full probably does not significantly affect the efficiency of that process1.
Practical concern: Drinking olive oil on an empty stomach can cause digestive discomfort in some people — particularly those with gallbladder issues or sensitive digestion. The "shot" trend is not universally well-tolerated.
In actual Mediterranean populations — where olive oil consumption is highest and the associated health benefits are most documented — olive oil is consumed throughout the day, with meals:
- Morning: possibly with bread, in some regional traditions
- Midday: with salad, vegetables, bread
- Evening: with the main meal, which typically includes cooked vegetables, protein, and starches
The idea of a specific "olive oil time" is not part of the Mediterranean dietary tradition. The tradition is simply: use olive oil at most meals, generously.
For most people, consuming olive oil with meals is the better choice — whether that meal is breakfast, lunch, or dinner. Reasons:
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Palatability: Olive oil consumed on an empty stomach is not pleasant for most people. Consuming it with food makes the practice more sustainable.
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Digestive tolerance: The fat stimulating bile release alongside food is more physiologically normal than on an empty stomach.
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Glycemic benefit: If you eat carbohydrates, consuming olive oil with them reduces the glycemic response. This benefit is only relevant when you eat carbs — which for most people is at meals.
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Polyphenol absorption: The evidence for enhanced polyphenol absorption from empty-stomach consumption is weak1.
The one exception: some people with specific digestive conditions (bile acid malabsorption, very sluggish bile flow) may benefit from morning fat consumption to stimulate bile production. This is a specific medical situation, not a general recommendation.
The most important factor in olive oil benefit is consuming good quality extra virgin olive oil consistently — not the specific time of day. A daily tablespoon of high-phenol EVOO consumed with meals provides meaningful health benefits. A "superfood shot" of commodity olive oil consumed on an empty stomach before breakfast provides minimal benefit.
If you already use olive oil generously in cooking and dressings, you probably don't need to add a morning shot. If you don't currently use olive oil much, start using it in cooking before worrying about timing.
Drinking olive oil before bed is a traditional practice in some Mediterranean regions, particularly the Greek islands, where a tablespoon of high-phenol EVOO is consumed on an empty stomach before sleep. The proposed benefits include improved digestion, better bowel motility, and overnight polyphenol absorption when stomach acid is lower. There is no robust clinical trial evidence specifically comparing morning vs. evening consumption of olive oil. The most important factor is total daily intake of polyphenols, not the timing. For those who tolerate it, drinking 1–2 tablespoons of high-phenol EVOO before bed is a safe traditional practice.1
The traditional "daily shot" of olive oil is approximately 1–2 tablespoons (15–30ml). This is within the range used in Mediterranean diet interventions (50ml daily across multiple meals). Drinking more than 2–3 tablespoons at once may cause digestive discomfort in some people due to the fat content and oleocanthal's gastric stimulation. The practice is not necessary — spreading olive oil consumption across meals delivers the same total polyphenol intake with less digestive stress.1
Any food consumed in excess of caloric needs contributes to weight gain — olive oil at 120 calories per tablespoon is no exception. The Mediterranean diet studies did not show weight gain from the olive oil dose used (50ml daily) as part of a balanced dietary pattern. However, drinking olive oil as a supplement on top of a normal diet would contribute to caloric surplus. The key is incorporating olive oil as a dietary fat replacement (for butter, other oils) rather than as an addition to an already calorie-sufficient diet.1
1. USDA FoodData Central. "Oil, Olive, Extra Virgin." https://fdc.nal.usda.gov/fdc-app.html
References
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6770583/
- https://fdc.nal.usda.gov/fdc-app.html