A pantry staple with a golden reputation, but even this one has a catch or two.
Olive oil sits on a pedestal in most kitchens and bathroom shelves, and for good reason. It’s rich in monounsaturated fat, packed with antioxidants, and it’s a cornerstone of some of the healthiest eating patterns on the planet. Still, every ingredient has a flip side, and olive oil is no exception. Used carelessly or in large amounts, it can cause reactions you probably weren’t expecting.
None of this means you should toss the bottle. It means understanding where olive oil earns its glowing reputation and where it quietly works against you, especially on skin, and around certain medications or health conditions. If you’re curious about how small food choices ripple through your body, you might also like this look at what actually happens when you start eating healthy.
Key Takeaways
– Heavy topical use can clog pores and trigger acne, blackheads, and rashes, especially on oily skin.
– Some people have genuine allergic reactions, from contact dermatitis to digestive upset.
– Its calorie and saturated fat content can add up fast and contribute to weight gain.
– It may lower blood sugar and blood pressure, which matters if you take medication for either.
– Olive oil can interact with blood thinners and may reduce their effectiveness.
Can Olive Oil Really Cause Acne?
SaveOlive oil is heavy. It doesn’t sink into skin quickly, so it tends to sit on the surface and form a thick film that blocks pores. According to Jesse Feder, a clinical dietitian at Memorial Regional Hospital South, olive oil does contain vitamin E, antioxidants, and healthy fats that can protect and moisturize skin, but too much of it can clog pores and lead to breakouts. His advice is to keep any application to a thin layer.
That film also acts a bit like flypaper for dirt, dust, and your own sebum. Trap all of that against your face and you’ve set the stage for pimples and blackheads. If you use olive oil on your skin at all, twice a week is plenty. Oily skin types are better off skipping it entirely.
Allergies and Skin Reactions
Some people react to olive oil, and the reaction can be more than mild. Contact dermatitis, eczema flare-ups, and respiratory symptoms have all been linked to it, usually after topical use. A case report in the Journal of the American Academy of Dermatology described a masseur who developed hand eczema from repeated olive oil exposure. Patch and use tests came back positive, though an oral test did not, which suggests the risk climbs with prolonged skin contact, as in massage work.
Food reactions happen too. One lifestyle blogger, Glenda Chung Hinchey, wrote that even a tablespoon sends her running to the bathroom, and she mentioned a friend who vomits after eating it. Reactions like these are rare, but if you notice symptoms, see a doctor rather than waiting it out.
Oily skin makes rashes more likely. When olive oil layers over skin that’s already producing excess sebum, the result can be irritation, redness, and inflammation.
A Note on Babies and Dry Skin
Newborn skin is delicate, and you often can’t tell whether an infant is sensitive to olive oil until a rash appears. Coconut oil is a gentler choice for baby massage. If you do use olive oil, stick to a good extra virgin grade.
Dry skin is another poor match. Research points to oleic acid, one of olive oil’s main components, as a culprit that weakens the skin’s own moisture barrier. A randomized controlled trial in Pediatric Dermatology had 19 adults apply olive oil to one forearm and sunflower seed oil to the other over four to five weeks. Olive oil reduced the integrity of the outer skin layer and caused mild redness, regardless of whether volunteers had a history of eczema. Sunflower seed oil, by contrast, preserved the barrier and improved hydration. The takeaway from that study was to avoid olive oil on dry or eczema-prone skin.
The Calorie Question
SaveHere’s the part that surprises people who think of olive oil as purely virtuous. Every tablespoon carries roughly 120 calories and about 14% saturated fat. That’s a dense package, and it slips into meals easily, a generous drizzle here, a splash for sautéing there. Over time, regular heavy use can nudge the scale upward and, alongside other saturated fat, feed into risks like atherosclerosis, heart disease, and certain cancers.
If you’re watching your intake, measuring oil with a spoon instead of free-pouring makes a real difference. It pairs well with the mindset behind a calorie deficit that doesn’t wreck your energy or the flexible approach in this 7-day vegetarian weight loss plan.
There’s also the matter of processing. Light and refined olive oils are often treated under high heat and pressure, which can alter the oil’s structure and degrade its beneficial omega-3 fats. Cheaper, heavily processed versions lose much of what makes olive oil worth choosing in the first place.
Blood Sugar, Blood Pressure, and Medications
Olive oil can lower blood glucose, which sounds helpful and often is. But if you already take medication to manage diabetes, the combined effect could push your levels too low. The same caution applies to blood pressure. Olive oil may reduce it, and in people already on antihypertensive drugs, an excessive drop can cause dizziness or fainting, and in extreme cases has been linked to more serious outcomes.
The bigger flag is blood thinners. Olive oil may interact with anticoagulant medications and blunt how well they work. If you’re on one, it’s worth a conversation with your doctor before making olive oil a daily fixture.
Digestive Discomfort
Too much olive oil can loosen things up considerably. Some people experience diarrhea, stomach pain, or general abdominal discomfort after a large dose, since fat in quantity can speed up the gut. There’s also a concern for anyone prone to gallbladder issues, as high-fat intake can contribute to gallstones or blockages. If your stomach tends to be temperamental, this guide to calming diarrhea at home may come in handy.
Frequently Asked Questions
Is extra virgin olive oil safer than the refined kind?
Extra virgin is the least processed and retains the most nutrients and antioxidants. Refined and light versions go through high heat that degrades some of the healthy fats, so extra virgin is the better pick, though the calorie and allergy concerns still apply.
How much olive oil is too much in a day?
There’s no single cutoff, but because each tablespoon runs about 120 calories, it adds up quickly. Most people do fine with one to two tablespoons daily as part of balanced meals. More than that, and the calories and fat can outweigh the benefits.
Can I use olive oil on my face if I have oily skin?
It’s best avoided. Olive oil is naturally sticky and slow to absorb, so on already-oily skin it tends to clog pores and encourage acne, blackheads, and rashes rather than help.
The Bottom Line
Olive oil deserves its healthy reputation, but reputation isn’t a free pass. Slathered on in excess, it clogs pores and irritates sensitive or dry skin. Poured with a heavy hand, its calories and saturated fat add up. And for anyone managing blood sugar, blood pressure, or taking blood thinners, the interactions are real enough to warrant caution. Use it thoughtfully, keep an eye out for reactions, and it stays the ally it’s meant to be.
This article is for informational purposes only and is not a substitute for professional medical advice. If you experience symptoms such as stomach pain, nausea, or vomiting, or take medication for blood pressure, blood sugar, or clotting, consult your doctor before adding olive oil to your routine.
Related Articles
What Actually Happens When You Start Eating Healthy
How to Set Up a Calorie Deficit Without Wrecking Your Energy
A 7-Day Vegetarian Meal Plan That Makes Weight Loss Feel Easy
How to Calm Diarrhea at Home With Things You Probably Already Have
References
1. Journal of the American Academy of Dermatology — case report on occupational allergic contact dermatitis from olive oil in a masseur.
2. Pediatric Dermatology — randomized controlled trial on the effects of olive oil and sunflower seed oil on the skin barrier.