Neither peanut oil nor olive oil is universally “better.” Each one wins in different categories. Olive oil offers more health-protective compounds and a stronger nutritional profile overall, while peanut oil handles high heat better and works well for frying. The right choice depends on what you’re cooking and what matters most to you.
Fat Profiles Are Similar but Not Identical
Both oils are high in monounsaturated fat, specifically oleic acid, which is the type most strongly linked to heart health. The FDA has recognized that consuming about 1.5 tablespoons (20 grams) per day of oils high in oleic acid, when used to replace saturated fats like butter or coconut oil, may reduce the risk of coronary heart disease. Both peanut and olive oil qualify here.
The difference is in the details. Olive oil, particularly extra virgin, contains a higher proportion of monounsaturated fat relative to polyunsaturated fat. Peanut oil has a bit more polyunsaturated fat, which isn’t harmful but is slightly less stable when exposed to heat and light over time. For everyday heart health, both are solid choices, but olive oil has a small edge in fat composition.
Olive Oil Has More Protective Compounds
This is where the gap widens. Extra virgin olive oil contains a suite of polyphenols that peanut oil simply doesn’t match. Three stand out in particular. Hydroxytyrosol is one of the most potent antioxidants found in any food and may help reduce the risk of developing type 2 diabetes. Oleuropein has been shown to fight various bacteria and viruses. Oleocanthal has anti-inflammatory effects similar to ibuprofen, which may help lower the severity of chronic inflammatory diseases.
Peanut oil does contain vitamin E, and so does olive oil. But olive oil layers additional vitamins, antioxidants, and polyphenols on top of that. The result is a more well-rounded nutritional package. If your goal is to get the most health benefit from your cooking oil, olive oil delivers more per tablespoon.
Peanut Oil Wins for High-Heat Cooking
Refined peanut oil has a smoke point of 450°F (232°C), while extra virgin olive oil sits around 374°F (190°C). That 76-degree gap matters when you’re deep-frying, stir-frying, or searing at high temperatures. Once an oil passes its smoke point, it breaks down, produces off flavors, and releases compounds you don’t want to breathe or eat.
For deep-frying chicken, making stir-fry in a screaming-hot wok, or searing a steak, peanut oil is the more practical choice. Its neutral flavor also means it won’t compete with the taste of your food. Extra virgin olive oil, by contrast, has a grassy, peppery flavor that works beautifully in salad dressings, pasta finishes, and medium-heat sautéing but can taste out of place in a basket of fried food.
If you want the best of both worlds, keep both in your kitchen. Use peanut oil when you need high heat and a clean flavor, and reach for olive oil for everything else.
Processing Makes a Big Difference
Most peanut oil on grocery shelves is heavily refined, meaning it’s been treated with chemicals and heat to produce a light-colored, neutral-flavored product. That refining process strips out many of the nutrients and antioxidants that were present in the raw peanut. Cold-pressed peanut oil exists but is uncommon and has a stronger nutty flavor.
Extra virgin olive oil, on the other hand, is mechanically pressed without heat or chemical treatment. This preserves its full range of polyphenols, vitamins, and flavor compounds. The fact that the most widely available form of olive oil is also its least processed form gives it a meaningful nutritional advantage over the most widely available form of peanut oil.
What Heart Health Guidelines Say
The American Heart Association’s 2026 dietary guidance recommends “liquid nontropical plant oils” as part of a heart-healthy eating pattern, specifically naming soybean, canola, and olive oils. Peanut oil isn’t excluded from this category, but it also isn’t highlighted the way olive oil is. This likely reflects olive oil’s deeper evidence base, driven in large part by decades of research on Mediterranean-style diets.
Both oils are far better choices than butter, lard, or tropical oils like coconut and palm oil, which are high in saturated fat. Swapping any of those for either peanut or olive oil is a clear upgrade for cardiovascular health.
Peanut Oil and Allergy Concerns
If you or someone you cook for has a peanut allergy, this matters. Highly refined peanut oil contains only trace amounts of peanut protein. In a clinical study of 62 peanut-allergic patients, none reacted to refined peanut oil, though six had mostly mild reactions to crude (unrefined) peanut oil. Risk assessments predict that even in worst-case scenarios, the health risk from residual proteins in refined peanut oil is negligible, ranging from 0.4% down to 0.0% depending on the model used.
That said, cold-pressed or unrefined peanut oil retains more protein and poses a real risk. If allergies are a concern, refined peanut oil is generally considered safe, but olive oil eliminates the question entirely.
Which One Should You Use
For overall health benefits, olive oil is the stronger choice. Its polyphenol content, minimal processing, and robust research backing give it advantages that peanut oil can’t match. Use extra virgin olive oil as your default for salad dressings, roasting vegetables, sautéing, and finishing dishes.
For deep-frying, high-heat stir-frying, or any recipe where you need a neutral-tasting oil that can handle intense temperatures, peanut oil is the better tool. It’s not unhealthy by any means. It’s just more of a cooking workhorse than a nutritional powerhouse. Keeping both on hand lets you match the oil to the job.