Olive oil edges out peanut oil as the healthier choice overall, primarily because of its unique mix of anti-inflammatory compounds that peanut oil lacks. Both oils share a similar fat profile built around heart-healthy monounsaturated fats, but olive oil’s advantages go beyond its fatty acids. That said, peanut oil has real strengths of its own, especially in the kitchen.
Fat Profiles Are Closer Than You’d Think
Peanut oil and olive oil are both dominated by monounsaturated fatty acids (MUFAs), the same type of fat that makes avocados and nuts good for your heart. High-oleic peanut oil, which is increasingly common, can deliver up to 80% of its fat as monounsaturated, matching or even slightly exceeding olive oil. Both oils contain modest amounts of polyunsaturated fat and relatively low levels of saturated fat.
This similarity matters because monounsaturated fats are the primary reason both oils lower LDL (“bad”) cholesterol without dragging down HDL (“good”) cholesterol. In animal studies, peanut oil significantly reduced total cholesterol and non-HDL cholesterol compared to control diets over a 24-week period, while keeping HDL intact. Olive oil has shown the same pattern in decades of research. If you’re comparing the two purely on their fat composition, they’re roughly equivalent.
Where Olive Oil Pulls Ahead
The real gap between these oils isn’t in their fats. It’s in the smaller compounds that come along for the ride. Extra virgin olive oil contains roughly 36 different phenolic compounds, and these are responsible for a significant share of its health benefits. The most studied of these, oleocanthal, works like a natural anti-inflammatory. It inhibits the same pain and inflammation pathways that ibuprofen targets, and in lab comparisons at equal concentrations, oleocanthal blocked 41% to 57% of inflammatory enzyme activity compared to ibuprofen’s 13% to 18%.
These polyphenols also appear to drive olive oil’s impressive cardiovascular track record. A large meta-analysis of prospective studies found that higher olive oil consumption reduced the risk of cardiovascular disease by 15% and all-cause mortality by 17% compared to lower consumption. Even modest increases help: every additional 5 grams of olive oil per day (about a teaspoon) was associated with a 4% reduction in both cardiovascular disease risk and overall mortality. The landmark PREDIMED trial found that a Mediterranean diet supplemented with extra virgin olive oil lowered total cardiovascular disease risk by 31% compared to a control diet.
Peanut oil contains some beneficial plant compounds, including phytosterols and vitamin E, but it simply doesn’t have the same concentration or variety of polyphenols that make olive oil distinctive. Peanut oil is a reasonable source of vitamin E, though it falls short of the richest sources like sunflower and wheat germ oils.
Peanut Oil’s Advantage: High-Heat Cooking
Peanut oil has one clear practical advantage. Its smoke point sits around 226 to 230°C (about 440 to 450°F), well above the temperatures needed for deep frying. This is why it’s the go-to oil for frying turkeys, stir-frying, and other high-heat methods. It also has a neutral flavor when refined, so it won’t compete with the taste of your food.
Extra virgin olive oil has a smoke point in the range of 190 to 207°C (374 to 405°F). That’s perfectly fine for sautéing, roasting, and most everyday cooking, but it’s less ideal for sustained deep frying. Refined (non-virgin) olive oil has a higher smoke point closer to peanut oil’s range, though it loses many of the polyphenols in the refining process.
Both oils hold up reasonably well against oxidation during storage. Peanut oil maintained good stability for months in Rancimat testing, with its induction time declining by about 26% over a full year of storage. Polyunsaturated fats are the most vulnerable to breaking down during cooking and storage, and since both oils are relatively low in polyunsaturated fat, neither is especially prone to rancidity compared to oils like corn or soybean.
Refined vs. Unrefined Changes the Equation
How each oil is processed makes a big difference in what you actually get. Extra virgin olive oil is mechanically pressed without heat or chemicals, preserving its full complement of polyphenols and flavor. Refined olive oil (often labeled “light” or simply “olive oil”) loses most of those protective compounds.
The same applies to peanut oil. Cold-pressed peanut oil retains more of its natural flavor and nutrients, including vitamin E and phytosterols. Refined peanut oil, the type most commonly sold for cooking, has been bleached and deodorized. One upside of that refining: it removes the proteins that trigger peanut allergies, making refined peanut oil generally safe for people with peanut allergies (though cold-pressed or gourmet varieties are not).
If you’re choosing between refined peanut oil and extra virgin olive oil, the olive oil wins on nutrition by a wide margin. If you’re comparing both in their refined forms, the gap narrows considerably, since refined olive oil has lost much of what made it special in the first place.
Blood Sugar and Metabolic Health
Both oils show promise for blood sugar management, largely because of their high oleic acid content. Oleic acid has been linked to improved insulin sensitivity and lower blood glucose levels, likely through its effects on fat metabolism and inflammation. Early lab research on peanut oil found it can inhibit one of the key digestive enzymes involved in breaking down starches, which could theoretically slow the rise in blood sugar after a meal. Peanut extracts have also lowered fasting blood sugar and long-term glucose markers in diabetic animal models.
Olive oil’s effects on blood sugar are better documented in humans, largely because it has been studied more extensively as part of Mediterranean diet trials. But neither oil is a treatment for diabetes on its own. The metabolic benefits of both come from replacing less healthy fats (like butter or highly processed seed oils) with monounsaturated-rich options.
Which Oil Should You Use
For everyday cooking, salad dressings, and drizzling, extra virgin olive oil is the stronger choice. Its polyphenols offer anti-inflammatory and cardiovascular benefits that peanut oil can’t match, and it handles normal cooking temperatures without issue. For deep frying, wok cooking, or recipes where you need a neutral flavor and very high heat, peanut oil is a solid option that still provides a healthy fat profile. Using both in your kitchen, each for what it does best, is a perfectly reasonable approach.