For most people, cooking eggs in oil is the healthier choice. Plant-based oils like olive oil, avocado oil, and canola oil contain far more unsaturated fat and far less saturated fat than butter, and swapping butter for these oils is linked to meaningful reductions in cardiovascular disease risk. That said, the difference from a single tablespoon of cooking fat is small. What matters more is the pattern you follow most mornings.
How Butter and Cooking Oils Compare
The core difference comes down to fat composition. About 68% of butter’s fat is saturated, with roughly 28% monounsaturated and just 4% polyunsaturated. Compare that to olive oil, which is about 14% saturated and 75% monounsaturated, or avocado oil at 12% saturated and 74% monounsaturated. Canola oil tips even further toward unsaturated fat, at around 7% saturated with 64% monounsaturated and 28% polyunsaturated.
In practical terms, a tablespoon of butter delivers roughly 7 grams of saturated fat. The same amount of olive oil gives you about 2 grams. U.S. dietary guidelines recommend keeping saturated fat below 10% of daily calories, which works out to about 20 grams on a 2,000-calorie diet. One tablespoon of butter takes up more than a third of that budget before you’ve eaten anything else. More than 80% of Americans already exceed this daily limit.
What the Heart Health Data Shows
A large study on butter and plant oil intake found that replacing just 10 grams of daily butter (a little over two teaspoons) with an equivalent amount of plant-based oil was associated with a 17% reduction in overall mortality and a 17% reduction in cancer mortality. Separately, every 10-gram increase in daily plant oil intake was linked to a 6% lower risk of dying from cardiovascular disease. These aren’t small numbers, and they reflect the cumulative effect of choosing unsaturated fats over saturated ones day after day.
This doesn’t mean butter is dangerous in isolation. It means that when you consistently choose plant oils over butter, your long-term cardiovascular risk profile improves. If you cook eggs every morning, that’s a meaningful place to make the switch.
Does Cooking Method Affect Safety?
One common concern is that heating oils produces harmful oxidation byproducts like peroxides and aldehydes. This is a real phenomenon in deep frying, where oils sit at high temperatures for hours. But frying or scrambling an egg is a quick, relatively low-temperature process. Research examining fried and scrambled eggs prepared in different fats found that rapidly cooking eggs was unable to cause significant degradation or oxidation of the lipids. In other words, the brief cook time of an egg doesn’t push any common cooking fat into dangerous territory.
Smoke point still matters for comfort and flavor, though. Butter starts to smoke at around 302°F (150°C), which is easy to hit on a medium-high burner. Extra virgin olive oil smokes at about 374°F (190°C), and canola oil holds up to 428–446°F (220–230°C). For eggs, you rarely need extreme heat, so olive oil and avocado oil work perfectly well. If you like the browning and flavor of butter but want to raise the smoke point, mixing a small amount of butter into a base of olive oil is a common approach.
Calories Are Essentially the Same
If your main concern is weight, switching from butter to oil won’t save you calories. Both butter and oil run about 100–120 calories per tablespoon. The amount of fat your egg absorbs during cooking also depends more on how much fat you use in the pan than on which fat you choose. Using a nonstick pan with a light coating of oil spray is the lowest-calorie option if that’s your priority.
Which Oil Works Best for Eggs
Olive oil and avocado oil are the strongest all-around choices. Both are dominated by monounsaturated fat, handle egg-frying temperatures comfortably, and have mild enough flavors for breakfast. Olive oil adds a slightly fruity note that pairs well with scrambled eggs and vegetables. Avocado oil is more neutral and works better if you want the egg’s flavor to come through on its own.
Canola oil is another solid option with the lowest saturated fat content of common cooking oils and a high smoke point. It has a very neutral taste, which some people prefer and others find bland. Coconut oil, despite its popularity, is over 91% saturated fat and offers no cardiovascular advantage over butter.
If butter is what makes you enjoy your eggs, using a small amount occasionally isn’t going to derail your health. The goal isn’t perfection at every meal. It’s shifting your default cooking fat toward oils that are mostly unsaturated, especially if eggs are part of your daily routine.