Soybean oil is one of the better cooking oils for cholesterol. It’s rich in polyunsaturated fats, which lower LDL (“bad”) cholesterol when they replace saturated fats in your diet. The American Heart Association includes soybean oil on its list of heart-healthy cooking oils alongside canola, corn, olive, and sunflower oils.
What Makes Soybean Oil Heart-Friendly
Soybean oil’s fat profile tells most of the story. Per 100 grams, it contains about 58 grams of polyunsaturated fat, 23 grams of monounsaturated fat, and only 16 grams of saturated fat. The dominant fatty acid is linoleic acid (an omega-6 fat), making up 48% to 58% of the oil. It also contains 4% to 11% alpha-linolenic acid, a plant-based omega-3. That combination of high polyunsaturated fat and low saturated fat is exactly what moves cholesterol numbers in the right direction.
Polyunsaturated fats help your liver clear LDL cholesterol from the bloodstream more efficiently. The key isn’t adding soybean oil on top of what you already eat. It’s using it in place of saturated fat sources like butter, lard, or coconut oil. That swap is what produces measurable cholesterol improvements.
What the Clinical Trials Show
In a randomized controlled trial comparing soybean oil to a palm oil blend (a high-saturated-fat combination), soybean oil reduced LDL cholesterol by 11%, total cholesterol by 10%, and the number of LDL particles by 10%. Small, dense LDL particles, the type most strongly linked to artery damage, dropped by 28%. These are meaningful reductions from a single dietary change.
The same trial tested a high-oleic version of soybean oil (a newer variety bred to contain more monounsaturated fat) and found it raised LDL by about 4% compared to conventional soybean oil. So if you’re choosing soybean oil specifically for cholesterol, the standard version outperforms the high-oleic variety.
How It Compares to Olive Oil
A large network meta-analysis that pooled data across many trials found virtually no difference between soybean oil and olive oil for LDL cholesterol. The estimated difference was 0.01 mmol/L, which is clinically meaningless. For total cholesterol, the gap was similarly tiny. Both oils are effective at lowering cholesterol compared to saturated fat sources, and neither has a clear advantage over the other in clinical data.
This is worth knowing because olive oil tends to get positioned as the gold standard for heart health, while soybean oil often gets dismissed as a cheap industrial product. The cholesterol data doesn’t support that hierarchy. If soybean oil fits your budget and cooking style, it performs comparably to olive oil on lipid markers. The broader analysis actually noted that omega-6-rich plant oils like soybean oil were slightly more effective at reducing LDL and total cholesterol than olive oil, though the differences were small.
The Omega-6 Inflammation Concern
You’ve likely seen claims that soybean oil causes inflammation because of its high omega-6 content. This is one of the most persistent nutrition myths online, and recent clinical evidence directly contradicts it. A controlled crossover trial had adults with overweight or obesity consume 30 grams of soybean oil daily for four weeks. Researchers measured C-reactive protein (a standard inflammation marker), oxidized LDL, and several other inflammatory markers. None of them increased.
If anything, the soybean oil group showed a trend toward lower levels of interleukin-6, a marker tied to chronic inflammation. The researchers noted this was consistent with earlier findings linking higher linoleic acid levels in the body to lower inflammation. The bottom line: eating soybean oil does not appear to promote inflammation or LDL oxidation in humans, despite what social media claims suggest.
Fresh Oil vs. Repeatedly Heated Oil
There is one important caveat. Soybean oil’s cholesterol benefits depend on the oil being in good condition. Animal research has shown that repeatedly heating soybean oil, the kind of reuse common in deep fryers, significantly increases LDL levels and markers of oxidative damage. Fresh soybean oil in the same study actually reduced homocysteine, an amino acid linked to heart disease risk. But that protective effect disappeared completely once the oil was reheated multiple times.
Refined soybean oil has a smoke point of about 450°F (232°C), which is high enough for most home cooking methods including stir-frying and sautéing. The practical takeaway: use fresh oil each time you cook, avoid reusing frying oil, and don’t push the temperature close to the smoke point for extended periods. These habits preserve the fatty acid profile that makes the oil beneficial in the first place.
How to Get the Most Cholesterol Benefit
Soybean oil works best as a replacement, not an addition. Drizzling it over food you’re already cooking in butter won’t help. Instead, swap it in wherever you currently use a saturated fat source. Use it for roasting vegetables, making salad dressings, or as your default pan oil. Because it has a neutral flavor, it works in almost any dish without competing with other ingredients.
The amount matters less than the substitution. Clinical trials showing cholesterol improvements typically use soybean oil as the primary fat source in the diet, replacing 7% to 10% of total calories that would otherwise come from saturated fat. For most people, that translates to about two to three tablespoons per day as your main cooking and dressing oil. You don’t need to measure precisely. Simply making soybean oil your go-to kitchen oil and reducing butter, cream, and coconut oil will shift the ratio in the right direction over time.