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Short Summary
Main recommendation: For deep frying, choose healthy fats with high smoke points, such as avocado oil or coconut oil, and avoid hydrogenated or partially hydrogenated oils. Heating a fat past its smoke point denatures it, and oxidation from reacting with oxygen also turns a good fat into a bad one. Dr. Zyrowski notes that many online recommendations promote high-smoke-point oils that are actually hydrogenated or partially hydrogenated.
Key Points
- Oils can go from good to bad in two ways: exceeding their smoke point (denaturing) and reacting with oxygen (oxidation).
- Restaurant and fast-food frying is typically done with hydrogenated or partially hydrogenated oils, or with oils not designed for high heat.
- Many online "health guru" lists recommend high-smoke-point oils that are hydrogenated or partially hydrogenated, which the speaker identifies as a source of misinformation.
- Avocado oil (smoke point 500°F) is the top pick, but it is expensive for large volumes; coconut oil (450°F) is a more affordable alternative.
- Butter (350°F) is not good for deep frying but fine for baking or low-heat cooking; extra virgin olive oil (420°F) requires lower heat than refined olive oil.
Details Worth Noting
- Concrete instructions: Choose healthy fats first, then select those with high smoke points for deep frying. Use avocado oil or coconut oil for deep frying, such as chicken or sweet potato fries. Use ghee (485°F) for sautéing or pan frying, since it is costly for deep frying. Use refined olive oil (468°F) rather than extra virgin (420°F) for higher heat, and use lower heat with extra virgin olive oil. Use butter only for baking, eggs, or low-heat sautéing. As a rule of thumb, if butter browns and smokes, stop, because it has become unhealthy.
- Olive oil has a strong flavor that carries into whatever you fry, which some cooks dislike.
- Coconut oil has a slightly lower smoke point, so avoid heating it too high.
- Smoke points cited: avocado 500°F, coconut 450°F, ghee 485°F, refined olive 468°F, extra virgin olive 420°F, butter 350°F.
Bottom Line
Match the oil to the cooking temperature: avocado or coconut for deep frying, ghee or refined olive oil for hotter pan work, and butter or extra virgin olive oil for gentle cooking, while avoiding hydrogenated oils.
