When you heat olive oil really hot (200°C), the good antioxidants called tocopherols disappear—some oils lose them completely, while others like Picual and Cornicabra keep a little bit left.
Scientific Claim
Heating extra virgin olive oils at 200 °C in a thin layer causes complete degradation of α-tocopherol in all varieties tested, with Picual and Cornicabra oils retaining 22–24% of total tocopherols, while Arbequina and Armonia oils lose nearly all tocopherols, indicating that thermal stability of antioxidants varies significantly by olive variety and heating temperature.
Original Statement
“At 200 °C, complete degradation of tocopherols was observed regardless of the type of olive oil. The least stable tocopherol was α-tocopherol. At 170 °C, its complete degradation was observed in Arbequina and Armonia olive oils... In the other two samples, Cornicabra and Picual, losses were lower at 77.8% and 78.5%, respectively... After heating at 200 °C, complete degradation of tocopherols was observed in all samples.”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The study used controlled in vitro heating with precise temperature control and quantitative HPLC measurements of tocopherol content before and after heating, allowing definitive statements about chemical degradation under these specific conditions.
Evidence from Studies
Supporting (1)
Scientists heated different types of olive oil at a high temperature and found that some kinds, like Picual and Cornicabra, kept more of their healthy antioxidants than others, like Arbequina — just like the claim said.