What is the healthiest oil to cook with?

High-polyphenol extra virgin olive oil is widely considered the gold standard for healthy cooking. Unlike seed oils (canola, vegetable, sunflower), EVOO is predominantly monounsaturated fat, which is highly stable at heat and does not oxidise into harmful compounds. Kosterina Organic Everyday EVOO has 350+ mg/kg polyphenols and a smoke point above 425F -- delivering health benefits even when used for cooking.