Most kitchens accumulate cooking oils by habit rather than design. Research from the PREDIMED trial shows extra virgin olive oil—rich in monounsaturated fat and polyphenols—is associated with cardiovascular benefits. It should be your default, with avocado oil for high heat. Seed oils deserve caution; old rancid bottles should go.
This companion covers why cooking oil matters, the oil hierarchy, conducting the audit, the upgrade path, and proper storage to prevent degradation. (3 min read)