The three healthiest oils for cooking are extra-virgin olive oil, canola oil and walnut oil, according to WebMD. These oils are polyunsaturated and monounsaturated fats instead of saturated fats, so they can help improve blood cholesterol levels and promote heart health.
Canola oil has a higher smoke point than olive oil, so it's an excellent choice for kitchen tasks that require high heat, such as frying or sauteing. When selecting olive oil, it's important to choose extra-virgin varieties to get maximum antioxidants. Walnut oil is a healthy choice because it contains a high level of heart-healthy Omega-3 fatty acids. It has a bold, nutty flavor and should be stored in the refrigerator and used within three months of purchase.