The plant oils that you should avoid due to their high Omega-6 content include: Soybean oil. Canola oil. Corn oil. Safflower oil. Cottonseed oil. Sunflower oil. Peanut oil. Sesame oil. Rapeseed oil. Rice Bran oil. Also avoid all margarines and fake butters. | Saturated fats are best for cooking, because they are the most stable in high heat. These include butter, coconut oil, lard and tallow. Olive oil is also an excellent choice for cooking.