Keto diets include a large proportion of fat, so quality, composition, and balance are extremely important. The best practice is to use a combination of the following: animal fats; coconut oil; MCT oil or caprylic acid (C8); monounsaturated oils (olive, avocado); omega-3 oils (from ground flaxseed, chia, hemp hearts, fatty fish, fish oil); and omega-6s (limited amounts, preferably from nuts and seeds, not oils).