The Ketogenic Diet is a special high-fat diet that is used for difficult to treat seizures. Heavy cream, butter, plus, nut and olive oils, provide the necessary fat; the diet can also be done dairy-free. The diet also completely eliminates sweets such as candy, cookies, and desserts. Other carbohydrate rich foods such as bread, potatoes, rice, cereals, and pasta are not allowed on the strictest form of the diet (4:1 Classic ratio), but are allowed on more liberal forms of the diet. The Classic ketogenic diet requires that foods be carefully prepared and weighed on a gram scale. Each meal must be eaten in its entirety for the diet to be most effective. The Classic keto for epilepsy diet consists of a ratio in grams of fat to non-fat (protein and carbohydrates) of 4:1 and 3:1. The modified Ketogenic Diet consists of ratios of 2:1 and 1:1. Modified versions of the Classic diet allow more carbohydrate and require less fat.