Classical ketogenic diets (e.g., 4:1 ratio) are 90% fat and used for pediatric epilepsy, while modified versions like modified Atkins or low glycemic index therapy are more liberal (e.g., 1:1 ratio) and can produce a mild state of ketosis suitable for lifestyle.

“But there are variations of the diet from a four to one, which is a classical ketogenic diet, which is 90% fat and one part protein and carbohydrates. And then, all the way on the other end of the spectrum, there's the modified ketogenic diet or modified Atkins, or low glycemic index therapy or LGIT. And that's more of a one-to-one ketogenic diet. It's personally kind of what I follow, and I think you can construct the diet in a way that produces a mild state of ketosis. I think that could be a good lifestyle diet, but it's far different than the classical ketogenic diet, which was used for pediatric epilepsy.”