The OG plan relies on a finely calibrated equation of carbs, fat, and protein in order to generate ketones. If you start messing with the math, it’s pretty easy to boot yourself out of ketosis. Cutting almost all carbs from your diet can cause glucose—a.k.a. For a person without diabetes this doesn’t pose a danger. And for someone with diagnosed diabetes who is monitoring blood sugar levels and using the keto diet along with medical supervision to reduce the need for insulin medication, it may even be desired.