>To force your body into a purely ketone metabolism, you'd need to restrict not just carbohydrates but also protein. If a person is eating a high-fat, high-prot

>To force your body into a purely ketone metabolism, you'd need to restrict not just carbohydrates but also protein. If a person is eating a high-fat, high-protein diet, their body will make glucose/glycogen from that. That is expected and fine. It wont make glucose/glycogen in the same way/manner it would do from carbs though, and it's not really a problem for getting into ketosis and staying there (as shown by ketone measurements). That professor was making a pedantic argument it seems.