The ketogenic diet is a high-fat, adequate-protein, low-carbohydrate diet that in medicine is used primarily to treat difficult-to-control (refractory) epilepsy in children. The diet forces the body to burn fats rather than carbohydrates.
a diet based on the types of foods presumed to have been eaten by early humans, consisting chiefly of meat, fish, vegetables, and fruit, and excluding dairy or grain products and processed food.
"I've recently started the Paleo diet and have also given up caffeine"
That means veganism extends beyond the diet of a vegan individual. That is the biggest difference between vegans and vegetarians. While vegetarians may not consume animal products, they may use them if they are present in other products, such as items containing silk, honey or leather.