A ketogenic diet can definitely be a amazing way to increase energy. With a ketogenic diet the majority of calories come from healthy fats. Many people assume that it's low in vegetables. That said, fats have much more calories then vegetables. In terms of calories you are getting most of you energy from fats but by volume it's mostly a plant based diet! When preparing a keto meal start with veggies then add the fat. About 75% of your plate should be plant based foods. So go ahead, eat all the colors of the rainbow and keep out the high glycemic vegetables. There are many awesome vegan recipes you can use to build your keto meals.