I recently stumbled across an egg white protein powder that contained plain sugar. At first, I didn't understand why any manufacturer would add sugar to protein powder and I immediately rejected the idea of making it part of my exercise routine.However, research shows that exercise leaves the muscles craving carbs to restore what they lost from their local glycogen stores. They do this by becoming more sensitive to insulin, and also taking in glucose independently of insulin.As a result, I encourage you to experiment with protein shakes and fast carbs (i.e. fruit) after intense workouts. If it doesn't kick you out of ketosis, there's no reason why you shouldn't have a post-workout shake with some carbs.