Keto Vegetarian Diet: The Ultimate Guide to the Ketogenic Vegetarian Diet for Permanent Weight Loss and Burn Fat; Includes 90 Easy Low-Carb Plant-Based Recipes and Two-Week Meal Plans, Beginner Friendly by Michelle Thomasson answers that question for you! That excess fat then gets stored and is a lot harder to burn. The idea revolves around the understanding that our bodies burn carbohydrates first as fuel source when we need energy.