A low-carb diet means that you eat fewer carbohydrates and a higher proportion of fat. This can also be called a low-carb, high-fat diet (LCHF) or a keto diet. Not to be confused with the 'ol crazy artery-clogging Atkins diet. Now there's new science and even keto diets that are vegetarian based, imagine that! Like these smoothie recipes are! Not only are they vegetarian, but vegan too!