Keto? There is no better icon for the ketogenic diet than and avocado. For those unfamiliar with the diet, the basic principle is that you stick rigidly to a diet where you keep carbohydrate intake low enough that your body goes into a state called nutritional ketosis. (The reason why the humble avocado is such an icon of the diet is that it represents a highly nutritional food which meets the macros of the diet being relatively high in fat and very low in carbohydrates.