The goal of a keto diet is to keep your daily carbohydrate intake low enough that your body enters the metabolic state of ketosis. For most people, this is around 20 grams of net carbs per day. Just about anything can fit into a low carb or keto diet in the right portion. This recipe uses just a tablespoon of banana which has about 3 grams of net carbs, which can easily fit into a keto diet. But still, if you don't want to use a real banana, I have listed an alternative above.