Many ingredients suggested for smoothies, like fruits (banana and pineapple), have a high glycemic index. This means they will spike your blood sugar and insulin levels almost immediately. This is the exact opposite of what you are striving for on a low-carb diet. The best way to reduce this effect is to add a mixture of protein, fiber, and fat to the green smoothie. The combination of protein powder and the healthy fats in avocados makes this green smoothie recipe low carb and easy on your blood sugar. But if you want you can always add some berries in your smoothies. This low carb raspberry smoothie is AMAZING! In addition, I prefer coconut milk in my smoothies. Not only does it create the creamiest smoothie ever, but it adds more healthy fats and is very low in carbs. And less but not least, you can add some keto chocolate in your smoothies too. It's so good. Take a look at these Keto Chocolate Smoothie and Keto Avocado Green Smoothie I made few weeks ago.